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Gee Bee Z 1.20 convert to EP

Old 01-12-2009, 04:46 PM
  #1  
Gee Bee Ace
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Default Gee Bee Z 1.20 convert to EP

I have A segull models Gee bee Z 120 quite a nice plane and i wish to convert it to electric. To save a bit of money i have two 6s 3000 25c lipo packs from my Trex 500 and was hoping to use these.

I now need some advice on motors and speed controls to compleat the power combo.

I have seen on you tube a guy with an R1-R2 electric it wasnt too sucessfull but it did get off the ground, apart from that i havent seen much else of this size electric.
Any advice would be apreciated

The Packs are 0.435 kg each


Last edited by Gee Bee Ace; 01-12-2009 at 09:22 PM.
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Old 01-12-2009, 06:19 PM
  #2  
pburt1975
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sorry I cannot help with much, but for those that do know some Gas to electric conversions, here's the specs on that plane

Specifications:
Wingspan - 70.9ins (180cm)
Wing area - 863.4 sq.ins (55.7sq.dm)
Suits - 120 2 Stroke (150 - 4 Stroke)
Factory covered with Profilm
Length - 46.6ins (118.3cm)
Approx flying weight - 10.6-11.5lbs (4.8-5.2kg)
Servos - 6 x High powered


http://www.sussex-model-centre.co.uk/shopexd.asp?id=27190.
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Old 01-12-2009, 07:22 PM
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Gee Bee Ace
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Thanks for the extra info i was just hunting around looking for all that.

Just doing the caculations
@75 watt per pound im looking at a total of around 900w to get it to fly at least (there aint much wing)
@ 22.2 V its gonna need 40.5 A wich these two packs should be able to handle (20 A each)
now just to work out the motor and prop
And hope i can get all the weight forward enough to balance it

Am I thinking right?
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Old 01-12-2009, 07:29 PM
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pburt1975
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Firemanbill has a Waco biplane that is powered by over 1000w, I'll see if I can find his power system info. Me, Im still strugglin to be at 100w so not much help elsewhere.
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Old 01-12-2009, 07:48 PM
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pburt1975
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Cox 5030/18
Cox 90 Amp Opto ESC
20x10 APC Prop
8s 4000mah (2x in series)
6v radio battery
Spektrum radio gear, JR Servos

AUW on mine is around 14 lbs
Waco power setup. from this thread
http://www.wattflyer.com/forums/show...tor#post309035

post 5
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Old 01-12-2009, 08:02 PM
  #6  
Gee Bee Ace
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Wow thanks for that looks kinda like i might need some more balls to get this happening.
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Old 01-12-2009, 08:24 PM
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pburt1975
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heres a suggestion, 1200w
HXT 50-65B 350kv Brushless Out
Wim Van Audenaeren I'm running this motor my 1m80 Extra (5kg) and is doing an excellent job!

I'm spinning a 18x10 APC-prop on a 6s2p HXT2200 lipo pack. Current is 60A. This gives it a total of over 1200 WATT! It gives the plane an unlimited performance. I LIKE THIS MOTOR VERY MUCH.

Thanks to UH,

Wim.
http://www.hobbycity.com/hobbycity/s...idProduct=2101

This is a buggy site, and in a different language, but it translates well through google (right click on page, go to 'page info' and click 'translate to english'. has some info on bigger motors including test data
http://www.bungymania.com/index.php
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Old 01-12-2009, 09:09 PM
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Gee Bee Ace
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Thanks that has helped
those HXT motors look to be as big as i could run on those packs.
I notice that there is different models A B C D with different Kv ratings any tips with working out what is best, Im not full bottle on EP

Another thing i note is these motors are rated to be comparable with .70 one bloke reckons .90 glow motors yet they are swinging much biger props that my 1.20. is this due to a lower RPM ?
I was thinking with the large cowling on the gee bee i would be better of with a lower rpm motor and larger prop providing i have ground clearance on take off. that would be embarassing:o
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