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Anyone made an exhaust flapper for one of their models?

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Sprocket

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This is the one I made for my version of the Zero-6 ( picture to the left.)
Look at Mark's Holt 75. He made a really nice one from GBritnells drawing.
Mine ended up feeling a little clunky, but it was probably 10 years ago I made that, and I like to think I'm better at it now...
Doug

IMG_0809.JPG
 

JimDobson

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This is the one I made for my version of the Zero-6 ( picture to the left.)
Look at Mark's Holt 75. He made a really nice one from GBritnells drawing.
Mine ended up feeling a little clunky, but it was probably 10 years ago I made that, and I like to think I'm better at it now...
Doug
G'day Doug and thank you. Not knowing much about these at all, I take it that the part circled below from your pic is a counterbalance?

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Sprocket

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Yup. too heavy for the exhaust without it I think. Just used a WAG* for the size, it looked right and it worked. Also, without a little counterweight, they close too fast and bounce.
IMG_0808.JPG



*wild ass guess
 

Stefan-K

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Anyone made an exhaust flapper for one of their models?

Do you have any photos you can share?
Here are 2 photos of my flapper which i have on my Lil`Brother and the Plan to make it. Don´t know anymore where i have the plan from. I believe its from the Tiny IC build log, but i`m not sure... anyway it works good and is nice to watch.
 

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Brian Rupnow

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You will find that on a small i.c. engine, these things rattle like Hell. On a big truck or tractor you don't hear the noise they make, but on a small engine they are very noisy.
 

gbritnell

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Here is the drawing I made for my Holt engine. I made mine from aluminum but it could be made from anything, brass, steel. Mine doesn't make any perceptible noise while the engine is running.
 

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