REFLECTOR: Fixed Pitch RPM Std. FG / MT breaking

Fri May 22 06:33:36 CDT 2015

Andrew,

It would be great to compare our performance.  I have a couple Catto props
for my Velocity (173-RG).  One is an older design Catto prop and is 66x74,
the other is a newer design (~3yrs old) and is 64x76.  With the older
(smaller diameter larger pitch) one, I get a static of 2300RPM.  With the
newer one, my static is only ~2050RPM.  Both get about the same top end - I
typically cruise at 2800RPM which gives ~175ktas.  Because I get quicker
take-offs with the older prop, I use it.  I've been thinking about sending
the newer prop back to Catto for re-pitching, but not sure what I'd ask
for.  At mid-range altitudes (7500'), I have to pull back the power (go way
LOP) to keep the RPM's below 2800.  At higher altitudes (12,000') I can run
normal LOP and get 2800RPM (this is with the 64x76 prop).

Always looking for more speed - I'm wondering if I could squeeze out a few
cruise knots with a slightly longer pitch prop than the 64x76, maybe
something that would give a 2200RPM static..

I've attached a graph of the different takeoff performance I've seen with
both.

Geoff

On Fri, May 22, 2015 at 2:33 AM, Andrew Judge via Reflector <
reflector at tvbf.org> wrote:

>  I ordered and received a Catto after my MT broke apart. Amazingly it
> took Catto only a few days to get it to me. Apparently there was one
> already built from them waiting for a buyer! It’s been several years since
> I ran a fixed (I used to have a Performance Prop). I know the Catto is
> rated up to 3200 RPM, but what do most pilots run their fixed-pitch props
> at?
>
>  I can get the Catto to 2800 RPM at 7500-8500 FT Wide Open Throttle. At a
> stand-still on the ground, it’ll get up to maybe 2,350 RPM. Definitely
> takes longer to get off the ground and getting used to on landing compared
> to the MT. The speeds are almost the same. I might see 2-3 KTS faster at
> 2800 RPM 7,500 FT on the Catto versus 2500 RPM WOT on the MT.
>
>  The MT was losing the SS rain guards on the prop tips. After about 400
> hours, one of the SS rain guards departed the airplane 1/2 way through the
> length of the blade, leaving a slight vibration. I landed the plane in
> Rome, GA and got a new Catto with a nickel leading edge. I’m going to get
> the MT rebuilt, assuming they can assure me this won’t happen again.
>
>  This isn’t common; actually the 1st time I’ve heard about it.
>
>  My specs are:
>
>  Std FGE
> IO-360 C1C
> MT MTV-18 (newer blade design) Electric prop
> Catto Replacement with nickel leading edge
>
>  Anyway, I’d like to know the RPM you cruise at and if you’ve had issues
> with the MT in the past. Thanks!
>
>
>
>      *Andrew Judge*
> President
>
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