Important Event Report!!!

[Anne et Xavier]

Thanks Bob for the report. I am glad there were no injuries. What about
the plane ? Any damages due to vibration ?
Do you have any pictures ? It may worth telling MA about it.
 
The only RPM limitation I find on their website is 160000/prop diameter.
http://www.masterairscrew.com/techbull.asp
In this case 10000 RPM. 85-8600 is about 15% margin.
 
I will stop using mine. It has only about 30 flights. That's too bad. I
like that prop.
 
Xavier
 
 

-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of Bob Pastorello
Sent: September 7, 2005 7:39 PM
To: NSRCA
Subject: Important Event Report!!!


Today, while running an OS 1.60 with Master Airscrew three-blade 16 x 10
on the ground, ONE blade departed cleanly at the hub at near full power.
The blade travelled approx. 45 yards, directly in line with the prop
disc-plane of the engine.  There were no injuries.
 
This particular MA nylon prop had approximately 75 flights with the OS
1.60 on Aeroslave pipe setup.  Ground peak rpm was in the 85-8600 rpm
range.
 
Based on other reports of three blade failures on the OS 1.60, I won't
encourage their use any longer.  Two brands, several different owners,
different setups.  Common elements - OS 1.60 on pipe and three blade
setup.
 
This is just an FYI to those interested.

Bob Pastorello
www.rcaerobats.net
rcaerobob at cox.net

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