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Hi Lonnie,
Why I am certain you are correct
about the optimum length - err, for what RPM {:>).
There are a number of different polyurethane with
tailored characteristics ranging from looking like a block of aluminum,
machinable and takes a polish like metal to very flexible almost rubber
like consistency. I use one sold by this company called Featherweight (so
light if floats). Not being that knowledgeable about plastics I leave
plenty of thickness for strength - probably much more than required, but I would
rather not find the limits in flight. You need silicon cores in order to cast
runners in the plastic - well, I guess you could use just about anything, but
the silicone cores are reusable and easy to pull out of a curve. I
Its really sort of neat. I cast my first part
about six or seven months ago and used it to mount all four fuel injectors and
the throttle body. However, it turned out that having the four injectors
22" away from the ports made starting on cold mornings difficult. That and
I wanted to see if an adjustable intake manifold was worth the effort. If
it turns out to be worthwhile then I will use more plastic in the next intake
manifold to see how light weight I can get it.
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
Sent: Monday, March 01, 2004 1:20
PM
Subject: [FlyRotary] Re: EDDIE manifold
more photos
Hey Ed, Looks great! I am sure you will find the
optimum length manifold will be
the exact length I made mine :>)
.
Can you tell me about this pourable polyurethane?
Where did you get it?
How break resistant is it, such as in
bending?
Thanks,
Lonnie
.
So we hopefully will see what this does in a
couple of days. Oh yes, the throttle body mount was poured from
polyurethane plastic.
Ed
Ed Anderson
RV-6A N494BW Rotary
Powered
Matthews, NC
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