tag:blogger.com,1999:blog-43597186312061859482024-03-12T19:31:00.369-07:00HPI SAVAGE XL OCTANEUnknownnoreply@blogger.comBlogger2125tag:blogger.com,1999:blog-4359718631206185948.post-66526161698759332512015-12-04T13:40:00.001-08:002015-12-04T13:47:29.414-08:00BATTERY BASICS <span style="color: black;">I don't believe in reinventing the wheel, and the same goes with R/C
battery information! I use NoBS Batteries exclusively in my R/C Flight
School application. With the introduction of Spektrum 2.4 radios, it is
imperative that one choose the proper battery application for your plane!
Therefore with permission of Hangtime Hobbies, the following page is presented
for your information. </span><br />
<div align="center">
<span style="color: #00cc00; font-family: "impact" , "arial" , sans-serif; font-size: x-large;">
<i><span style="color: black;">NoBS Batteries<br />
</span>
</i></span><i>
<span style="color: black; font-family: "impact" , "arial" , sans-serif; font-size: medium;">No Bull..
Just Great Batteries!</span></i></div>
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<span style="color: black; font-family: "arial" , "helvetica" , sans-serif; font-size: x-small;"> <b><i>Q:
What's the big deal about 'Impedance'? What is it and what does it do?</i></b></span></div>
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<span style="font-family: "arial" , "helvetica" , sans-serif; font-size: x-small;">A: Most folks react to the
'capacity' rating alone as being the biggest part of their decision in selecting
a pack for their big aggressive birds. This can lead to big trouble on board the
aircraft. Just as cells are evaluated for capacity, in high load applications
you need to take into consideration what the cells voltage performance will be
when loads are applied. All battery technologies react to servo loads with a
voltage drop while the load is applied. It's really very simple.. the higher the
cells impedance rating, the greater the voltage drop will be while servo loads
are applied. Rule of Thumb for cell selection: Impedance Ratings are like a Golf
Score. The lower, the better. Aircraft in aggressive aerobatic environments
employing digital or high torque servos should carry a cell impedance score of
10 mOhms or less. As an example, one of the most popular lightweight packs used
in IMAC aircraft is the Sanyo HR 2700AUX.. plenty of capacity, but the impedance
rate on the cell is 20 mOhms. Pretty high.. but if it's used in parallel with
another 2700 pack the impedance rate is cut in half to 10 mOhms (and the
available capacity is doubled). This is why you usually see this pack employed
in parallel in IMAC birds and used without issues as a single pack in a giant
Cub</span>.</span></div>
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<span style="color: black; font-family: "arial" , "helvetica" , sans-serif; font-size: x-small;"><b><i>Q:
Can I use my (insert the name/model of your charger/cycler here) to charge my
new packs?</i></b></span></div>
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</div>
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<span style="color: black; font-family: "arial" , "helvetica" , sans-serif; font-size: x-small;">A: I get this one
via email an awful lot... the answer is always the same: "Every charger mfg
ships their chargers with a manual... in that manual will be the operating
parameters and what type (NiCad, NiMH, Lithium, Gel/Lead Acid, etc) the charger
is designed to charge. </span></div>
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<span style="color: black; font-family: "arial" , "helvetica" , sans-serif; font-size: x-small;">Folks.. I build
battery packs.. I don't do brain rentals and I'm surely not the planet's charger
manual librarian... and you absolutely have got to do your own 'homework'
regarding how to use your charger. If you don't have a manual for your charger
and you made it this far, you can certainly figure out how to use a web
browser/search engine to locate either a RCU or magazine review or the charger
mfg's website for technical info on their product.</span></div>
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<span style="color: black; font-family: "arial" , "helvetica" , sans-serif; font-size: x-small;">So, read the
manual to learn how to use it, and how to set the charger up for the type of
battery you intend to charge. Then check the battery pack label. On our pack
labels you'll find the cell technology type and the recommended charge rates for
both fast and slow/formation charging.</span></div>
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<span style="color: black; font-family: "arial" , "helvetica" , sans-serif; font-size: x-small;"><b><i>Q:
What's up with 'Formation Charging'? Can't I just charge and fly a new pack?</i></b></span></div>
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<span style="color: black; font-family: "arial" , "helvetica" , sans-serif; font-size: x-small;">A: The term
'Formation Charging' describes the initial charge/discharge 'forming' process
that fully activates the 'chemical engine' and balances the cells in a new pack.
