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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › OS 91 HZ mid needle setting?
02-24-2010 04:41 AM  10 years ago
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natew

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Brattleboro,VT USA

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OS 91 HZ mid needle setting?
Hey guys,

Is there any really good way to tell if you have your mid range needle set just right?

Thanks
Nate-
Trex 700, Trex 500, Trex 450 Pro
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02-24-2010 02:10 PM  10 years ago
Git

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Brunei

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read ben minor's aka dr ben's engine tuning guide. it's here somewhere on RR.

or go to bert's website and watch the video.
Alees Rush 750
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02-24-2010 02:50 PM  10 years ago
koppter

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Virginia

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start at the factory defaults in normal mode with a linear curve. get the high close to where you want it. as you throttle up you should notice a gurgle through the mid range from being rich. lean the mid 2 - 3 clicks until the transition is smooth. won't take more than a couple of times.

done...
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02-24-2010 02:54 PM  10 years ago
natew

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Brattleboro,VT USA

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Thanks Git,
Don't you have to subscribe to the smack talk vids? I tried looking for a tuning guide but all I see is for the 50's. I've had the 700 with the HZ for about a year now and its been running great I have just never touched the mid range needle. Right now its 2 turns out and while its definetly not causing any issues I just wanted to start to really fine tune it for max performance. Everything I do see about it is saying now with the high speed tuned re check hovering and tune the mid to achieve best results....so what's the trick? Yeah it hovers fine but where's the sweet spot?
Trex 700, Trex 500, Trex 450 Pro
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02-24-2010 03:00 PM  10 years ago
natew

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Brattleboro,VT USA

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Is there any risk of leaning the mid too much? or does the high speed needle really dominate the mixture overall?Trex 700, Trex 500, Trex 450 Pro
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02-24-2010 03:07 PM  10 years ago
Git

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Brunei

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easiest way is to hover and lean the mid until the hovering sounds rough den open a few clicks.

den do the full climb out test in idle up and give full negative pitch once u are at the top of your climb.. hear the engine on its way down.. if it hangs, open a few clicks more.

this method is by no means perfect but it works for me.
Alees Rush 750
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02-24-2010 04:47 PM  10 years ago
jsenicka

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Eagle River, WI

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Ben has a great write up.
Bottom line is you MUST tune high end first, then tune hover as needed to slightly richen or lean mid range in hover.
As stated here, start at factory recommendation and go from there.
The OS manual actually has a pretty good way of doing it
Jim Senicka
Team Manager, GrandRC Flight Team
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02-25-2010 03:20 AM  10 years ago
natew

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Brattleboro,VT USA

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Hey Guys thanks for the advise I will try what Git has recommended, if it ever stops snowing....I'm hoping that i'll be able to tell the difference on the way down from overspeeding and slightly hanging rpm's maybe easier than I think? I'll give it a go!
Nate-
Trex 700, Trex 500, Trex 450 Pro
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02-25-2010 03:39 AM  10 years ago
puma1824

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Maryland, USA

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IMHO Smacktalk #1 will really help you out and answer your questions. It's definitely worth the $2.99. Hell it's cheaper than a glow plug Being able to see and HEAR what a well tuned motor which you can refer back to is invaluable. Actually they even tune the motor rich and lean for reference. There's no subscription, you just have to pay for the issue you want.
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02-25-2010 06:31 PM  10 years ago
Git

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Brunei

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no prob.

+1 you must tune ur hi needle 1st..

don't allow the mid needle to dominate ur tuning.. ben wrote about this i tink in his guide.
Alees Rush 750
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02-27-2010 01:07 AM  10 years ago
natew

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Brattleboro,VT USA

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Well no doubt about it I know to tune the high needle first, was looking for some good advice on fine tuning the mid and its hard to really get it threw even good advice, so I did watch the video Bert put up on SmackTalk and I'm glad I did! Being able to hear the engine and see exactly what people are talking about is sweet! I know what to look for now and am really psyched about these vids now! Great advice Thank You!!

Nate-
Trex 700, Trex 500, Trex 450 Pro
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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › OS 91 HZ mid needle setting?
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