Ok. It's a shame that Neil isn't on here to ask, since he designed the new drive.

Charlie

-------- Original message --------

From: Kelly Troyer

Date:07/26/2016 10:40 PM (GMT-06:00)

To: Rotary motors in aircraft

Subject: [FlyRotary] Re: New PSRU on the Horizon

Charlie,

   On your question about a 2.85 you need to send an e mail to Randy..........

Best

Kelly

On Tue, Jul 26, 2016 at 10:00 PM, Charlie England <flyrotary@lancaironline.net> wrote:

On 7/26/2016 8:41 PM, Kelly Troyer wrote:

Group,

   This will be of interest to the Group.........Randy Kempf of  http://www.rotarpower.com/ in collaboration with

Neil Unger of Australia is gearing up to produce a new PSRU  that would seem to eliminate any weak points

in Tracy Crook's popular RDx searies of PSRU's.........Check out his website and the PSRU page........  

 

Kelly Troyer

Hi Kelly,

Thanks for the update. It's great that a drive will be available again, but it's a shame he chose such a wide ratio. Hardly anyone will want to operate the engine at 8k rpm, and even if they do, it will need a larger diameter prop than most homebuilts can swing safely, due to ground clearance issues. More typical operating rpms down in the 6k range mean sub-1800 prop rpm, which begs an even larger diameter prop.

Any chance he'll offer the more conventional 2.85? (Something closer to 2.5 would be even nicer, to get prop rpm closer to the design point for most homebuilt airframe/engine combos.)

Charlie

--

Kelly Troyer
Dyke Delta_"Eventually"
13B_RD1C_EC2_EM2