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Post  JMynes on Sat Nov 26, 2016 10:31 am

I went to a party store to get a tablecloth, and while I was there I looked around for items that could be made into a pushrod shroud. Here's what I came up with:

Test tube shot glasses

Pushrod exit shroud Img_0010

These looked promising, and will work, but they're a bit brittle on the band saw. The bell mouth tends to split and shatter. They give a good variety of lengths depending on the angle you cut them at.

A kazoo and a pen

Pushrod exit shroud Img_0011
Pushrod exit shroud Img_0012

I know it's a party store, but what are they thinking? The last thing I would buy for a mob of kids is a bunch of kazoos.
But when cut at an angle, the kazoo gives a nice oblong shroud, although it's a bit shallow.
The multicolor pen, on the other hand, is just about perfect. Cut right down the middle and it gives you two nice covers. It requires just a bit of sanding to eliminate the small hole in the end. Hopefully it will take paint, I don't want a Batman theme on my plane.
In the past I have used plastic spoons, just cut off the handle and part of the bowl. They tend to be too small.
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Post  KariFS on Sat Nov 26, 2016 12:59 pm

Hey that kazoo might make a nice NACA duct too if you flip it over and mount it flush to the surface Very Happy

Pushrod exit shroud File%3ANACA_submerged_inlets
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Post  JMynes on Sat Nov 26, 2016 1:35 pm

What's a NACA?
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Post  KariFS on Sat Nov 26, 2016 1:46 pm

Oops, the picture didn't come through in my previous post, let's try again:

Pushrod exit shroud Image21

It's a shape of an air intake where you don't need a scoop that would generate drag.
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Post  Ken Cook on Sat Nov 26, 2016 5:25 pm


I use a blue Bic pen cap for pushrod exits
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