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Dec 31, 2004, 05:09 PM

42% Extra 260???

Today I will begin posting the details of very Large Electric conversion project. The Model is actually an ARC Almost-Ready-To-Cover VON EXTRA 260. The standard powerplant is a Desert Aircraft DA-150 150cc gas engine.

This plane is well know in the IMAC/TOC competitions.This model was chosen for it's very light weight and compatibilty for electric conversion. This all laser cut Balsa design has great flight characteristics for both Pattern and 3D.

The plan is to detail the main steps, and not every detail of the models construction.

123" wingspan
38-40 Lbs with 150cc Gas RTF.

Last edited by Splummer; Dec 31, 2004 at 05:17 PM.
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Dec 31, 2004, 05:43 PM
Lance Armstrong- 7 times!
flybike's Avatar
That thing is awesome!
I'm looking forward to seeing the power plant you put in it.
Dec 31, 2004, 06:08 PM
Registered User
rmm's Avatar
Hey, I got one of them. This should be interesting!
Dec 31, 2004, 06:17 PM
Registered User
BandDButton's Avatar

Just when I thought we had tapped out on how big we could go, you pull this one out of your bag of tricks.
This should be exhilirating to say the least.

Darrell B.
Dec 31, 2004, 06:41 PM
Shortman's Avatar
None better to get then the lightest 40% out there.
Dec 31, 2004, 07:33 PM
Molybdenum Member
I have a picture of a 40%'s power system in my avatar. It must have a really cool sound.
Dec 31, 2004, 09:05 PM
Involuntary Beta Tester
How do you think it will perform compared to the DA 150? I think this is pushing the limits of electric conversion if not exceeding them but this will be interesting to see if you can pull it off. Good luck.

Jan 01, 2005, 08:51 AM
Forgot how to fly
Mike Parsons's Avatar
Very interesting Sean. You have your own little version of Monster Garage .. I hereby title it Monster Hanger. I think this exceeds the normalcy (is that a word?) of the average modelers conversion..but it is cool to see it done. Look forward to the finished product.

Jan 01, 2005, 09:33 AM
Name it, I've crashed it
Bill Germanson's Avatar
Sean, When you can please set something next to your extra so we can get a sense of it's size.

Great project, thanks for sharing.

- Bill
Jan 01, 2005, 09:38 AM
thanks for your replies, this is definitely pushing the envelope for electric power!

The actual covering and radio install is being performed by Unlimited Aerobatics Pilot and Master Builder Mr. Yuri Higuchi.

here are the motor details: 4ea. Hacker C50+planetary connected to a belt type gear reduction. The plan is to run each motor at about 65 amps. here is a pic of the motor assembly being test fit.
Jan 01, 2005, 09:45 AM
The model incorporates "quick release" latches for both the split cowling and the canopy. Here are the pics of the Cowling hatch release mechanism. also shown is the wood parts that include the motor mount, and cowling frame to support the quick release mechanism.
Jan 01, 2005, 09:51 AM
the battery tray is located just below the normal Fuel tank position, and is on the same plane as the motor box, this will allow the batteries to be moved for and aft for C/G adjustment. All parts are made using aircraft and lite plywood. Note: The battery tray is supported at the sides and at the bottom using a brace as shown.
Jan 01, 2005, 09:58 AM
The canopy frame is fitted and modified with a "quick release" latch to allow easy access to the batteries. Note: The clear canopy is actually mounted into a fine groove that has been sanded in to the balsa, this will allow for a nearly seamless fit.
Jan 01, 2005, 10:06 AM
the model is filled and sanded with 1000 grit paper. The Monokote covering as chosen for its easy use and longlasting qualities. Here the parts are getting covered, using paper templates each piece of monokote is hand cut and applied.
Jan 01, 2005, 10:10 AM
with the rudder covered the rudder control horn is installed. a Double Carbon pull-pull horn assembly is custom fabricated and installed as shown

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