nnP-39 XXL

[HilldaFlyer]

There was sun above the fog.

 

[shiitake]

really

 

[shiitake]

Today I crash landed my 3m (120") nnP39 due to engine failure.
Because of the gas struts hardly any damage! (one rivet popped out).

To fun not to share this picture though.



Greetings from Holland!

 

[nerdnic]

Love it! Now that's a photo of a plane that's seen a lot of air time

 

[HilldaFlyer]

Even the sheep are staring! Wonder what they were thinking - the sky is falling, the sky is falling...

 

[foamtest]

That's a pretty strange definition of sunny they have...

I think they use the same definition in Cleveland, we probably see the sun about 3 times a year!

 

[FoamyDM]

Spectacular!

It looks like you reinforced the engine area a bit. any pics of that?

 

[varg]

The landing gear and exposed cylinder heads make this plane look very rugged! Awesome project.

 

[shiitake]

Spectacular!

It looks like you reinforced the engine area a bit. any pics of that?

It's a new cowling. I made if from glass-fiber, the other cowling passed away.

The original engine mount is still there. Dunno if I ever made pics of that but never had problems with it, neither on my other two foam-gas planes.

 

[shiitake]

Sorry guys... can't get enough of it.

PS I am the guy at the utmost left.

 

[Kunphushun]

Idk how I missed this. Excellent build. Any updates in the last month?

 

[Kunphushun]

Can you provide any details of how you filled the wings with poly-foam?

 

[shiitake]

Can you provide any details of how you filled the wings with poly-foam?

Sorry for the late reply.

I used quality poly foam, a friend gave it to me.



It says on the cylinder that it will expand only 2x after you have put it in and that is reasonably true.
I do not think its possible with the other cheap stuff I can buy here in Holland. That goes ballistic after you put it in for up to an hour or even longer! You need the quality type of it I think.

Anyways. I made about 8 square over the length of the wing, about 1x1 inch the Peter Sripol way. Have the knife in a 45° angle when you cut.
You can then glue the pieces you removed really nice back in later. The idea was to have the holes relief the pressure when the foam expands and that worked well.

For this big wing it totally did the job. Without the foam it would be too flimsy. Now it is really tough!

Cheers

P.S. It also works nice in your tail section when you have too much torque.

 

[shiitake]

Well, made a mistake. The plane, because of its size seemed closer than it was in reality.
I am not sad, it was too big to store and I was thinking on how to get rid of her. Now it's easy.

The salvage squad.

I like the look of crashed nn-P39's

And I was scared I did not make the wings strong enough!

It was a lot of fun to build but flying... I think 1.6 to 2 meter is a more fun size.
Smaller planes need smaller engines to fly fast. I'm thinking of putting this 120CC DLE into a 2.2 meter plane.

 

[rockyboy]

A noble end for a beautiful project! Congrats!