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Old Apr 19, 2010, 07:37 PM
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surfer dude's Avatar
Jenks, Okla.
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quickie 500 conversion?

I want to compete with the glow boys on thier turf with an electric version of thier quickie planes, but I'm not sure what motor esc to use.
Here's the facts
Plane- Great Planes viper http://www.greatplanes.com/airplanes/gpma1265.html
Weight rtf should be around 4.5#
Top speed needs to be around 130mph in the straights
Race time 2.5-3 minutes (3.5 min. run time should be plenty)
I'm thinking a 4 cell lipo, 8x8 prop
about 650 watt system for this plane should be good.
I just need help finding the right motor esc combo to compete and win.
Thanks
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Old Apr 20, 2010, 01:44 AM
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I don't thinkk 650W will be enough for 130mph. I know some people using 6S 5000mah on a Turnigy 50-55 with a 10x8 prop. this is pulling 85amps static which should drop in the air.
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Old Apr 20, 2010, 02:12 AM
hondaboy92hatch
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United States, WA, Vancouver
Joined Feb 2005
725 Posts
I did this conversion a few years back. it was a very fun plane and mine had over 1200 watts on the first one and alittle less on the second. I used the scorpion HK 3026-1900 5s and an 8/10 gas prop. I don't know how to put it in but look for my thread here on high performance and you can get alot of good tips from everyone. throw away the wheels that come with the kit they suck.

Joe
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Old Apr 22, 2010, 10:16 AM
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gotboostedvr6's Avatar
USA, NJ, Mt Laurel
Joined Oct 2007
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I would find a 200 gram outrunner thats around 1300-1400 kv and spin a 7.4x7.5C Q40 or 7.8x7 APC pylon combat prop on 6s 3300 or 3800. Expect around 100 amps and tailor the mah of the lipo to the desired run time.
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Old Apr 22, 2010, 02:10 PM
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Troy's Avatar
United States, CA, Lake Forest
Joined Feb 1999
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I'd look at something like a 1902-2.5Y, 8X8 prop on 4S-4900 cells. Plug it into P-Calc to see:
http://brantuas.com/ezcalc/neumotorscalc.asp
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Old Apr 22, 2010, 09:06 PM
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Calgary, AB, Canada
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Quote:
Originally Posted by Troy View Post
I'd look at something like a 1902-2.5Y, 8X8 prop on 4S-4900 cells. Plug it into P-Calc to see:
http://brantuas.com/ezcalc/neumotorscalc.asp
Funny you should suggest that Troy, I was just playing what-if with the same motor/pack combo. Our (Canuck) Quickee C500 is the same as USA 428 airframe wise but we run old school Nelson SS engines with inner pipe removed to knock the speed down a bit & also run on shorter course. Guessing they are 155-160 mph? P-calc spits out 18.7 Krpm & 141 mph (sounds about right) & 3.28 minutes FTD (plenty for 10 laps & then some).

But what surprised me was the pack + motor = 22 ounces. On the slimer side I think the engines are 16 oz, add a 5 oz tank of fuel & its ~ 20 oz so no big weight advantage on electrics. 1180 watts = 1.58 hpe, Im actually not sure what the slimers are rated at, thought it was over 2 though. The above calc shows 85amps/4.9 Ahr = 17C, not really taxing the lipos hard. Maybe just 'up' the pitch & it could be there.

Have you seen anyone do this e-conversion to replicate faster (428-ish) Q500? The 6S would give more comparable power, but that would start getting porky compared to the gassers.
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Old Apr 22, 2010, 09:55 PM
The Kid
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Detroit, MI
Joined Dec 2007
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For our sport 40 racing at our club, we would run ST .45 with a Ultrathrust muffler. Using a 9x7 APC cut down to 8.8x7 (just the tips shaved off and shaped a little, not anything tricky), we would get ~17.5k rpm. This was using 15% Power-Master fuel

With this setup in our Dodger (old-school ~mid 90's design with a low-wing and conventional tail, though im not sure this truely makes it slower as it beats out all the Vipers) it will hit about 135mph halfway down the straights.

