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From: Bulent Aliev <atlasyts@bellsouth.net>
Subject: Re: [FlyRotary] Re: Tips on tuning
Date: Fri, 3 Aug 2007 18:17:26 -0400
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

I used to have the same prop as Chris IVO Magnum 68" Diameter =20
inflight adjustable. I felt the 3 blade configuration used to lug the =20=

engine down. Changed it to two blade (did not want to cut the =20
blades). My takeoff RPM was 6,500-7000.
Buly

On Aug 3, 2007, at 4:15 PM, Mark Steitle wrote:

>
>
> On 8/3/07, Al Gietzen <ALVentures@cox.net> wrote:
>
> Al,
> I think Chris B. brought this up earlier today.  I didn't respond, =20
> but you mentioned it, so then couldn't resist the urge to comment.  =20=

> To refresh everyone's memory, I have a 20B with a 76" 3-blade =20
> constant-speed M/T prop.  So, I can dial in the prop speed desired =20
> and the prop controller does the rest.  With it set to 2500 rpm, =20
> I'm seeing 7000 engine rpm on takeoff rolls.  (What a sweet sound!  =20=

> It makes those Lycosaurus' sound like farm tractors.)  It will turn =20=

> about 6700 - 6800 during static runups.  But this is a c/s prop, so =20=

> your mileage may vary.
>
> Mark S.
>
>
>
> I have found that with my 66" dia =96 80" pitch prop my Velocity =20
> doesn't move until engine rpm is somewhere upward of 1500 rpm.
>
>
> I get about 5500 static with my 20B, and about 5600 on takeoff.  =20
> With adjustable pitch you will want to get some higher numbers.
>
>
> Hope you find this helpful,
>
>
> Al
>
>
>