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kahuna
Joined: 02 Feb 2007
Posts: 93
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fairlea(at)amtelecom.net
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 Posted: Thu Sep 06, 2007 7:53 am Post subject: 3 blade MT vs the Hartzell fat paddle 2 blade |
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Mike
Good data. From my flight tests on my HRII I felt that I dropped three to four knots going from the two blade Hartzell to the three blade MT. I did not, at that time, have the benefit of your prop clocking information so the difference in smoothness was worth the swap for me. Did you do any flight tests at lower rpms? Most of my cross country work is at 21 to 2200 rpm and 23”. Although I do not have data to support my feeling, I suspect that there is not as much difference in the two props at that power setting. Metal blades have the advantage of a thinner profile and it is possible that that as you drop rpms that is not as important. On my current EVO I have a three blade MT and I would really like to be able to try a two blade on the plane with the clocking change. I do have some experience with a three blade Hartzell and it is my opinion that it is also faster than the MT but this has not been proven by tests. The main problem with the three blade Hartzell is the additional 22 lbs which will work on a F1 but is too heavy for a HRII due to the landing gear geometry. Good work.
Tom Martin
From: owner-rocket-list-server(at)matronics.com [mailto:owner-rocket-list-server(at)matronics.com] On Behalf Of Michael W Stewart
Sent: September 6, 2007 10:39 AM
To: rocket-list(at)matronics.com
Subject: 3 blade MT vs the Hartzell fat paddle 2 blade
Thought you guys might be interested in some real world data on these 2 props.
Enjoy,
Mike
http://www.mstewart.net/super8/performance/propcomparisons.htm | Quote: | | http://www.matronics.com/Navigator?Rocket-List |
01234
06/09/2007 8:36 AM
06/09/2007 8:36 AM
[quote][b]
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kahuna
Joined: 02 Feb 2007
Posts: 93
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| Posted: Thu Sep 06, 2007 4:07 pm Post subject: 3 blade MT vs the Hartzell fat paddle 2 blade |
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No I did not go below 2200 rpm so I have no good data about that.
I would love to try the 2 blade hartz symetar. Hartz says its worth another 3 knots for me.
We could get together one weekend and have a prop swapping extravaganza! Too bad the spinners are different.
Best
Mike
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