NiMH packs have a particular need for repetitive c/10 charge/cycle conditioning,
a 'break-in' procedure needed to get them to full rated capacity. Both NiMH and
NiCad packs benefit from the process and the intent is to make sure that any new
pack has been verified to be fully operational and that a 'start-up' capacity
number is established for the pack before it's put into service. To 'Form' a new
NiMH pack do three 10% 16-24 hour charges followed by a 300 to 500 ma discharge
routine between each charge. In other words: Do a slow charge at the slow charge
rate (or as close to it as you can reasonably get with your equipment) as shown
on the pack label. Charge till the pack is warm, followed by a controlled
discharge with a cycler. Do it 3 times. The recommended Formation Charge/ Slow
Charge rate for our packs is printed right on the label of the pack as well as
on the data card the pack was shipped with. New NiCad packs should get at least
one slow charge followed by a 300 to 500ma discharge. Record the capacity
numbers reported by your equipment for comparison cycling as the pack ages.
Never check your brain at the door! As one respected modeler put it, "There's
nothing more suspect than a new battery pack." Before you fly anybody's pack be
certain it's fully operational and safe to fly.</span></div>
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<span style="color: black; font-family: "arial" , "helvetica" , sans-serif; font-size: x-small;"><b><i>Q: I
have a programmable charger. What discharge rate and voltage cutoff value should
I use for the Formation Process?</i></b></span></div>
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<span style="color: black; font-family: "arial" , "helvetica" , sans-serif; font-size: x-small;">A: Most
programmable charger/cyclers allow programming the discharge current and the low
voltage cutoff level for the discharge. If using a 250-300ma (.3) discharge rate
set the cutoff voltage value at 1.0v per cell. If using a 500ma (.5) discharge
rate set it at .8v per cell. For formation charge/discharge routines on Rx and
Tx packs we don't recommend using a discharge rate higher than 500ma (.5) and
DON'T discharge under any circumstances below .8v per cell !! Packs with cell
impedance ratings below 10 mOhms CAN de discharged at 1.0 amps AFTER going
through the formation process.. BUT NOT BEFORE.</span></div>
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<span style="color: black; font-family: "arial" , "helvetica" , sans-serif; font-size: x-small;"><b><i>Q:
What’s ‘cycling’ and why do I need to do it?</i></b></span></div>
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<span style="color: black; font-family: "arial" , "helvetica" , sans-serif; font-size: x-small;">A:
Battery
‘cycling’ in it’s simple form is the two step process of charging and then
discharging the battery under controlled conditions. Normally the purpose of
the procedure is to ‘condition’ or ‘format’ a new pack or to verify the capacity
or check the condition of a pack that’s been in service. ‘Routine’ cycling, or
discharging before recharging a pack after every use is not necessary for either
NiMH or NiCad packs, and discharging to ‘zero’ voltage under load is in fact
harmful. A ‘cycler’ or controlled discharger will limit the discharge voltage
level to prevent damage to the pack, whereas ‘leaving the switch on’ in your
radio system to discharge a pack is very poor practice and may result in damage
your radio system components or the battery. </span></div>
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<span style="color: black; font-family: "arial" , "helvetica" , sans-serif; font-size: x-small;">Most ‘hobby’
cyclers or dischargers operate at a predetermined load and cutoff level that is
different than the cell mfg’s rating system. This leads to discrepancies that
can be a high as 10-15% of rated capacity between the mfg’s rating and the
rating presented by the cycler or discharger you are using. If your cycler or
discharger system’s numbers are lower than the comfort zone described above then
you need to verify the calibration of the cycler and check the charge rate and
charge time to insure the pack did indeed get a full charge before the discharge
function began. If the numbers are still uncomfortably low after re-running the
