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1. 08:05 AM - Re: RV10-List Digest: 2 Msgs - 08/22/04 (LessDragProd@aol.com)
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| Subject: | Re: RV10-List Digest: 2 Msgs - 08/22/04 |
--> RV10-List message posted by: LessDragProd@aol.com
Hi Scott,
Since Van has the only RV-10 flying, and hasn't had time (or whatever) to do
any performance comparisons, I don't have an empirical data answer.
Assuming the MT and brand H propeller are designed for the performance
conditions, they should performance about the same. The assumption here is that
brand H was designed to the Lycoming 540 engine on a RV-10.
In general, the 2 blade propeller cruising at high RPM at, or below, 3,000'
MSL should have the cruise performance advantage.
At about 7,000' MSL and above, the 3 blade propeller should have the cruise
performance advantage.
The MT propeller requires the normal leading edge inspection during the walk
around.
There is no required maintenance at the 12 month condition inspection.
Both the MT and brand H propellers have passed the same testing requirements
for certification. They are equally good in rain and ice impact. (I sure
hope I never have an opportunity to check out ice impact in actual flight.
The leading edge on the RV's probably won't pass that test.)
If you plan to fly your RV-10 IFR, Gray colored blades are the preferred
color.
On brand H, as the paint at the very leading edge of the blade is removed by
the rain, it exposed the aluminum which is the same color.
On the MT propeller blades painted Gray, as the rain causes the same thing
to happen, it exposes the Gray primer which is the same color.
One of the items you didn't ask about was cockpit comfort. The 3 blade
propeller removes a 2nd order harmonic that is present with a 2 blade propeller.
This I have experienced myself in a Harmon Rocket 2. The 3 blade propeller
was significantly smoother than the 2 blade propellers. (The performance
testing involved a 3 blade propeller and two different 2 blade propellers.)
I hope this helps.
Regards,
Jim Ayers
Less Drag Products, Inc.
In a message dated 08/22/2004 11:58:45 PM Pacific Daylight Time,
rv10-list-digest@matronics.com writes:
--> RV10-List message posted by: "Scott Schmidt" <sschmidt@ussynthetic.com>
What are the expected advantages of the 3 blade MT vs. the 2 blade Hartzell
other
than weight?
What are the differences in climb? cruise? maintance? durability?
Thanks.
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