REFLECTOR: Prop performance

Scott Derrick scott at tnstaafl.net
Tue Nov 9 10:18:18 CST 2004


This is great news....

I assembled the case and cylinders on my TSIO520 rebuild last week.  
NACA's and other downdraft cooling stuff is bing shipped now from the
factory.

We'll be seeing how a fixed pitch Catto can deal with 320 HP!

Scott


> I thought I would pass along this info from Craig Catto.  He had told me
> earlier that he had worked up a prop design (fixed pitch) on the 540
> powered
> XL that was getting takeoff rolls only 100 ft more than an MT, climb rate
> not much less (don't remember the numbers), and as good or better top end.
> I had sent him a couple of shots of my cowl and prop spinner with his
> prop;
> and he sent the following:
>
>
>
> We had another XLRG 540 fly with my fixed pitch prop over this last
> weekend... another gear up MT loss... Less than $3K and he was back in the
> air with my prop, extension and spinner.... figures were with full fuel,
> 1100 feet ground roll, 1300ft. min climb and TAS 193KTS!!.. average in
> runs
> in several directions... the owner was writing Duane a letter tonight...
>
> There are sure a lot of rotary conversion guys out there, so will be happy
> to hear how your runs... even static, let me know..
>
> Thanks,
>
>
>
> Craig Catto
>
>
>
> It seems to re-open the question of whether the nearly $10K and 30 lbs
> extra
> for the MT is worth it.  I guess the comparison also needs to be made at
> 5000 ft on a 90F day.  I don't know the conditions for the data above.
>
>
>
> The photos I had sent him are attached.  I was quite excited after running
> with the cowl and spinner on to find considerable greater air flow drawn
> through the scoop and radiator in the cowl than I had expected at idle and
> taxi rpm levels, especially with my 6" prop extension.  Hopefully won't
> need
> auxiliary fan.  On the next runs (which won't be until the end of the
> month)
> I'll rig a water monometer and measure the negative pressure.
>
>
>
> Al
>
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