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

From: ben haas

To: Rotary motors in aircraft

Sent: Tuesday, August 03, 2010 6:16 PM

Subject: [FlyRotary] Re: Bad rotary week

I  agree with Tracy on this. You need to add apples to apples to get any kind of logical comparison.
 
On my V-8 conversion I often get the " it's too heavy" comment from the Lyc/Cont crowd. I politely point out the Lyc stated weight, 307 lbs, is for a bare 0-360. A lot of people assume that's the installed weight. They are so wrong. 
 
Fact...... I personally removed a 0-360 Lycoming with a two blade constant speed prop right out of a Piper.  I simply removed the mount from the firewall  with an engine hoist and a certified scale hooked to the engine/prop combo, and left EVERY thing it took to fly the plane. ie,  Motor, starter, alt, baffles, exhaust system, fuel system, brackets, prop, governer, you name it.  It was weighed just as it came off the airframe..........
 
457 lbs. !!!!!!!!!!!!!!!!!!!!!!
 
That's a LONG way from 307 lbs.

Ben Haas
www.haaspowerair.com



 

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To: flyrotary@lancaironline.net
Date: Tue, 3 Aug 2010 11:54:16 -0400
From: tracy@rotaryaviation.com
Subject: [FlyRotary] Re: Bad rotary week

Nope, that's weight of engine and required systems (cooling, redrive, alternator & starter).

.  Trying to define it in the same way that Lycoming defines their engine weight for comparison purposes.  eng mount, brackets, ducts, prop, mounting hardware, exhaust system, etc must be added for FWF weight.

Tracy

On Tue, Aug 3, 2010 at 10:44 AM, Kelly Troyer <keltro@att.net> wrote:

Tracy,

   

     Is 260 lbs your firewall forward weight ??...................

 

Kelly Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold

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From: Tracy Crook <tracy@rotaryaviation.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Mon, August 2, 2010 8:29:31 PM
Subject: [FlyRotary] Re: Bad rotary week

Hi Dwayne,
   I estimate I'm getting about 200 HP at 7200 rpm on the Renesis.  230 is probably the best you are likely to get when normally aspirated and then you will need to turn it a bit faster.  I went all out for weight reduction on my RV-4 so the engine & systems came out around 260 lbs.

OTOH, I'm getting about 270 effortless HP from the 20B at 6250 rpm.  Should get 300 if turned to 7000.   This install weighs about 90 pounds more than the Renesis though.

Tracy