Thanks Lynn, You make a good argument. I will probably come back to you at some point here and query more directly on the where's and the hows. For now I've got to stew on it all etc. Lots of that [thinking] going to be required in the future to make this all work.

 

Thanks again!

Jarrett Johnson
www.innovention-tech.com

----- Original Message -----

From: Lehanover@aol.com

Date: Tuesday, April 26, 2011 7:20 am

Subject: [FlyRotary] Re: Mistral 'Like' Intake

> The current layout obviously works and has been crash tested with
> good 
> results. The engine remained attached to the fuselage and in front
> rather than 
> being folded under. Well, for that particular crash anyway.
>
> I wonder who got the salvage?
>
> However, if you plan to start from scratch, you have an
> opportunity to 
> outperform Mistral. The most recent Mistral is not the first,
> although the name
> may have been different. I met Frances at the engine tent at
> Sun&Fun years
> ago. He had the reduction unit with him. He was excited to meet
> somebody
> who  knew stuff about rotary engines. Once they had relearned all
> about
> rotaries, and  had thousands of dyno hours built up, they had
> quite a package
> assembled. But  the certified nut is hard to crack, and I think
> both versions
> of the company  died trying.
>
> Perhaps building up a collection of products based on the rotary 
> installation rather than a complete unit that was about the cost
> of a zero time 
> Lycoming or Continental. You have to be able to point out some
> sort of advantage
> over the conventional engines. People who put car engines in
> airplanes do
> it  primarily for cost reasons.
>
> Having an installation testing here was another thing that escaped
> me.
> One year they had the plane flying, but the oil temps went up so
> high so 
> fast that it could not fly to Lakeland From Embry Riddle. So I
> made some 
> suggestions. Like don't use multi grade anything. Don't use multi
> grade
> aircraft  oils. Full of plastic and foams like crazy. That fills
> it with air, and
> then the  coolers stop working. Use straight weight car oil. Its a
> car
> engine. Racing oils  have lots of anti foaming additives lots of
> anti scuff
> compounds and very high  film strengths. Synthetics even better.
>
> Later they built their own oil pump housings and pickups. With
> suction 
> feeds from both ends like the FD pumps. No bug screen. The Baffle
> had the bug 
> screen in the drain back hole.
>
> At a constant 5,500 or 6,000 RPM, the bug screen and sharp ended
> pickup 
> tube add to foaming and poor suction side performance.
>
> Bigger coolers of course. You calculate the exact cooler size you
> need 
> then buy two of them. If you buy one, later you will need another.
>
> The other factor I saw was that the support for a governor invites
> the 
> addition of a 60 pound constant speed prop, a long way out from
> the mount. We 
> don't need the engine falling off in a hard pull up, or really bad
> bounce on
> landing. There is an established design factor for that. About 5
> Gs maybe.
> So,  here is a chance to improve on Mistral.
>
> Adding a few holes that need to be threaded is not a deal killer.
> Even if 
> you need to go to a shop and have it done. So long as the actual
> pieces
> become  available to builders. An idea that escaped Mistral.
>
> Lynn E. Hanover
> 
>
>
> In a message dated 4/26/2011 4:37:37 A.M. Atlantic Daylight Time, 
> hjjohnson@sasktel.net writes:
>
> Lynn, re: Strength of the Connection.
> I remember you stating some of those points a while back. I'm
> wondering if,
> in our lower power state, these are as much a concern as they are
> in the 
> racing world? It would certainly be possible to add extra parts to
> the
> install  [the thickened bottom plate, or perhaps some form of a
> stiffener that
> locks  the block from torque related movement front to back  { all
> just
> thoughts  flashing through my brain, RHRN}. I've not heard comment
> about how
> Mistral  addressed this [or if it was a concern of theirs?].
> Kelly, do you know of any additional connection points [dowels or
> pins etc]
> that were needed for the install of a Mistral housing? 
> It certainly is not my first 'pick' to have a mounting housing
> which needs 
> modifications to a short block, to allow it to be  installed.
>
>
> Jarrett Johnson
> _www.innovention-tech.com_ (http://www.innovention-tech.com/)  
>