So, this appears to be the type of performance you are looking for. So the 17.5k rpm with a 9x7 would be a great goal. I would suggest that in my experience the RPM figures on the NEU calc are about 10% high. So the 1902 setup might actually be a pretty close fit. I would suggest that one of the Scorpion/Hyperion outrunners would work very well for you on 6s. This would be cheaper, and hopefully nearly as efficient, while also allowing slightly lower amp draw (at the expense of higher voltage). A power system like those run in the E-Outlaw deltas might work well, if you propped down a little (they are usually around 100A)

Just something to consider
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Old Apr 22, 2010, 11:00 PM
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I always forget this last step. The specs say 1902 2.5Y is rated 300 watts, 600 surge. I wonder how long before continous 'double-surge' would cause issues.
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Old Apr 23, 2010, 05:06 AM
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surfer dude's Avatar
Jenks, Okla.
Joined Oct 2009
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Thanks for all of the great info! I did try the motor calc, but I'm not confident in my results enough to sink that much money in motor and esc, without seeking the advice of others. Speeking of money, I would realy like to use Turnigy gear if possible, so that I could order from HK. Scorpion is not too bad on price, but those Neu motors are too much.
I knew there had to be a few guys out there who had tried this before.
Keep the Ideas comming. I need all the help I can get.
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Old Apr 23, 2010, 09:05 AM
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gotboostedvr6's Avatar
USA, NJ, Mt Laurel
Joined Oct 2007
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This setup will do what your looking for :

burly 12p14n motor
http://www.hobbycity.com/hobbyking/s...idProduct=8485

with small lipo
http://www.hobbycity.com/hobbyking/s...0mAh_5S1P_40C_

with large lipo
http://www.hobbycity.com/hobbyking/s...00mAh_5S1P_40C

this prop
http://www.apcprop.com/ProductDetail...ctCode=LP07870

this esc
http://www.hobbycity.com/hobbyking/s...rogrammability

Make sure you dont use a spinner because the motor needs the cooling air to operate at this power level.

Expect 141-143 mph depending on airframe
100 amps static
81-84 amps in flight
26,500 rpm static
29,500 plus rpm in flight again dep on airframe
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Old Apr 23, 2010, 09:58 AM
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Troy's Avatar
United States, CA, Lake Forest
Joined Feb 1999
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Quote:
Originally Posted by ptxman View Post
I always forget this last step. The specs say 1902 2.5Y is rated 300 watts, 600 surge. I wonder how long before continous 'double-surge' would cause issues.
Good point. For 4S the kv needs to be up at 1400+kv. You need a longer motor.
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Old Apr 23, 2010, 06:07 PM
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$20 motor
$45-60 battery
$60 controller
140 mph?!?!?!
Wow, I am not a fan of "disposable" components, but I do love Hobby King! That's only $1/mph.

Just to clarify your speed claim, is this on a draggy airframe like a Q-500? I've always wanted to fly an electric, but in the past, it just wasn't financially worth the trouble. Things are different nowadays...

Quote:
Originally Posted by gotboostedvr6 View Post
This setup will do what your looking for :

burly 12p14n motor
http://www.hobbycity.com/hobbyking/s...idProduct=8485

with small lipo
http://www.hobbycity.com/hobbyking/s...0mAh_5S1P_40C_

with large lipo
http://www.hobbycity.com/hobbyking/s...00mAh_5S1P_40C

this prop
http://www.apcprop.com/ProductDetail...ctCode=LP07870

this esc
http://www.hobbycity.com/hobbyking/s...rogrammability

Make sure you dont use a spinner because the motor needs the cooling air to operate at this power level.

Expect 141-143 mph depending on airframe
100 amps static
81-84 amps in flight
26,500 rpm static
29,500 plus rpm in flight again dep on airframe
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Old Apr 23, 2010, 06:29 PM
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Calgary, AB, Canada
Joined Oct 2002
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Quote:
Originally Posted by gotboostedvr6 View Post
This setup will do what your looking for :

burly 12p14n motor
http://www.hobbycity.com/hobbyking/s...idProduct=8485

100 amps static , 81-84 amps in flight

But... 100A static, 80A flight... vs motor spec 70A for 20 sec <burst> & 45-50A <intended?>.

Specification: No. of cells: 3-6S, RPM: 1450kv
Max efficiency current: 45A-50A
No load current: 11.1/4.6A
Current capacity: 70A/20sec
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Old Apr 23, 2010, 07:26 PM
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Troy's Avatar
United States, CA, Lake Forest
Joined Feb 1999
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I was looking for a similar set up on a glo delta I have that needs a conversion. I'd like to run 5-6S and 7.5" prop. HK is out of a lot of motor stock these days.
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Old Apr 23, 2010, 09:43 PM
The Kid
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Detroit, MI
Joined Dec 2007
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It seems 7.8" prop is too small for a Q500, no?

My impression was with today's long-stroke nelsons the go-to prop was something like an 8.75x9.25 or similar? I think the short strokes are something like an 8.75x8.5?

Seems as though you would want more thrust then the Q40 prop will allow for if you're going to try and keep up in 428
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