test with your new pack, we suggest you contact the assembler or retailer for
evaluation assistance in determining what the cause is before using the pack in
a critical application. Any pack cycling more than 25% below
the mfg's rating or the original numbers established for the pack with your
equipment when it was new should be removed from critical application service.</span></div>
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<span style="color: black; font-family: "arial" , "helvetica" , sans-serif; font-size: x-small;"><b><i>Q:
How do I know if my pack is fully charged? </i></b></span></div>
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<span style="color: black; font-family: "arial" , "helvetica" , sans-serif; font-size: small;">Temperature is
the key.. always, always, always! IF THE PACK ISN'T WARM AT THE END OF THE
CHARGE ROUTINE, IT ISN'T CHARGED! Note I said 'warm'. Not HOT! Hot is NEVER GOOD
at the end of the charge routine.. but warm is OK. If using a temp probe, set it
for 10 degrees above AMBIENT. If it's a peak controlled charger and the charger
shuts down before the pack is slightly warm to the touch.. IT ISN'T FULLY
CHARGED. If it's a timer controlled charger and at the end of the charge period
the pack is not warm.. it's NOT fully charged yet! By far and away the biggest
reason for low capacity numbers is undercharging.. if you have a 5 gallon pail
with only 3 gallons in it, your only going to get 3 gallons out of it. Engage
your brain.. check temperature at the end of the charge routine! </span></div>
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<span style="color: black; font-family: "arial" , "helvetica" , sans-serif; font-size: x-small;"><b><i>Q:
Temperature?? I thought voltage was how you could tell the pack was charged?? </i></b></span></div>
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<span style="color: black; font-family: "arial" , "helvetica" , sans-serif; font-size: small;">A: More packs
have been fried by guys looking for a 'number' instead of temperature on a
charger than any other cause of premature battery failure. The 'finish' voltage
of a pack will vary under an astounding number of variables.. but temperature
rise ALWAYS signals that the cells are charged in a slow charge routine. Why?
Because when the cells can no longer absorb the energy being shoved at them by
the charger, they begin to give the unstored energy off as heat. </span></div>
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<span style="color: black; font-family: "arial" , "helvetica" , sans-serif; font-size: small;">Taking the
Temperature story to the next level.. fast charging. Here we can generate even
more heat. Some high-impedance cells like AA NiMH's can get warm when being
charged at 'normal' 1C (fast) or even 10% (slow) rates. They can get warm BEFORE
they get to full charge. Why? Because high-impedance cells don't absorb energy
as efficiently at high current levels.. just like they don't give up energy
efficiently at higher discharge rates. So.. before you crank up the current on
your charger on your new NiMH Tx
pack.. check the pack label on our packs.. and set the charge rate recommended;
which is often LESS than the 'industry standard' for NiMH cells. </span></div>
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<span style="color: black; font-family: "arial" , "helvetica" , sans-serif; font-size: small;">Final word on
temperature: Aside from being a key indicator for correct charge time, rate and
final charge condition bear in mind that heat is the bitter enemy of NiMH Cells.
Drive the pack into thermal overload (hot) on the charger and it's likely you'll
ruin it. Pay attention to the temperature! </span></div>
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<span style="color: black; font-family: "arial" , "helvetica" , sans-serif; font-size: x-small;"><b><i>Q:
How long should I wait between charging and discharging for capacity checks?</i></b></span></div>
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<span style="color: black; font-family: "arial" , "helvetica" , sans-serif; font-size: x-small;">A: I actually had
a guy that sounded like he knew what he was doing run me through hoops for days
regarding low cycle numbers on his new packs. Finally he dropped the little
missive, "I've been waiting 24 hours after the charge to start the cycle...."
