flyrotary@lancaironline.net Mailing List Archive

Message

Best power, sea level standard day, 2 rotor and assuming the prop load permits engine to reach this rpm.

3000 - 86HP

3500 - 100HP

4000 - 115HP

Would seem reasonable for an RV-3 and loosing 41 lbs with no PSRU should made this even better. Go for it Rusty!!!! If not thing else you could prove Tracy wrong {:>)

Don't bring any of that white stuff back to this neck of the woods with you - ya hare?

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

From: Russell Duffy

To: Rotary motors in aircraft

Sent: Sunday, March 09, 2008 4:13 AM

Subject: [FlyRotary] Re: direct drive- was Re: Anyone have an RD-1C for sale?

Sure, that can work but why not something completely different?   I want to see someone do a direct drive 2 rotor (maybe even turboed) in the right application and the RV-3 comes close.   That would be Kool!

Hi Tracy,

Thanks for the comments, but you're not suckering me into this direct drive idea :-)

You've mentioned this before, but I just can't see the benefit. How much HP would a 2 rotor make at 3000, 3500, and 4000 rpm? Anyone got a power chart handy? Limiting the rpm of a rotary to direct drive speeds just seems unnatural to me.

Another point about the single rotor is that I'm trying to make the RV-3 Sport Pilot compliant, and that will be easier to justify with a smaller engine.  Fortunately, I don't foresee any medical issues, but I'm also fooling myself into believing this will be my last airplane. Please keep the laughter to a minimum :-)

Rusty (heading south in less than 5 days)

PS- Just shoveled about 1000 lbs of snow from around the van. I can easily see how people have heart attacks doing this. And yes, still with Philips, but we just changed our name to Philips Healthcare.