Mailing List flyrotary@lancaironline.net Message #62102
From: Charlie England <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Prop
Date: Mon, 21 Sep 2015 10:29:13 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Ouch! I lost a T-18 to a tornado once, but losing one to your mechanic sounds even more painful. Sorry for your loss.

There are several good prop makers out there, but if I were in your position, I'd start with Sensenich.
http://www.sensenich.com/

They have made props for just about everything imaginable, and their prices on wood props have been very competitive in the past. And with honest info on airframe performance, HP of the engine, prop diameter limit, and prop rpm range, they will likely come pretty close on 1st try. Biggest issue is likely to be diameter vs rpm. With a 3-1 reduction, it will be turning pretty slow, which normally means a large diameter prop. I don't think they make 3 blade props for our HP range, & you may need one.

For 3 blades, http://www.cattoprops.com/ has a great rep with Lyc guys, but be sure he understands your operating parameters.

http://performancepropellersusa.com/ is also good, and likely cheaper than Catto.

Charlie


On 9/20/2015 9:04 PM, GEORGE PUTNAM wrote:
Yep. I will be flying exclusively off the pavement. I have a 68” club on there right now. What takeoff and cruise rpm did you calculate for the engine?
My mechanic totaled my Stinson today! NOT a good cay. Yikes.
George
On Sep 20, 2015, at 2:39 PM, Ernest Christley <flyrotary@lancaironline.net> wrote:

The ratio is 3.12.  And the prop will be limited to 68" due to clearance.  You can go more, but I had the grass chew up the tips in the one I built that length. :-7



On Sunday, September 20, 2015 6:21 PM, Kelly Troyer <flyrotary@lancaironline.net> wrote:


Welcome to the Rotary World George..........What is the re-drive ratio of Ernest's conversion......... I knew 
at one time but it has slipped away..........That ratio and what rpm you are willing to use will have a lot to 
do with the prop selection.......

Kelly Troyer 

On Sun, Sep 20, 2015 at 11:56 AM, GEORGE PUTNAM <flyrotary@lancaironline.net> wrote:
Ernest made it impossible for me to pass up his nearly completed Dyke Delta. So basically I am just starting in the rotary world. For now I am figuring out Megasquirt and   Asking the group to opine on a prop. Looking forward to responses. The Dyke made a 4500 mile road trip to get to my hanger.
George

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