View Full Version : Converting Great Planes PT-40

08-26-2005, 04:23 PM
Hi all new here, anybody converted a Pt-40 to electric? Any help would be greatly appreciated.


08-26-2005, 04:28 PM
Well start us out with your budget. How much you willing to spend on the power system? That will help us...

The PT40's fly great, but I might be able to recommend another plane you will like better, if you want some ideas there too!?! ;)


08-26-2005, 04:47 PM
I really dont mind spending the money to convert it but I would also be interested in anything you could tell me. Thanks for such a quick response by the way!


08-26-2005, 06:34 PM
Here’s a couple of links that might be useful:



08-26-2005, 10:37 PM
Well for the PT-40 I would recommend the AXI 4120/14 4s LiPoly cells and about a 14x10 prop as a starting point.

I know of many who have converted the Sig LT25. I think it is a better flying airplane (IMHO). It will be a pound lighter and is about the same size.

I think that with the AXI 2826/10 with 3s LiPoly and 13x8 to start would be great. That motor in fact should be enough for the PT40 when flown as a trainer...


08-26-2005, 10:44 PM
Thanks for the help I really appreciate that. I am fairly new to the hobby and have the pt40 already built with a glow engine, but I really want to convert that to electric as glow is a pain in the *.

08-26-2005, 10:46 PM
How much does the airframe weigh? (No motor/radio or tank)...

01-08-2014, 04:26 AM
Hi rcers and jrb,
I also wanna converted my dads Pt-40 to electric.
Saw you reply with references but instructions are a bit complicated to a begginer. I will appreciate if you can give some basic instructions ( for dummies ) and details on the different things I need to look for. Nowdays the pt40 has its original setup with gas engine, receiver, servos, and avge futaba contol.
Any help would be greatly appreciated.


01-08-2014, 05:33 AM
Current simple way to convert almost any .40 glow model to electric is to get the E-Flite Power 46, or other brand motor with essentially the same specs, 4 cell 3300 mah to 5000 mah LiPo and a 40 to 60 amp ESC rated for 4 cell or more LiPo.
There is a wide assortment of appropriate motors out there.

4 long screws and whatever material desired to space the motor away from the firewall the right distance keeping the same thrust angle as with the glow engine.

You may need to remove the floor under the fuel tank to let the batteries slide far enough forward. Be sure to insert a spacer to keep them from rubbing the motor mounting bolts or the steerable nosewheel if its on the back side of the firewall.

CG should be the same electric as it was for glow with the fuel tank empty.

The PT-40 can easily take a hefty battery load.
You could work really hard to make things lighter... but you don't have to.

01-08-2014, 12:53 PM
I converted a GP Escapade with a G-32 but a Power 46 would work great too. Had an 80 amp esc laying around so I used it. Instead of using stand-offs, I built up the firewall with laminated ply sections and lots of epoxy. This added additional weight to the nose. In this case, I actually needed it.

If GP makes an electric version of the PT-40 like they do with the Escapade, they may sell a cowl. Check with Tower Hobbies on this.

I love GP models.

01-08-2014, 06:07 PM
Thanks both. I will start working on that.