ARRRGH! Where do folks come up with this stuff? Here's the deal.. ALL battery
technologies have a self-discharge characteristic. NiMH self discharges at a
higher rate than NiCad. Lithium has the lowest self-discharge rate.... but the
point is, waiting a day (or an hour) to start a discharge after a charge will
trend the capacity return downwards. Nominally, depending on cell type, age,
impedance and temperature; a 10-15% capacity drop over 24 hours is not unusual.
So.. whatever goofy procedure you use.. do it the same way each time, because if
you change ANY parameter in a cycle test procedure you will effect a result in
the returned capacity number. Time span between charge termination and discharge
start impacts test results. Long leads impacts test results. Cycling through
switch harnesses impacts test results. Cycle testing in cold or hot conditions
impacts test results. Here, we cycle immediately after the charge completes. If
your cycle a day later, your numbers won't even be close to mine.. or the cell
MFG's. Same goes for long leads, cold days, running your cycler through system
switches.. ENGAGE THE BRAIN... YOURS, NOT THE CHARGER / CYCLERS!</span></div>
Unknownnoreply@blogger.comtag:blogger.com,1999:blog-4359718631206185948.post-55622086116723971492015-01-11T03:09:00.000-08:002015-01-11T08:31:36.248-08:00HPI SAVAGE XL OCTANE Review<div style="background: url(http://4.bp.blogspot.com/-n8Fl_SKMHYA/VLKIVDrXSbI/AAAAAAAAB40/Bvip1hcoQSI/s1600/header.jpg); color: black; height: 419px; margin-left: -16px; padding: 5px; width: 1218px;">
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<br />
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<div style="background: url(http://1.bp.blogspot.com/-bBaa1cdu5JI/VLKJDhayR1I/AAAAAAAAB5A/jNM1Emm4VOE/s1600/top_view.jpg ); height: 812px; margin-left: -16px; margin-top: 100px; padding-top: 100px; width: 1228px;">
<div style="margin-left: 60px; margin-top: -159px;">
<b>Specs:
</b><br />
<br />
<ul>
<li>RTR or Kit: RTR</li>
<li>2wd or 4wd: 4wd</li>
<li>Shaft or Belt: Shaft</li>
<li>Electric or Gas: Gas</li>
<li>Waterproof: Yes</li>
<li>Scale: 1/8</li>
<li>Length: 23″ or 585mm</li>
<li>Height: 265mm </li>
<li>Width: 17.5″ or 445mm</li>
<li>Wheelbase: 15.5″ or 395mm</li>
<li>Engine: 2.7hp GT15C 15cc 2-stroke engine with pullstart</li>
<li>Radio: HPI TF-20E 2.4GHZ TRANSMITTER</li>
<li>Differential: Beveled Gear</li>
<li>Clutch: 14T</li>
<li>Driveshafts: Dog bones front and rear</li>
<li>Shocks: 4 Big Bore Sport Set. Plastic bodies and caps, oil filled</li>
<li>Weight: 15.6 lbs</li>
<li>Servo Saver: Steering Crank</li>
<li>Screws: Phillips</li>
<li>Bearings: Full set</li>
<li>Tires: Terra Pin Tires S-Compound</li>
<li>Battery: 2 x 5 cell hump packs</li>
<li>Part Number: # 109073</li>
<li>Runtime: 25+ Minutes on full take of gas.</li>
<li>Warranty: “Two year limited”</li>
</ul>
</div>
</div>
<div style="text-align: center;">
<span style="font-size: x-large;"><b>Buy YOUR HPI SAVAGE XL OCTANE NOW</b></span></div>
<br />
<div style="text-align: center;">
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<div style="background: url(http://1.bp.blogspot.com/-vXDkPf92wT8/VLKd824CYZI/AAAAAAAAB5M/jif1AXrNIZ8/s1600/gas_engine.jpg); height: 625px; margin-left: -16px; margin-top: 100px; padding-top: 100px; width: 1228px;">
<div style="margin-left: 688px; margin-top: -80px; padding: 62px;">
The Savage XL Octane has got a lot of torque. It gets that massive SAVAGE truck going very fast in the first gear, even allowing you to do a wheelie from a
standstill.<br />
