Gary
I recently bought a Canon A610 camera. One of the features on this and some of the other Canon models is the capability to take one minute movies at a frame rate of 60 frames per second. The camera will play back the movie at extremely slow speed or even one frame at a time. I've found that this frame rate is fast enough to examine props while they are running. I've only tried it on an A6 prop so far. Even with the high RPM's that the A6 prop runs at it is possible to see and measure the flare.
I think the most reliable way to get flare on any prop is with the spar. For typical indoor props like EZB and LPP where the blades are cambered and have helical twist it doesn't seem likely that the blade itself is going to change shape very much under load.
A6 blades could be made very flexible by a series of radial cuts on the front face of the blades. I don't know if real A6 fliers would consider this to be legal.
Bill Gowen
Decatur, GA USA
----- Original Message -----
From: Warthodson_at_aol.com
To: Indoor_Construction_at_yahoogroups.com
Sent: Wednesday, April 12, 2006 9:11 AM
Subject: Re: [Indoor_Construction] A6 Propellers
Blade shape does not seem to make much difference on A6's. It is also
difficult to make an A6 prop flare, but not impossible, because of the minimum
dimensions of the wood.
A related question. I have wondered how to determine when a prop is flaring.
Presumably, it is only flaring during the initial power burst, so average prop
RPM for an entire flight might not prove anything since the RPM will vary
some from flight to flight even if the prop does not flare.
Gary
In a message dated 4/11/2006 11:35:54 PM Central Daylight Time,
izgo_at_yahoo.com writes:
Reading rules:
"Propeller 6-inch maximum diameter. Blades to be flat 1/32"
minimum sheet wood, no forming (no twist or camber)."
So, does any tested shapes, flare and other experiments
with this kind of propellers?
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Received on Wed Apr 12 2006 - 07:57:44 CEST
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:44 CET