LDM

My Feedback: (15)

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

tahustvedt

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.

LDM

My Feedback: (15)

Thanks for the info

tahustvedt

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.

tahustvedt

Made an aerial mast and cut out the tail gear doors.

tahustvedt

My homemade reduction belt drive. It will be mounted on 15 mm rubber vibration dampers, hence the raised lugs.

tahustvedt

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.

LDM

My Feedback: (15)

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

tahustvedt

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.

LDM

My Feedback: (15)

cool interesting sound

Chilipecker

My Feedback: (37)

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???

tahustvedt

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.

Chilipecker

My Feedback: (37)

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?

jeffk464

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?

Chilipecker

My Feedback: (37)

Mine didn't have a spinner....did yours?

tahustvedt

Mine came with a black spinner that looks totally wrong for a P-40.

I've been away for a few days so I haven't made any progress on my P-40. Today I spent ten hours at an airshow. http://www.bardufossairshow.com

jeffk464

I think the real cmp p40 came with a spinner while the copy didn't. I have the copy so, will need to get a spinner.

The 4.5" spinner looks real good in the picture, is the gap very noticable up close.

LDM

My Feedback: (15)

I have the spinner , dont plan on useing it because I have a saito 180 , its will destroy this spinner , plan on a $90 Gene Barton spinner .

tahustvedt

The 4.5" spinner leaves a noticeable edge (~1/16" wide) around the front of the fuselage so I would only use it temporarilly on mine. Since I have fited the gearbox and Soloprop soon than I expected I will have to make a new fibreglass spinner anyway.

LDM

My Feedback: (15)

the spinner with the CMP P40 is 4.75" , the problem is that 4.75 is not stock for many companies and if it is it will run you over $139 , tru turn has some

jeffk464

I definitely dont want to put $139 more into this project. I'm looking for cheaper alternatives and so far not having much luck.

tahustvedt

Be glad you're not living in Norway. The plane costs $500 here and that doesn't include the $100 shipping (cheapest option fromt he norwegian dealer, inside Norway).

LDM

My Feedback: (15)

Try ebay for the copies , you can get one from $70 to $150 .
I will sell my spinner if anyone is interested

tahustvedt

Here's a video I shot at the airshow yesterday if anyone is interested. Sadly the battery in my camera died just as it was getting interesting so that's why it stops so abruptly: http://www.enrarot.net/images/flyste...6/msms2006.wmv

jeffk464

I'm interested in the spinner, how much are you thinking about letting it go for. Also did you buy your kit off ebay, or is it a cmp?