42% EXTRA 260 Conversion???  
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42% EXTRA 260 Conversion??? - 12/31/2004 10:54:29 PM   
Sean Plummer


 

Posts: 60
Joined: 9/22/2004
From: , AZ, USA
Status: offline 		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. http://www.desertaircraft.com/engines_detail.php?Page=DA-150

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.

-Sean

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       Post #: 1

RE: 42% EXTRA 260 Conversion??? - 1/1/2005 1:07:23 AM   
pmmartin


 

Posts: 88
Joined: 3/23/2002
From: East Amherst,NY-Vero Beach, FL, USA
Status: offline 		Happy New Year! I am looking forward to this conversion as I really enjoyed the Composite-ARF Extra 330L Conversion. You did a great job and it was a very interesting conversion. Have you had the opportunity to fly the Extra any more?

(in reply to Sean Plummer)
       Post #: 2

RE: 42% EXTRA 260 Conversion??? - 1/1/2005 6:22:10 PM   
Sean Plummer


 

Posts: 60
Joined: 9/22/2004
From: , AZ, USA
Status: offline 		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.

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(in reply to pmmartin)
       Post #: 3

RE: 42% EXTRA 260 Conversion??? - 1/1/2005 6:23:54 PM   
Sean Plummer


 

Posts: 60
Joined: 9/22/2004
From: , AZ, USA
Status: offline 		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.

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       Post #: 4

RE: 42% EXTRA 260 Conversion??? - 1/1/2005 6:26:56 PM   
Sean Plummer


 

Posts: 60
Joined: 9/22/2004
From: , AZ, USA
Status: offline 		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.

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       Post #: 5

RE: 42% EXTRA 260 Conversion??? - 1/1/2005 6:28:31 PM   
Sean Plummer


 

Posts: 60
Joined: 9/22/2004
From: , AZ, USA
Status: offline 		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.

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       Post #: 6

RE: 42% EXTRA 260 Conversion??? - 1/1/2005 6:30:52 PM   
Sean Plummer


 

Posts: 60
Joined: 9/22/2004
From: , AZ, USA
Status: offline 		the model is filled and sanded with 1000 grit paper. The Monokote http://www.monokote.com/ 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.

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(in reply to Sean Plummer)
       Post #: 7

RE: 42% EXTRA 260 Conversion??? - 1/1/2005 6:32:23 PM   
Sean Plummer


 

Posts: 60
Joined: 9/22/2004
From: , AZ, USA
Status: offline 		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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       Post #: 8

RE: 42% EXTRA 260 Conversion??? - 1/1/2005 6:33:58 PM   
Sean Plummer


 

Posts: 60
Joined: 9/22/2004
From: , AZ, USA
Status: offline 		the fuselage is covered using large strips of monokote. Note: the long pieces curl up after cutting and need to be taped in place prioir to ironing.

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(in reply to Sean Plummer)
       Post #: 9

RE: 42% EXTRA 260 Conversion??? - 1/1/2005 6:35:25 PM   
Sean Plummer


 

Posts: 60
Joined: 9/22/2004
From: , AZ, USA
Status: offline 		The lettering for the model is cut out of monokote by hand using templates. Each letter is ironed down one by one. A lot of work but, the result is excellent.

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(in reply to Sean Plummer)
       Post #: 10

RE: 42% EXTRA 260 Conversion??? - 1/1/2005 6:37:07 PM  1 votes
Sean Plummer


 

Posts: 60
Joined: 9/22/2004
From: , AZ, USA
Status: offline 		Here is Yuri, with the completely covered model. The last steps will be the final motor/battery install and radio setup. These steps will be detailed shortly.

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       Post #: 11

RE: 42% EXTRA 260 Conversion??? - 1/1/2005 11:32:02 PM   
vatechguy3


 

Posts: 759
Joined: 4/5/2002
From: Suffolk, VA, USA
Status: offline 		any idea as to what the RTF weight will be??

thanks
tony

(in reply to Sean Plummer)
       Post #: 12

RE: 42% EXTRA 260 Conversion??? - 1/2/2005 1:52:55 AM   
Bill Mixon


 

Posts: 259
Joined: 8/24/2002
From: Kite, GA,
Status: offline 		Nice stuff, Sean
Yuri does some really nice building and finish work, as I have seen his other scratch builds. Not to mention he can then take it and fly it through some of the most aggressive "one the edge" maneuvers that you will see.
Is Yuri working on this out in AZ or is it in the northeast region?

(in reply to vatechguy3