[NSRCA-discussion] Great Planes spinner

[Jon Lowe]

Does this even apply to you guys in FAI?  I read the FAI safety code, 
here, http://www.fai.org/aeromodelling/documents/safety_rules, and 
rounded spinners or prop nuts are under the "recommended", not required 
section.  AMA requires 3mm radius of point, whatever that means.  
Looking at the 3.25 spinner on the Tower website, it probably meets the 
AMA rule, at least the intent.

For some reason, back in ancient AMA history, getting hit by a 
protruding prop shaft was viewed as a bad thing.  Why that is worse 
than a spinning prop, I don't know.  There were also sharp, needle nose 
spinners available, which were pretty dangerous.

Jon Lowe


-----Original Message-----
From: Michael Wickizer <mwickizer at msn.com>
To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>
Sent: Wed, 3 Jun 2009 10:58 am
Subject: [NSRCA-discussion] Great Planes spinner













I've looked at these before and in fact have used them on electric 
setups and have seen others use them on glow setups.

 

My question / concern was that the nose was too pointed and didn't meet 
the minimum radius required.  It is very possible I don't really 
understand the rule or how to measure it.

 

Any thoughts?
=








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