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Electric Stunt => Gettin all AMP'ed up! => Topic started by: John Rist on October 22, 2016, 12:03:54 PM
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What is the difference between a APC 11x5.5MRP Multi Rotor Pusher Propeller and a APC 11x5.5E Electric Propeller. I understand that one is a pusher. APC doesn't make 11x5.5EP. Is the APC11x5.5MRP really the same thing just being hyped for the Multi Rotor market?
???
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What does APC tell you to pair it with? If it's paired with the 11x5.5E, then there's a good chance that it's equivalent.
I seem to remember that the multirotor props tend to be more lightly built -- someone went to the Worlds in Poland with a plane flying a multi-rotor prop and ended up with a destroyed airplane after an encounter with a tuft of grass ('tuft' being a misnomer -- apparently the practice field in Poland had 'tufts' in heroic proportions). Again, as I remember it, he hit a hunk of grass and fractured a blade at the hub which subsequently broke, and the resulting imbalance tore the plane's nose off, much to its detriment.
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What does APC tell you to pair it with? If it's paired with the 11x5.5E, then there's a good chance that it's equivalent.
I seem to remember that the multirotor props tend to be more lightly built -- someone went to the Worlds in Poland with a plane flying a multi-rotor prop and ended up with a destroyed airplane after an encounter with a tuft of grass ('tuft' being a misnomer -- apparently the practice field in Poland had 'tufts' in heroic proportions). Again, as I remember it, he hit a hunk of grass and fractured a blade at the hub which subsequently broke, and the resulting imbalance tore the plane's nose off, much to its detriment.
Actually the do have a 11x5.5 multirotor in standard and a pusher. Just about all MR prop sets come as two standard and two pusher.
In the above disaster I am guessing that a KR timer would have saved the day.
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I don't know if a KR timer would have sensed the problem -- I'm not sure that the prop actually stopped when it hit the grass, or just got fractured. Certainly when the prop threw a blade the timer wouldn't have sensed it.
Howard Rush was thinking of using something like a TUT to sense the extreme vibration of a thrown blade and shut the motor down, but it's not exactly an everyday occurrence.
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I don't know if a KR timer would have sensed the problem -- I'm not sure that the prop actually stopped when it hit the grass, or just got fractured. Certainly when the prop threw a blade the timer wouldn't have sensed it.
Howard Rush was thinking of using something like a TUT to sense the extreme vibration of a thrown blade and shut the motor down, but it's not exactly an everyday occurrence.
The KR timer looks for a reduction in RPMs. If the motor/battery combination is able to maintain RPM while swinging one blade you are correct - it would not shut down. That would be very bad indeed. HB~> Although not all that common a 2.4 ghz cutoff would be nice. I read somewhere else that a one button 2.4 ghz clicker would be wonderful as a kill switch. I thing they were looking for it to be used on a gaser.
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What is the difference between a APC 11x5.5MRP Multi Rotor Pusher Propeller and a APC 11x5.5E Electric Propeller. I understand that one is a pusher. APC doesn't make 11x5.5EP. Is the APC11x5.5MRP really the same thing just being hyped for the Multi Rotor market?
???
Yes, they do make a 11x5.5EP.
And don't use MR props on a control line stunter! You've been warned!
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Yes, they do make a 11x5.5EP.
And don't use MR props on a control line stunter! You've been warned!
I kinda suspected that the MR line of props were not suitable for our use. Thats why I asked the question. On the subject of the APC 11x5.5EP I did not find any on the Tower web site. Who sells them?
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http://www.apcprop.com/product_p/lp11055ep.htm
MM
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http://www.apcprop.com/product_p/lp11055ep.htm
MM
Thanks!!! This gives a complete listing of all of the APC props. #^ #^ #^ #^ #^ H^^
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And if you're looking down that list, you'll encounter the 13x6.5 (F2B)
This is the old 13x6.5 I was so happily using. Then I decided I needed some back up props for this year's WCh.
I put one of those to the test, only to find my lap times had dropped from 5.3 to 5.8 %^@
After some close inspection the new props appeared different (By then I didn't know of any 'upgrades')
Two e-mails to one of the APC guys made clear they'd made some changes since the time my first prop had been produced.
But he wrote, 'If the old version works better for you, I'll start making that again'. Talking about listening to your customers....
So that's why it's in the list again.
And no worries, in spite of being labeled 'F2B', it will work for AMA CLPA just as well... ;D
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same thing with the 13x4.5EP, it went from the first version, they then adjusted it for some reason, and it took an additional 2000 rpm, so now they have the 13x4.5 EP and the 13x4.5 F2B ( which is the original)