
Dec 27, 2012, 03:53 PM  

Question
Advice on converting Top Flite T34  help save it from the swap shop!
Hi guys, I'm trying to help a friend with a glowtoelectric project and he's got some pretty specific parameters. He says that if he can't successfully convert the plane to electric then it's going to the Swap Shop in January. I wanted to reach out to the community to see if we can help save this beautiful plane from the chopping block!
He has a Top Flite T34. It currently has a four stroke 1.20 that seems to fly it quite well. Not overlypowered nor underpowered but just right. It's swinging a 15 x 8 glow prop. It has an 80" wingspan. The advertised weight is 10  14 lbs. but we don't know the exact weight so let's just say 12 lbs. for the sake of this discussion. It has EFlite electric retracts. Here are the specifics: My friend has an Exceed RC Monster Power 110, which is an EFlite Power 110 clone. It's 295 kV, and it will take 9cells max. He wants to use this motor if at all possible so he doesn't have to buy a new one. The other restriction is prop clearance. The T34 is a trike so that means he can go a max of a 16" prop. My suggestion was a slightly hotter motor with a deeplypitched 15" prop and at least 8 cells. I was thinking 10s would get the job done but the motor has a max input of 9s. He's pretty adament about using this motor. He was looking at an 15.75 x 13 x 3 APC glow prop but I've been down the road with 3blade props on .60sized planes and never really been happy. First, can the conversion be done with that motor and if so, what prop and cell count would you recommend? Help me keep this plane out of the swap shop! Thanks! 
Latest blog entry: Repairing the T28... again



Dec 27, 2012, 07:07 PM  
The high desert of Southern California
Joined Jul 2002
1,211 Posts

Running the number through this free online calc programs says the motor running on 8 cells swinging a 16X10 prop will produce about 216 ounces of thrust. that is about 13.5 pounds of thrust.
http://www.s4a.ch/eflight/motorcalc_e.htm Going to a 3 blade 16X10 thrust goes up to 257 ounces of thrust or 16 pounds of thrust. http://www3.towerhobbies.com/cgibin...?&I=LXRF50&P=7 http://www3.towerhobbies.com/cgibin...?&I=LXRF51&P=7 So he can use (2) 4s packs through a "Y" cable for 8s. Buzz. 
Dec 27, 2012, 08:25 PM  

Quote:
Buzz, thanks for the links! Brandon, we'd just have to try it. It's easy enough to buy a few props, bolt that motor to a test stand, and see what we get as far as amps goes. 

Latest blog entry: Repairing the T28... again


Dec 27, 2012, 09:40 PM  

Brandon, we'd just have to try it. It's easy enough to buy a few props, bolt that motor to a test stand, and see what we get as far as amps goes.
Exactly. I flew an 14+ lb 80" AT6 on a 245Kv Power 160 on 6s with a 20x15 prop. Plenty of speed and thrust. With your higher Kv and 13" pitch, your pitch speed will be similar. The 3 blades will help with thrust, as long as amp draw is not too high. That model only had about 7080 watts per lb. Here's a vid:


Dec 30, 2012, 09:07 PM  

Quote:


Latest blog entry: Repairing the T28... again


Jan 02, 2013, 07:16 PM  

Quote:


Latest blog entry: Repairing the T28... again


Jan 07, 2013, 07:39 AM  

Brandon and I ran some props on Saturday. Unfortunately his 3blade prop won't be here until today but we ran up some 2blade props. I think we found the winner but wanted to post them here for more opinions:
I really think the ticket is going to be the 16x12 on 9s. We weighed the plane and with a glow engine and fuel (he had forgotten to drain the tank ), it was just about 14 lbs. So let's overestimate and say it will be 14 lbs. with an electric motor and a 9s 5000 mAh pack. With 1700 watts, that's about 121 watts/lb. Not a crazy amount of power but should be fine for a trainertype warbird. It obviously won't have a high wing loading like fightertype warbirds so I think this should be fine. Thoughts? Opinions? 
Latest blog entry: Repairing the T28... again


Jan 14, 2013, 02:23 PM  

We tested the 16x10x3 prop yesterday and got pretty much the same numbers as the 16x12 2blade prop. So the conversion is definitely doable; it's a matter of hacking up the plane to fit batteries.
The amps and watts might be the same but the efficiency of the 3blade prop will be less. If he converts the plane, it will be a simple matter of flying it with each prop and see which setup he likes best. 
Latest blog entry: Repairing the T28... again


Thread Tools  
Similar Threads  
Category  Thread  Thread Starter  Forum  Replies  Last Post 
Sold  Robart retracts for Top Flite T34 mentor  Fidelity101  Aircraft  General  Miscellaneous (FS/W)  6  Jan 02, 2014 06:03 PM 
Sold  Robart retracts for Top Flite T34 Mentor  Fidelity101  Aircraft  General  Miscellaneous (FS/W)  6  Nov 02, 2012 06:15 PM 
Sold  Top flite t34 mentor  Fidelity101  Aircraft  Fuel  Airplanes (FS/W)  7  Oct 30, 2012 09:44 PM 
Sold  Top Flite MENTOR T34,Kit,Robart RetractsNIB  scale RC  Aircraft  Fuel  Airplanes (FS/W)  0  Jul 21, 2012 02:18 PM 
Sold  New Robart retracts Top Flite T34 / Bonanza  VHASC  Aircraft  Fuel  Airplanes (FS/W)  2  Jun 05, 2012 09:07 PM 