Today's Message Index:
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1. 05:09 PM - Re: KIS TR-1 Propeller (BlueSkyFlier)
2. 05:27 PM - Re: 2010 Holiday trip (BlueSkyFlier)
Message 1
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| Subject: | Re: KIS TR-1 Propeller |
Hi OC,
Thanks for the info on your propeller performance.
Using the integrated airframe and propeller performance model which I created some
weeks ago now, I have already determined that the best solution for me will
be a 67 x 67 prop. Such propeller will also function optimally at 2300 rpm at
7500 feet for cruising. According to Lonnie the P-tip with 67 inch pitch will
flex to such an extent under load that it will effectively present a 63 inch
pitch during take-off/climb.
By the way, I found it puzzling that the Prince website talks about the propeller
diameter being a factor in the flat plate drag of the aircraft. Because the
propeller produces netto thrust which increases quadratically with diameter that
statement initially failed to compute in my mind. On the other hand however,
propeller parasitic losses do increase with diameter and rpm - so perhaps they
are implicitly lumping propeller parasitic losses into the overall zero lift
drag coefficient for the aircraft (and thereby also into the flat plate area).
I have not encountered such point of view before, but it is the only interpretation
which makes sense to me. One has to be very careful with that approach
though, because the airspeed multiplier by which drag converts into power is
of course completely different for the propeller and airframe.
It remains to obtain torque and thrust curves for a 67 x 67 propeller from Lonnie
Prince and his team to confirm that my postulated propeller blade model is
not too optimistic in terms of performance - nor too conservative.
Kind regards,
Alfred
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Message 2
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| Subject: | Re: 2010 Holiday trip |
Hi John (Jackson),
My closest field is Fairoaks, but the plane is still at Dunkeswell where I bought
it and am doing conversion training if the weather will give us a chance.
Regards,
Alfred
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http://forums.matronics.com/viewtopic.php?p=332347#332347
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