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Feb 05, 2015, 10:54 PM
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Thread OP

PT40 electric conversion

I am trying to take a PT40 and put a electric motor on it. Has anyone done this . What motor, ESC, prop, battery should I use. thanks in advance

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Feb 06, 2015, 01:34 AM
Registered User
scottc39's Avatar
put a link to the plane so we know what to look at for components
Feb 06, 2015, 07:54 AM
Registered User
TripleW's Avatar

PT-40 is similar to this bird.


Recommended Setup:

Motor: 4250-800KV brushless outrunner motor
Speed Controller: At least 60A ESC
Prop: 13 x 6.5 prop
Servo: Standard servo x 4
Battery: 3300mAh 4s LiPO
Feb 06, 2015, 03:41 PM
Electrons were young...
I converted one and used a few different motors on it.

42-40-750 with a 4S 5000 pack and 12x8 prop was a great setup with 12 minute flights.

42-5-800 with 4S 5000man pack and 13x8 was also good setup but I used the other setup so much more.
Feb 10, 2015, 12:07 AM
Kimbers Keeper.
BHOFM's Avatar
Mine has a Rimfire 32 on 4s, 5000. It is really a Tower 40 trainer, but just about the same plane.
I think it is a 11X6 apc. Flight times are near fifteen minutes with lots left over.
Did the battery differently. Pod held on with rubber bands, quick and safe.

Took all the stickers of, made a nice looking plane.
Feb 18, 2015, 11:00 AM
"the analog man"

More details?

I love your simple approach with the "pod". Can you show more detail on the pod, and how the pod/battery all go together. I'd like to do something similar on my J-3 Cub ARF.

Larry Fitch
Feb 18, 2015, 05:23 PM
Kimbers Keeper.
BHOFM's Avatar
The pod is made from 1/8 lite ply. Sized to fit your battery of choice. Vent in the front and

Battery lead goes out the back, hole in the fuselage for the ESC lead. Safe, all connections are
from behind the wing.

I installed three dowels so the pod could be moved forwards and backwards to get the CoG.
The top lip of the pod had a thin layer of silicone sealer to prevent slipping . I use four bands.
There is a thin layer of foam in the pod to hold the battery in place. The 4s 5000 just fits the

It has worked very well, and there seems to be no effect on the planes performance.
Feb 19, 2015, 10:35 AM
"the analog man"

Thank you


Thanks a lot for the details. I'm sure it will work on the Cub very nicely as well.
Thanks Again,
Larry Fitch
Feb 19, 2015, 06:27 PM
Registered User
Weedeater3's Avatar

PT40 electric conversion

I recently converted my PT40 using a Hobby King 35-42, 60 amp esc, 4s 5000 mah batt, and 10-6.5 wood prop (same that I used on the .40 engine). Got 10 minute flights with somewhat sluggish performance. Changed to 10-7e prop with similar results. I have yet to put a watt meter on it.

Any suggestions on using larger prop??
Feb 19, 2015, 07:34 PM
Electrons were young...
I tried a 35-48 and that was sluggish on the PT-40 even with a 12x6 prop so I can't imagine the 35-42 would work too well.
Feb 19, 2015, 09:46 PM
Registered User
I run that hobbyking 35-42 1100 on my eagle 2 and it has plenty of power on 3s. It runs 10x7 apce props. I converted a friends superstar 40 with a tacon 25 870kv on 3s and it runs a 14x7 apce. It weighs under 5lbs and has about 95w per lb. my eagle weighs under 4lbs and had 450w of powerr.
On the superstar I cut a hatch where the tank used to be by cutting inside the fuse sides, firewall, and windshield then glued in side rail supports, tounged the back end and used a pair of magnets for the front side of the hatch. It works great. Quick painless batters swaps

I think the kv has a lot to do with prop size range and amperage draw.
Feb 20, 2015, 01:16 PM
Kimbers Keeper.
BHOFM's Avatar
Our, Kimber built it, Eagle 2 has a Powerup 32 Sport. The preformance is great. 4s 5000,

Feb 28, 2015, 10:53 AM
Learn to build with wood.
Tucci's Avatar
I originally had a Turnigy G46 on mine(PT40), ran it on 4 or 5 cells, props from 12x8 to 14x6 80 amp ESC from Heads up.
Now it has a 50-55 580kV with a 12x10 but I'm going to prop it up to 14 again.
Shoot for 600 watts max or so. It's a trainer after all.

I also took all the dihedral out.
Nov 10, 2016, 03:11 PM
Registered User
I have a Turnigy G46 laying around, a PT40 and an Ultra Stick 40 sitting around, and an itch to do something with 'em. How did that motor do on the PT?
I've also considered mounting a couple 2216s or the like to the wings, to free the nose up for a camera pod, like a smaller, simpler Gemini type UAV. It'd be a testbed, so wouldn't have to be perfect... unless it just worked REALLY well... then I'd go ahead and keep the 46 with the stick.

As to the battery pod, that's pretty cool. I'd considered something like that, but two of 'em for under the wingroots. I was thinking about keeping as much "cargo" area open as possible.
Nov 22, 2016, 08:10 PM
Out Standing In The Field
RexGalore's Avatar
My very first RC plane in the 80's was the PT-40, but I don't remember it very fondly. A friend gave me a very nicely built Trainer 40 (symmetrical wing) that I have a Power 46 planned for.

Velojym, you would have CG problems if you put battery pods under the wing roots, but your twin motor idea is a good one. I converted a Tidewater seaplane to a twin with great results.

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