What % nitro to use? Part 2-stepping down with a rev limiter. - RCCanada - Canada Radio Controlled Hobby Forum
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Old 08-08-2010, 10:24 AM   #1
zvman
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What % nitro to use? Part 2-stepping down with a rev limiter.


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Thanks for all info in first question.

Second question. My heli has a rev limiter in the receiver, AR7100R , and it has been set up with engine being on 30%. If I step down to 15% or 20%fuel, will this cause a problem for my rev limiter setup and headspeed? Will it require a new set up? Thanks.
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Old 08-08-2010, 11:07 AM   #2
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Re: What % nitro to use? Part 2-stepping down with a rev limiter.

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Originally Posted by zvman View Post
Thanks for all info in first question.

Second question. My heli has a rev limiter in the receiver, AR7100R , and it has been set up with engine being on 30%. If I step down to 15% or 20%fuel, will this cause a problem for my rev limiter setup and headspeed? Will it require a new set up? Thanks.
All a rev limiter does is - limit the top head speed by controlling the engine' rpm.

Your pitch/throttle curves might need a wee bit of tweaking though, if they were set up on 30% fuel, to allow for the slight reduction in power throughout the engine's rpm.

Basically I would think a little more throttle from around hover point to max (increase the throttle a little bit along the curve from just below hover to high) and you might have to take out a wee bit of top end pitch.

The rev limiter is a moot point, it will still limit the head from overspeeding at whatever rpm you set it at.

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Old 08-08-2010, 12:29 PM   #3
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Re: What % nitro to use? Part 2-stepping down with a rev limiter.

The first step would be to first be sure to set-up your needles so the engine runs properly on the different fuel (going down on the % f nitro means they will have to be set a bit leaner).

Once you have the engine running smoothly, then reset your throtle curves as AJ recommends, (with a limiter be sure to set for a rotor speed that may be a bit higher then you wouls set your limiter for) and to set some swash to throttle mixing to insure rotor speed is kept through maneuvers..
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Old 08-09-2010, 05:29 PM   #4
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Re: What % nitro to use? Part 2-stepping down with a rev limiter.

Thanks again.
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