John,

Thanks for the response. You are one that I was hoping would chi= me in.

It looks as if I will go sans ceramic bearings unless some additional = knowledge is provided. O course, I could get a wild hair and get 'em<= a> anyway, but I may be creating another, unkown problem, n= ot to mention a possible meaninless expense. I don't know if any of y'all have noticed but this can be a= bit expensive as a hobby <g>.

Yes, I followed your earlier turbo delimas. Yikes! =

I agree, it is difficult to know who is a "true" expert.&nbs= p; Various sources, such as forums, does provide data points that may lead = to solid useful information. A conscecious is nice and pr= ovides some reassurance, but it may all be dead wrong...so to speak. But, conventional reason can be a nice place to start.

I remember the discussion on the canardaviation site. = ; It was part of the archival research I have just been doing. The in= fo from rv6guy (turboguy....? or some such variation) wa= s very useful. Of course thread shift and downright hyjacking= was/is a problem there too. (the owner of the canard community seems, as n= ice a guy with good intent as he seems to be on his visits to my project wa= s particulary guilty of this....HEAR that Dust <g>....oh,= I doubt he would ever visti a rotary site <g>).

I too was provided great reassurance by the same choice being made by = the Grrls. I have learned to have faith in their knowledge and= skill. I loved meeting them a while back when they visited Houston.&= nbsp; Their pressance only reinforced my trust in their ability.

Hmmmmm, a visit to Albany...that may be doable. I really = appreciate the offer. Hmmmmmm?

All the best,

Chris Barber

Houston, GSOT

From: Rotary motors in aircraft [flyrotary= @lancaironline.net] on behalf of John Slade [jslade@canardaviation.com]
Sent: Wednesday, March 17, 2010 10:13 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Turbo Considerations....careful, its long

Hi Chris,
I can provide one piece of second hand information and a lot of sympathy...= .
With regard to the ceramic bearings, I was told that the extra expense wasn= 't necessary, and that the 'big shaft' had been proved to hold up on an air= craft, while no-one (he or I knew) had yet flown ceramic bearings.

On the sympathy side - I can relate to your agony here. After b= lowing two stock turbos and one modified hybrid (one of which was at 11,000= ' and took out my apex seals) I was, shall we say, under a little more pres= sure to get the decision right this time.

After studying turbo maps and specs and reading everything I could find, I = eventually took the same logic on the turbo choice that I did on the engine= rebuild and on aluminum welding - "this is something you learn to be an expert in over many years, no= t months. I do not have the time or tenacity to become a true expert in thi= s field, and I don't wish to employ the skills of an amateur (me) .... so I= need to use the skills of someone who IS a true expert." Next problem - how do you know who is a true e= xpert and who is just claiming to be one?

I came across a turbo guy on the http://canardaviation.com forum (the initial communications should be i= n the archive) who was flying a turbo powered Subaru and seemed like a true= expert. I think he's in Canada. He'd been "into turbos" all his = life and certainly sounded like he knew what he was talking about. I gave him all my specs in terms of engine, planned = flight regime and usage, and he came back with the list of goodies I now ha= ve. As with all critical recommendations, I checked with others whose knowl= edge I'd gained a healthy respect for. The Cozy Girrrls had independently arrived at almost exactly the same= choices, except that they wanted more power at higher altitudes than me, s= o they choose the 9.6 aspect ratio which would provide less on take-off, bu= t more over 18,000'. I had specified a max cruise altitude of 15,000'. Greg Richter also used a Turbonetics, bu= t without an auto wastegate. Leon in Aussie (another true expert who used t= o contribute heavily to this list) agreed that the specs and manufacturers = were appropriate. At that point I put all the agony behind me and purchased EXACTLY what I was told would = work. Thankfully (once I put the suction on the correct side of the wastega= te :) it did work and I've had no further turbo issues. The push in your ba= ck on take-off feels like a Porche. I do the take-off based on the manifold pressure keeping it below about 42= which equates to just over half throttle. I think the late great Pau= l Conner said it best after flying in Dan Crugar's 0360 powered Cozy IV, th= en taking mine for a high speed taxi test. "Wooooo!"

You, of course, have an advantage over me - You can follow and examine my i= nstallation. The cost of a commercial flight into West Palm (or Albany afte= r early May) would be minor compared to the value gained. You'd be welcome = any time.

Regards,
John

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