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08-28-2007, 08:18 PM
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Super Contributer
 
Join Date: Jun 2007
Location: Lake Mary, Florida
Posts: 141
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IMAC Engine shut off
I thought I read somewhere that you were required to have two means of engine shut off.
I can not find it in the rules. Does this exist or is throttle trim enough to compete. I also use a choke servo but have a friend that wants to give it a try and he only has the throttle trim. Thanks, Mark |
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08-28-2007, 10:17 PM
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#2 | ||||||||||||||||||
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Bad-ass Super Contributer!
  
Join Date: Feb 2006
Location: New Iberia, LA
Age: 37
Posts: 1,249
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Re: IMAC Engine shut off
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08-28-2007, 11:06 PM
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SILVER FOX
Join Date: Jan 2006
Location: Acworth GA
Posts: 1,182
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Re: IMAC Engine shut off
Wayne IMAC SE Judging Instructor |
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08-29-2007, 01:50 AM
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#4 |
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Bad-ass Super Contributer!
Join Date: Jan 2006
Location: Orange County CA
Posts: 233
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Re: IMAC Engine shut off
Whether its a rule or not, everyone should have a separate kill mechanism for their engines. I've personally had a throttle servo fail and have seen it with others multiple times. Without a kill switch you are gambling. You can use the choke mechanism, but the best and most effective way is with an optical kill switch like ElectroDynamics.
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08-29-2007, 03:25 AM
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#5 |
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Mother Hucker +
Join Date: Jan 2006
Location: australia
Age: 38
Posts: 2,407
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Re: IMAC Engine shut off
Over here in Australia it is a requirement to compete in IMAC that all gas engines have a separate means of killing the engine, ie. Choke servo, optical kill switch etc. I personally have had 2 throttle servos die, one was on a full power upline the other in straight level flight, both time with the aid of a kill switch I was able to get myself into a position and land. More importantly though its there for safety. Worst case scenario if a plane goes WOT on the pegs or roll out due to throttle servo failure it can be shut down instantly with out danger.
__________________
(ASAA) www.scaleaeros.com.au DESERT AIRCRAFT AUSTRALIA: NUMBER 1 FOR PRODUCT AND CUSTOMER SERVICE. |
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08-30-2007, 07:26 AM
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#6 |
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Super Contributer
Join Date: Jun 2007
Location: Lake Mary, Florida
Posts: 141
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Re: IMAC Engine shut off
Thanks for the answers guys. I will continue to use a choke servo. It is good to know the the rules though rather than going on rumor.
Mark |
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08-30-2007, 07:29 AM
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#7 |
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Flamingos are everywhere!
Join Date: Jan 2006
Location: Johns Creek, GA
Age: 44
Posts: 7,158
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Re: IMAC Engine shut off
using the choke is VERY hard on the engine and loads it with Lots of fuel...
I would use a throttle cut off before a choke..... With my 40%er, I can shut it off with the throttle and with an EDC optical cut off.....
__________________
EXTREMEFLIGHT R/C Tech support 2011 IMAC Southeast Regional Director/IMAC Sequence Committee / IMAC Judging Instructor TEAM FUTABA |
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