The world has been waiting for almost 3 years since HPI Racing announced the Savage XL Octane, and that's a good thing, we weren't holding our breath because we were expecting it a little bit sooner. The Savage XL Octane is the first 1/8 Scale GAS(octane) monster truck to hit this the radio controlled car market, and a lot of people are thinking if this will be the beginning of the turn from electric vehicles dominance to a full change in the market place. Should you start saving your cash? Is the next rc vehicle you buy going to be gas? </div>
</div>
<b>What You Need To Complete:</b> You will need gas mixed with 2 cycle oil (Oil included in box), gas can, battery charger for the internal batteries.<br />
<br />
<b>Build Quality:</b> Out of the box we didn’t notice any
issues with the Octane. Nothing was binding, shocks were filled,
everything rolled smoothly.<br />
<br />
<b>Test Drivers:</b> Brian, Wrench (Bill), Adam the Intern, Rick<br />
<br />
<b>Test Venues:</b> Industrial Park, Local Street, Several Forest Preserves, and the Big Squid RC Secret Test Track Facility.<br />
<br />
<b>Set-up Notes:</b> We ran the Savage XL Octane completely
stock. We used Premium gas mixed with regular 2 cycle oil at a 25:1
Ratio. We also used a <b>Duratrax 235 Dual Charger</b> to
charge up the included two battery packs. If you are in/from the US, you
will need to break out those thinking caps to get your mixture right as
everything is in milliliters.<br />
<br />
<b>Turning:</b> We were pleasantly surprised at the overall
turning of the truck. It was effortless to steer it any direction you
wanted to go, and under just about any condition. From foot tall grass,
to loose dirt and gravel, the steering servo had enough muscle to put
the wheels anywhere you wanted them. Of course it’s a big heavy monster
truck, so if you weren’t careful you could roll it and find yourself
doing the walk of shame.<br />
<br />
<b>Jumping:</b> The Savage Octane jumped well. While a lot of
the weight of the truck is in the rear end, the truck normally jumped
very straight. If needed, you could tap the brakes and bring the nose
down, but bringing the nose up proved more difficult. Getting that heavy
mass to rotate up just wasn’t that quick. Speaking of heavy, the truck
weighs more than 15 pounds, and while the shocks were pretty beefy,
there was little they could do when landing from some good size air. We
found the truck bottoming out often on even the best of landings.<br />
<br />
<b>Bumps/Whoops:</b> In the rough stuff, the truck was a
champ. The heavy weight kept the truck moving quickly forward with
little to no bouncing while the shocks ate up the bumps while doing all
the work. Anytime we were in the dirt, the truck handled great.<br />
<br />
<b>On-Road:</b> While off-road is obviously the place for
this monster truck, on-road bashing happens. The octane had no problems
giving us wheelies on command, and long stretches of road gave you an
idea of the speed while you listen to the 3 speed transmission work it’s
way through all the gears.<br />
<br />
<b>Grass:</b> The Savage XL took on the tallest of grass
and didn’t even blink. We were in plenty of un-mowed fields with grass
often over 12″ tall and the truck mowed it down without a problem.<br />
<br />
<b>Tires:</b> The pin tires handled well on dirt and in the
grass. They are the same/similar tires as previous nitro Savage XL
vehicles, but maybe with different foams? Our other Savage tires would
balloon much easier, and didn’t have the same strength in side to side
action as these did. That being said, I feel we would of been happier
with something a little more blocky for all around bashing as these pins
won’t last long with the type of abuse we like to give the vehicles.<br />
<br />
<b>Power:</b> The Savage XL Octane has plenty of torque. It
gets that massive truck moving pretty quickly in first gear, even
allowing you to wheelie from a standstill. We joked that it probably had
enough torque to pull Wrench across the grass when he was hanging onto
the rear bumper when I bliped the throttle. That being said, it seemed
