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From: "George Lendich" <lendich@aanet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-3761185@logan.com>
Subject: Re: [FlyRotary] Oshkosh Rotary Gathering / Intake tube length discussion.
Date: Fri, 17 Jul 2009 07:51:50 +1000
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Ben,
Did you ever come across a chap who built composite inlet runners, inner 
mould core, made up of a water soluble corn starch material.  When he was 
finished making the runners he just washed out the core with warm water. It 
was absolutely perfect on the inside. You would have to first make a mould 
to form the core, I think he used some flexible plastic tube, slit to enable 
it to come off easily, it was easily sanded and patched to mend 
imperfections.
Going by memory only now, but found it on the internet somewhere.
George (down under)
>
> All,
>
> How about Wednesday @ 11:00AM. Then, if we want, we can go get some food, 
> or just hang around and talk rotary. Someone suggested the Hombuilders 
> Headquarters. I will check for availability based on the number of people 
> that reply they will try to stop by. Please post if you think you may make 
> it.
>
> As far as the replies to my inquiry, some very good points brought up. And 
> I appreciate all the input. A few things I had thought of and worried 
> about, i.e. attaching to the mounting flange, and fuel and heat 
> resistance. One brought up FibreGlast, their carbon fiber sleeves is 
> actually what got me started thinking about it, and would likely use them 
> as my tech support on the actual construction. One brought up my current 
> intake looks good, and I appreciate that compliment, however, most 
> everyone installing a rotary in their aircraft knows, just because it 
> looks good, really doesn't do much for performance. I  am becoming more 
> and more concerned over the length of my intake runners, And the weight if 
> it. I have been weighing every piece from the firewall forward, and WOW, 
> adds up pretty fast. Not liking what I am finding. Nearly finished, and 
> will post those results when complete. My problem is, what is considered a 
> true FWF weight. Does the engine mount
> count? I say Yes. Does the spark plug wire count, Yes. I have weighed 
> EVERYTHING. Which leaves me to the Lyc crowd are they weighing EVERY piece 
> that is in front of the firewall? For a fair comparison, or just the 
> engine? My batteries are on the firewall, SO I weighted em. But what about 
> the Lyc. guys. If their batteries are behind the firewall, does that mean 
> they are not obligated to include them? Life s so unfair.
> I guess that is why I have weighed every piece separately and can add or 
> subtract accordingly.
> Wrapping up, thanks to all who responded, not sure if I will proceed or 
> not, should just work toward getting the thing flying before I start 
> redesigning it. Not sure IF I will proceed with the intake or not.
>
> Sorry for the delay in responding, I am on digest mode, and get them all 
> at once.
>
> Ben Schneider
>
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