RE: CMP 73" P-40 kit bash  
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RE: CMP 73" P-40 kit bash - 6/5/2006 1:31:20 AM   
LDM


 

Posts: 4959
Joined: 5/29/2003
From: Denver, PA,
Status: offline 		Wydah , I plan on useing flite skin on mine , I just did this on a Seafury and the flitetskin is so thin , warp resistant , and when you add ribs its as strong as carbon fiber .

I am very curious on the hindge set up , did you add an internal crossbrace in the wing so that the hinges had a place to catch ?

Again , thanks for the answers you did a great job

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LDM

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RE: CMP 73" P-40 kit bash - 6/5/2006 12:50:02 PM   
tahustvedt



Posts: 380
Joined: 1/28/2004
From: Bardufoss, NORWAY
Status: offline 		I glued 3x10 mm hard balsa under the edge of the wing between the ribs and cut a hinge slot diagonally down so that the hinge point ended up at the skin. The flaps are built up 2 mm balsa with 3 mm ribs and a 3x12 mm leading edge beam. I used 2 mm balsa between the ribs to make a box structure in the forward 1/2 so they're pretty stiff and very light. I used three heavy duty pinned Du-Bro hinges on each flap.

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       Post #: 27

RE: CMP 73" P-40 kit bash - 6/7/2006 4:48:46 AM   
LDM


 

Posts: 4959
Joined: 5/29/2003
From: Denver, PA,
Status: offline 		Thanks for the info

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LDM

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RE: CMP 73" P-40 kit bash - 6/7/2006 10:16:37 PM   
tahustvedt



Posts: 380
Joined: 1/28/2004
From: Bardufoss, NORWAY
Status: offline 		Not much progress. The flaps are connected to the servos and operate nicely, I also cut out the cockpit sides and made balsa ledges and a cardboard instrument panel shield. Then I mixed some paint and brushed it on. I'm not going for scale perfection, just a plane that looks right to me. Eventually I'd like to recover and paint the plane in a grey/green british scheme.

I ordered parts to make my own belt reduction-drive to drive the big Soloprop so that will be interesting.

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RE: CMP 73" P-40 kit bash - 6/12/2006 7:39:48 PM   
tahustvedt



Posts: 380
Joined: 1/28/2004
From: Bardufoss, NORWAY
Status: offline 		Made an aerial mast and cut out the tail gear doors.

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RE: CMP 73" P-40 kit bash - 6/14/2006 7:10:51 PM   
tahustvedt



Posts: 380
Joined: 1/28/2004
From: Bardufoss, NORWAY
Status: offline 		My homemade reduction belt drive. It will be mounted on 15 mm rubber vibration dampers, hence the raised lugs.

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       Post #: 31

RE: CMP 73" P-40 kit bash - 6/14/2006 9:43:36 PM   
tahustvedt



Posts: 380
Joined: 1/28/2004
From: Bardufoss, NORWAY
Status: offline 		It is quite serious looking.

The gear ratio reduces the prop RPM at 1300 W to 4160 rpm, so I shoul dbe able to spin the 20" three-blade. I have pinions to achieve a slightly lower and slightly higher gear ratio as well.

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RE: CMP 73" P-40 kit bash - 6/14/2006 10:31:36 PM   
LDM


 

Posts: 4959
Joined: 5/29/2003
From: Denver, PA,
Status: offline 		Holy cow , for lack of the what I want to say , great job , that is a serious piece of equipment , at first i thought you were crazy going with e- power but not anymore

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LDM

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       Post #: 33

RE: CMP 73" P-40 kit bash - 6/14/2006 11:18:03 PM   
tahustvedt



Posts: 380
Joined: 1/28/2004
From: Bardufoss, NORWAY
Status: offline 		Hehe. I only fly electric.

I have an ESM (KMP) Spitfire that I have converted to electric. The P-40 should be lighter than the Spit:

http://www.enrarot.net/videos/spitfire/spitfire06.wmv
http://www.enrarot.net/videos/spitfire/spitfire08.wmv


The reduction drive fits in the nose perfectly. The motor is conveniently positioned behind the intake on top of the nose so cooling should be good. I may have to add some fibreglass around the box.

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RE: CMP 73" P-40 kit bash - 6/15/2006 12:51:59 AM   
LDM


 

Posts: 4959
Joined: 5/29/2003
From: Denver, PA,
Status: offline 		cool interesting sound

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RE: CMP 73" P-40 kit bash - 6/16/2006 1:02:11 PM   
Chilipecker



Posts: 185
Joined: 11/8/2003
From: Dallas, TX, USA
Status: offline 		The motor and gear reduction unit looks great! I have never flown electric, but after seeing and hearing the video of your Spit, I am inspired!

Any chance you could post templates and a parts list for the power unit???

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LOOK!!! There they go.... I must hasten after them, for I am their leader!

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       Post #: 36

RE: CMP 73" P-40 kit bash - 6/16/2006 4:40:48 PM   
tahustvedt



Posts: 380
Joined: 1/28/2004
From: Bardufoss, NORWAY
Status: offline 		If I were to build another belt drive I would choose smaller pulleys to save weight, maybe try plastic pulleys instead, and make the assembly a little smaller. I made it tall and used a long belt to get the motor positioned by the air intake. I used big pulleys to make sure lots of teeth were engaging but the pulleys are heavier than I thought they would be.

http://www.sdp-si.com/

Parts:
Shaft: S40PX0MHG6M-100
Belt: A 6R53M067060
Pulley: A 6A53M028DF0606
Pulley: A 6A53M045DF0606
6x12x4 mm ball bearings.

Here's a CAD drawing of the parts: http://www.enrarot.net/images/belt01.zip


Later I might make a counter-rotation gearbox for my Spitfire using both gears and belt reduction.

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       Post #: 37

RE: CMP 73" P-40 kit bash - 6/23/2006 7:02:25 PM   
Chilipecker



Posts: 185
Joined: 11/8/2003
From: Dallas, TX, USA
Status: offline 		THANKS FOR SHARING!

Sorry to take so long to thank you. I looks really innovative and I plan on doing the research this weekend.... I am having a problem opening the CAD drawings, I can't seem to figure out what opens a DXF file! Can this be converted to Adobe or something common?

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LOOK!!! There they go.... I must hasten after them, for I am their leader!

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       Post #: 38

RE: CMP 73" P-40 kit bash - 6/23/2006 7:59:24 PM   
jeffk464


 

Posts: 1240
Joined: 10/31/2004
From: cerritos, CA, USA
Status: offline 		I noticed a lot of you guys are not using the spinner that came with the kit. Is anyone interested in selling one of them?

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