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Nitro to Electric Information - 12/13/2010 5:30 AM   
GeorgeG97322



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From: Albany, OR, USA
Status: offline 		Does anyone know how or where to find a conversion size for converting from a nitro engine to electric, probably brushless.  Specifically for Hotter .049's like the Tee Dee.

Thanks,



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RE: Nitro to Electric Information - 12/15/2010 7:01 PM   
iflyg450


 

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Status: offline 		Its tough to convert 049, I have tried. The smallest out runner made by great planes works okay buy requires an 8" prop and the speed will not be as good as the TD. If you go to an inrunner that can turn a 6x3 or 6x4 it will be way to heavy. Check out stevens aero model they have some 1/2a electric U/C kits and offer up a very well priced outrunner. If you do go the electric route, flip the prop over and run the motor clockwise this way the P-factor of the prop will help keep the lines tight. Its tough to beat the power to weight of the 1/2a engines. When you go to get the timmer the one one E-flite workd GREAT!!! I have used it in a few Fox 35 conversions. The only drawback to going electric is you loose the 2-4-2 running.

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RE: Nitro to Electric Information - 12/15/2010 9:09 PM   
coriolan


 

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Status: offline 		If he flip the prop around and run the motor clockwise his plane will fly backward This is a good replacement for a Cox .049, swing the same size prop at similar rpm:
http://www.bphobbies.com/view.asp?id=V450327&pid=B2632603
That motor is even better bur OOS right now!
http://www.bphobbies.com/view.asp?id=B2552587&pid=B2552590

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RE: Nitro to Electric Information - 12/15/2010 9:30 PM   
jcralley


 

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Status: offline 		I'm using a Turnigy 2822 1400kv motor ($13.30 plus shipping) with an APC 7X5 thin electric pusher prop and a 3S Li-poly battery. Works great on a Baby Ringmaster.

https://www.hobbyking.com/hobbycity/store/uh_viewItem.asp?idProduct=4915

You maybe could get by with a smaller motor but this one I know will work.

John




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RE: Nitro to Electric Information - 12/15/2010 10:35 PM   
DwayneD


 

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Status: offline 		Here you go, a turnkey set up.
http://www.brodak.com/shop_productdetail.php?ProductID=8866

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RE: Nitro to Electric Information - 12/15/2010 10:54 PM   
iflyg450


 

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Status: offline 		Sir if you are looking aft a standard prop turn counter clockwise. If you flip the prop over and switch the leads so the motor turns clockwise that same prop will pull the plane and have the p factor of the prop helping you keep the line tight. Also the last timer I saw from brodak, it did not have a way to adjust the rpm and had only three timer 3,5,8 min settings. The E-flite timer is only 9.95 it has a adjustment knob for rpm and can be adjusted for 1 min incriments

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RE: Nitro to Electric Information - 12/16/2010 4:17 AM   
GeorgeG97322



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Status: offline 		Wow,  Thanks all, really good info here.  Electrics are still a mystery to me...

George

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RE: Nitro to Electric Information - 12/16/2010 2:39 PM   
mikeainia


 

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quote:

ORIGINAL: iflyg450

Sir if you are looking aft a standard prop turn counter clockwise. If you flip the prop over and switch the leads so the motor turns clockwise that same prop will pull the plane ...


No, it won't. "Flipping the prop over" doesn't change it to a "Pusher" style. It only makes the airfoil run upside down - the pitch is still in the same direction. Try it.

If you get a "pusher" prop and run it in the opposite (from the usual) direction, it will indeed fly the model in the same direction. Unfortunately, the selection of Pusher props is quite limited, compared to Tractor props and the effect on line tension is really not all that dramatic.





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RE: Nitro to Electric Information - 12/16/2010 2:48 PM   
mikeainia


 

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quote:

ORIGINAL: coriolan

If he flip the prop around and run the motor clockwise his plane will fly backward This is a good replacement for a Cox .049, swing the same size prop at similar rpm:
http://www.bphobbies.com/view.asp?id=V450327&pid=B2632603
That motor is even better bur OOS right now!
http://www.bphobbies.com/view.asp?id=B2552587&pid=B2552590


I am using the first motor (2212/6 = 2200 Kv) on 2 cells with a 7-6e cut down to 6". It turns over 14000 RPM and on 800 mah cells flies for 4+ min. It is enough power to pull a 200 sq. in. stunt-type through the beginners pattern with ease. Or a 180 sq.in. combat style plane at about the speed a black widow would fly it.

The important spec's are it weighs ~50 g., and the Kv is > 2200. If you go to something with a lower Kv - say in the 1400-1600 range - you will need 3 cells or a much larger prop to get the same thrust, though you would also be pulling less current.


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RE: Nitro to Electric Information - 2/24/2011 4:20 AM   
rjbranchii


 

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Status: offline 		On the contrary the effect of pusher props on control line planes is not just considerable it is dramatic! It is so dramatic that the control line stunt community has been working with APC and they with us to develop more electric pusher props for us to use. It is one of the three dramatic advantages electrics have over glow motors in CL stunt. The reverse rotation of the prop causes P-factor to occur in the other direction so that at high angles of attack the tail of the plane is pushed in and thus the nose out and line tension gets created. Glow motor planes suffer dramatic loss of line tension at the high power high altitude maneuver areas, particularly the 3rd corner of the hourglass and the third loop of the clover. Reverse rotation changes this entirely and you wind up with the same line tension that you have anywhere else in the pattern. It is a huge advantage and the greater the wind the greater the advantage. Until you have flown the same plane with and without pusher prop its hard to believe how dramatic it is. I fly primarily planes in the 550 to 750 sq inch size (.40 to piped .75 glow size) and no longer use any tractor props.

The other two huge advantages are governed engine control that gives instantaneous power increase when more power is needed and dramatic breaking on down lines thus eliminating windup of airspeed, especially in windy conditions. The other of course is the 100% consistency of motor run one flight to the next. No more scrapped flights because of a poor engine run. Once set to the engine run rpm you want you are done. Each flight is the same month after month, year after year. Much more usable practice.

bob branch

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RE: Nitro to Electric Information - 2/27/2011 3:22 PM   
cutaway


 

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Status: offline 		FWIW, Fox has reverse rotation cranks available for quite a few of their engines that would allow the use of a pusher prop.

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RE: Nitro to Electric Information - 2/27/2011 4:37 PM   
rjbranchii


 

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Status: offline 		Big Art Adamisn did them a number of years ago but could not find takers. Course a fox is not a competative motor today, but the difference is stunning. Just be sure not to use an electric pusher prop on a glow motor. They are not designed to take the pulse loads of a glow motor and are much smaller in cross section (and much mroe efficient) and will blow off blades if used for glow motors.

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RE: Nitro to Electric Information - 2/28/2011 2:20 AM   
xby-1


 

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Here are two motors roughly equivalent to a Cox reed valve.
 


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