like we always wanted just a little more. The truck needs to shift into
second gear almost instantly as first is just to get you rolling. As it
worked it’s way up to speed, you could see the look on the face of
whoever was driving wishing it would just – get there – a little –
faster. Our average speed measured by radar gun was 36 mph. This isn’t
slow by any means, but in a world where similar sized electric and nitro
vehicles can hit 50+ we were looking for more. If the top speed was 36
and it got there FAST, that would be ok, but it takes a bit of time to
hit that top speed.<br />
<br />
<b>Radio:</b> The TF-20E 2.4GHZ radio the truck comes with
left us a little disappointed. Previous pack in Savage radios featured a
drop down style wheel, foam, and felt good in your hand. For our almost
$1000 truck after taxes, the radio seemed on the cheap side. It worked
well enough, we didn’t have any glitching or distance issues, it just
wasn’t as good as previous HPI radios. <br />
<div style="text-align: center;">
<span style="font-size: x-large;"><b>Buy YOUR HPI SAVAGE XL OCTANE NOW</b></span></div>
<br />
<div style="text-align: center;">
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<div style="background: url(http://2.bp.blogspot.com/-vvrPBq-t_u8/VLKgv7ua6nI/AAAAAAAAB5U/sBcxrNT-lMM/s1600/xl_width.jpg); color: black; height: 689px; margin-left: -16px; padding: 5px; width: 1218px;">
</div>
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<div style="background: url(http://2.bp.blogspot.com/-0hgrXy_YfJs/VLKg1mw2hrI/AAAAAAAAB5c/RrRLbUGjwp4/s1600/chassis_callout.jpg); color: black; height: 849px; margin-left: -16px; padding: 5px; width: 1218px;">
</div>
The truck looks good. The wide body was liked by everyone, and it
gave it a aggressive stance. It’s also held up very well to our week of
abuse. With the body off, and just the cage, it looked equally as mean,
leaving us to think of what other body styles we could run or make fit
that would show off this look a little more. <br />
We aren’t big fans of the ignition off switch or location. Just
knowing you will eventually have a problem where you NEED to shut it
down, a little red slide switch right above a fast spinning tire is no
place we want to put our hands. <br />
We are sure the two separate battery packs (one for servos and radio,
the other for the ignition system) are there for a reason, but a one
pack solution would of been nice. Not sure if that’s even possible
though. This also leads to having two on/off switches. And while in your
head, you know your supposed to shut off the red one first, it’s
inevitable that someone, at some point will shut off the radio one
first, and you better hope your fail safe is ready to go. <br />
The brakes work very well for the size of this beast. We had no problem slowing down or stopping when needed.<br />
<br />
The included body clips are a good size. Easy to attach and remove,
too bad Wrench lost one of ours in the grass shortly after testing
started. (He claims I wouldn’t let him forget.. so why not remind him
here)<br />
Previous Savages tended to eat diff gears for lunch until you got
them shimmed perfectly, we haven’t experienced any issues with the Diffs
on the Octane so far.<br />
<br />
<b>Overall: </b> Congratulations to HPI for being first out
the gate for this new genera of 1/8th scale gas vehicles. After
announcing it almost 3 years ago, it was a close race to see who was
going to make it to the market first. While the Savage XL Octane is now
out the gate, we think there is room for improvements, and we hope to
see lots of aftermarket support for the vehicle. As time goes on, we may
update this review to include tips or tweaks we have found to work
well.<br />
<br />
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