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Sport Planes (Formerly I/C & Gas Conversion) Discuss I/C or Gas Conversions, Aerobatic Planes and Sport Aircraft

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Old 02-06-2006, 12:52 PM   #1
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Default Mitchell B-25 conversion

Has anyone converted this plane to electric power? http://www.kmp.ca/rcpics/b25/b25picspecs.htm

I'll be ordering this plane very soon and I intend to convert it to electric power, probably AXI motors. Not being one to try and re-invent the wheel, has anyone electrified one of these planes? Any pointers, tips or suggestions would be appreciated.

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Old 02-06-2006, 03:01 PM   #2
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At a greater than $600 price tag, I don't think you will find to many, but it should make an excellent conversion.

You may find some of the version HL used to sell:
http://www.hobby-lobby.com/b25.htm

Here are a couple from the eZone...but none of this exact model.

http://www.rcgroups.com/forums/showt...t=mitchell+b25
http://www.rcgroups.com/forums/showt...t=mitchell+b25

Let us know when you get the kit, and we can help you with some numbers.

I might also consider the Hyperion motors, they sure are impressive. At any rate, I will make an excellent conversion, but I hope you have a big wad of $$$.

Mike
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Old 02-06-2006, 08:50 PM   #3
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We are converting the KMP B-25 to electric, using 2 Hyperion Z4025-12 and Varioprop adjustable 15" 3-blade props. We have tested the setup and it will work just fine. We are also testing a 14" scale varioprop and a Master airscrew 14"9. We have also started to convert a KMP P-38 Lightning. In this plane we are going to use 2 Hyperion Z4035-10.
I will give you more details when we have made more tests.
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Old 02-06-2006, 09:10 PM   #4
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On the P-38, the AXI 4130/16 work fine with authourity w/14"/3blade prop. I talked to Hobby Lobby for the setup.
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Old 02-07-2006, 12:15 PM   #5
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Default B-25

Thanks for replies!

I contacted Hobby Lobby and it turns out that they electrified a KMP B-25 last year with a pair of AXI 4130/16's with Graupner 15X8 props.

Petsamo, is the Varioprop adjustable enough so that the motors can be counter-rotating? Also, how many and what kind of servos will you be using?

rcer's, I am busily spending my children's inheritance.

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Old 02-07-2006, 01:52 PM   #6
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Hello again, yes I saw the HL conversion, looked very good.
We are using standard servos exept for the elevator,which has a digital high torque servo.
I will tell you more when the project progress.
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Old 02-07-2006, 01:54 PM   #7
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Default Oh, I forgot..

about the Varioprops, they can be changed from 4-12 pitch. They have also left-handed props for contra-rotation.
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Old 02-07-2006, 02:23 PM   #8
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rcer's, I am busily spending my children's inheritance.
Good for you!!!

Keep us updated, what a fantastic project. The price isn't too bad considering the retracts are included.

Mike
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Old 02-07-2006, 03:17 PM   #9
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Default B-25

rcer, yeah, the included retracts make the price very reasonable IMHO. I was concerned that the shipping would be really bad but surprisingly, it's only $66 to Pennsylvania.

The other component parts will end up costing much more than the plane.

I do a special project for each grandchild (I get the wife's blessing a lot easier that way) and little Caleb is supposed to be the last grandchild so I'm going to do it up right.

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Old 02-07-2006, 03:25 PM   #10
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The other component parts will end up costing much more than the plane.
O yea....

I can't wait for grandkids. Well actually I can, but as my first (we have 4 kids) gets ready for college, I can tell that my budget will be severely impacted!

O well!

Mike
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Old 02-07-2006, 03:41 PM   #11
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Default College

There's a guy who lives locally here who named his access road "Easy Street". Some time ago he added a second sign to his "Easy Street" sign which read "Was Easy Street but Daughter's in College Now".

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Old 02-09-2006, 05:11 AM   #12
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Default Big KMP P-38 Conversion?

Have you converted the KMP P-38 to electric? If so, I'm dying to hear more as I just took delivery on the ARF and I'm starting to think about motors, ESC's, batteries and props. Please send your setup and some pictures! Its not a KMP B25 but many of the challenges are the same.
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Old 02-09-2006, 06:26 AM   #13
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Default we are doing both..

the KMP P-38 is converted with 2 Hyperion Z4035-10 and 2 HP TITAN 80 PO Speed Controller. The motors arrived yesterday and we are going to test 2 15" varioprop 3-blade with variable pitch. These blades have been tested on the Z4025-12 with very good results. We used 5s2p getting 9.7 lbs in prop static thrust.
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Old 02-09-2006, 12:27 PM   #14
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Sounds like plenty of thrust, what will your flying weight be? What is the battery size (Lenght x Witdth x Height ) and where will it be mounted (each boom I presume). I'd love to hear of your progress and some images would be great too. Who out there had experience with Axi 4130's in this P-38?
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Old 02-09-2006, 06:32 PM   #15
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http://www.e-flightline.com/

Check out the one they converted in the video section.

John
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Old 03-08-2006, 03:35 AM   #16
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Default Mitchell B25 conversion

I am just starting on mine. Let me know how you are making out. I am in a quandry as to whether to put retracts on the bird or not.I am installing two AXI 2814/10 and two jeti 30 Advance plus speed controls and will use a polyquest 4400 battery. It should fly well Jayree
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Old 03-24-2006, 03:49 PM   #17
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Default P-38 conversion using Axi motors

What battery setup are you using with the AXI 4130/16s in the P-38?
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