In a message dated 2/24/2007 7:55:29 P.M. Eastern Standard Time,=20 keltro@att.net writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>

Lynn,

And here I sit with a "Mistral" mount plate residing whe= re=20 the

stock front cover used to be on my 13B.......It allows the use of

a standard Lycoming "Dynafocal" mount ring to bolt my engine

to my "Dyke Delta".....What do you think are the chances of my

normally aspirated rotary from over-stressing its end-plates and

rotor housings......."Mistral" does have provisions for using a

four point bed type mount on the 13B (using their redrive) and

it is required on their 20B , three rotor=20 engine ......... Attached

photo is of "Mistral" 13B on a Glasair project of one the rotary

group, Steve Thomas in Calif.......Hope you do not mind Steve!!

--
Kelly Troyer
"Dyke Delta"_= 13B=20 ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold=20

Francios Had the reduction unit in the motor tent at Sun &= ;=20 Fun about 5 years ago, looking like a lost puppy. They had been trying to ge= t=20 the Piper to fly long enough without frying the oil so they could have it on= =20 display at the flight line. No dice. I talked to him for a very long time. H= e=20 took notes. They are all engineers, and trust math to get them out of=20 anything.

So they calculated everything, and on paper there would be enough oil=20 cooling to do the job.

Well that test location was in Florida before Global warming had died d= own.=20 I suggested best power was down around 160 degrees max, and he was sad.=20 The coolers were big enough. The flow rate was high enough. Airflow=20 through the coolers was high enough.

The oil temp would just slowly climb into the red 230-240-250 and land=20 again.

They didn't realize the Mazda pump was designed to work OK at 2,000=20 crankshaft RPM.

So, at 6,000 RPM it foams the daylights out of the oil. And air in the=20= oil=20 is an insulator, and the effect is that the coolers get smaller with time. T= he=20 oil pump has a front and rear segment and those are shaded just a bit to red= uce=20 noise. Both must pull suction oil from the back end so the number of sharp=20 corners the oil sees inside the pump is more than a normal pump.

Plus, the higher flow was unhappy with the tiny bug screen at the end o= f a=20 sharp edged tube in the pickup. So, there was a vena contracta problem.=20 So, they took off the bug screen and it started working well. They too= k=20 out the airplane oil and put in car oil Fewer polymers, and it worked better= .=20 They made up a dual pickup casting to feed both ends of the pump like the FD= oil=20 pump and everything is fine.

The point of the story is that the mechanical parts have many actual ho= urs=20 of flying in a real airplane in hot weather. So, it is thoroughly test in a=20= real=20 life situation.

Their front Iron and mount is thicker and stiffer than the stock stuff.= =20 There will be no problems.

Lynn E. Hanover

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