KMP "Challenger II 80" - RC Groups
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Mar 26, 2007, 03:20 PM
WAA-08 Pilot Eventually
donjiskra's Avatar

KMP "Challenger II 80"

Anyone familiar with this beautiful model?

They say it can be E-powered:
"Designed for gas, (40-52 two cycle), This model makes it an excellent candidate for electric power.The reason for this is it's very light airframe weight (7 to 8.5 lbs), and the need to put 'pilot weight' (lead or batteries) forward to simulate the real weight and balance."

Perhaps someone has done it???

Thanks for your reply,
Last edited by donjiskra; Mar 26, 2007 at 03:29 PM. Reason: add photos
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Mar 26, 2007, 07:10 PM
E-flyer since 1981
Michael in Toronto's Avatar
There is an owner of a local hobby shop (Ron) who is building one with an E-Flite 46 brushless motor. He says it will balance well with batteries in the nose, but he has to drill out the lead weight that comes in the nose.

He doesn't use this website, so I guess you can call him, if you want.

Pinnacle Hobby
5970 16th Avenue
Markham, Ontario, Canada L3P 7R1
(905) 471-9634
Mar 27, 2007, 05:07 PM
Registered User

We recently did an E-conversion for this plane at Hobby Lobby, below is our setup. We will have video of this up shortly, but this system works beautifully and will fly the plane very well for over 10 minutes. One of the keys to this working so well is the Aeronaut 3 bladed prop. It is a folding prop but we locked down the blades. The 1" prop that we are running is just about a large as this plane can use.

1 PM282612 AXI 2826/12
1 PM282002 Radial Mount
1 SPIN44 44A Jeti SPIN
4 HTS322 HS-322 Servos
1 RCD120 Electron 6
1 RCDXT_ _ Crystal
2 HT0604 12" HD Servo ext.
1 HLAN5525 40mm 3-blade spinner
1 HLAN4232 3-Blade Middlepart
2 HLAN3428 10x6 Prop Blades
1 DEA1300 Deans Ultra
1 FMAC03S Series Connector
2 PQ50002 2 Cell Lipo Packs
1 GR3389 2.5mm wire

Have fun,

Mike Hines
Mar 28, 2007, 07:18 AM
WAA-08 Pilot Eventually
donjiskra's Avatar
Hey Mike, that's good news!
Appreciate your very helpful informative reply.
Look forward to the video and availability to your product line.
Mar 28, 2007, 05:51 PM
Registered User
I just posted a video of the Challenger II

check it out.

Mike Hines
Apr 03, 2007, 09:56 PM
Vagabond324's Avatar

sweet flyer

Originally Posted by Hiflyer
I just posted a video of the Challenger II

check it out.

Mike Hines
Hi Mike, that's one sweet flyer. Do you think it needs 2 2s1p 5000 Lipo's? I have a 4s1p 4000 mah Lipo that I was thinking of using for this setup. Thanks, The Vagabond , Jon
Apr 04, 2007, 09:47 AM
Registered User

You could easily use the pack that you have. We balanced the plane with the packs back in the fuselage quite a bit, so balance should not be a problem. Flight times should also be acceptably long with your packs.

Good luck

Mike Hines
Jul 20, 2007, 12:54 PM
SlowStick Test Pilot
patrickegan's Avatar

I have few questions if thatís okay? (Electric version) What the AUW and normal flying duration(s)?

Thanks, Patrick
Jul 22, 2007, 11:19 AM
Registered User

The ready to fly weigh of ours came out at 8-1/4 pounds. At that weight the model is a joy to fly and performs very well. One of the keys to the good performance with this electric setup is the Aero-Naut three bladed folding prop. We screwed the blades tight so they do not fold. The Aero-Naut blades are very efficient and the 3 blades are necessary to absorb the power and turn it into thrust. Since you do not have the option of going to a larger diameter, due to interference with the tail boom, more blades at the largest diameter that you can use is the option of choice.

While there are fixed 3-bladed props available, most are designed for glow power and are not all that efficient in electric motor use, the Aero-Naut works very well.

Hope this helps,

Mike Hines
Jul 22, 2007, 11:29 AM
SlowStick Test Pilot
patrickegan's Avatar
Thanks Mike, but was 10 min all you got out of the 2 batteries (Normal flying)?
Jul 30, 2007, 06:25 AM
The simplest, the better!
pdemon's Avatar
I've just bought this model and I'm starting to built it. A disappointig thing (thinking about an electric conversion) is all that lead, almost 20 ounces, that has been glued in the nose with epoxy and microballoons. It's nightmare to remove it. I ended cutting the nose just half an inch from the front gear former. I'll remove the lead and then reinstall the nose, using it as an access hatch for lipos or telemetry equipment.
Another upgrade is changing the tiny wheels with some "tundra" ones: I already have installed main gear 3 3/16" balloon air type wheels. For an aerial photography workhorse, I think this plane is a good starting point.
Jul 30, 2007, 09:11 AM
SlowStick Test Pilot
patrickegan's Avatar
We're on the same page. Did you order the one from Hobby-lobby or KMP?
Jul 30, 2007, 01:58 PM
The simplest, the better!
pdemon's Avatar
I ordered it in Europe from
Buying it from the States was too expensive.
Here are a couple of pics of the first mods
Jul 30, 2007, 07:13 PM
SlowStick Test Pilot
patrickegan's Avatar
Jul 30, 2007, 08:39 PM
"Each Day Is A Lesson"
diver don's Avatar
Good looking bird.

Does the one from HL have the lead in the nose?



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