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HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › Engine hover adjustment
10-16-2005 11:54 PM  13 years agoPost 1
605

rrNovice

Panama City, FL

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OK,

I recently got my hawk up and running after several months of idling.
My problem is that I'm hovering just above midstick about a foot or two above the ground which fine,but when i move the throttle i click up th e heli raises and continues to raise until i click it down one, and then starts to fall rather quickly. I use to hover a couple inches at midstick and as i gave it more throttle,then a couple feet and about 10 to 15 feet and then higher. But now its a foot or two and then the sky. Where do I make my adjustment.

Sport Hawk
JR 662
30% fuel
Pitch 0-5-9
THrottle L 0- M 30- H100

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10-16-2005 11:58 PM  13 years agoPost 2
airdodger

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Johnston USA

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Mid is low, bring it up to at least 50 if it is a .32 might have to go a bit higher. Chris

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10-17-2005 12:02 AM  13 years agoPost 3
605

rrNovice

Panama City, FL

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I tried that, but then I start to hover below midstick

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10-17-2005 12:15 AM  13 years agoPost 4
airdodger

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Johnston USA

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Then your pitch is off or you are way lean. What engine? Chris

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10-17-2005 12:21 AM  13 years agoPost 5
605

rrNovice

Panama City, FL

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OS32

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10-17-2005 12:26 AM  13 years agoPost 6
airdodger

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Johnston USA

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The engine will start to overheat with that much pitch on only 30% throttle. Is your throttle closed at o% and full open at 100%, and half open at 50%? Chris

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10-17-2005 12:31 AM  13 years agoPost 7
605

rrNovice

Panama City, FL

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THe engine does got hot, and is close at 0, mid 50 full 100.

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10-17-2005 12:37 AM  13 years agoPost 8
airdodger

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Johnston USA

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What is the recommended pitch for hover on the hawk? Chris

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10-17-2005 12:39 AM  13 years agoPost 9
605

rrNovice

Panama City, FL

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+5 mid stick

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10-17-2005 12:45 AM  13 years agoPost 10
airdodger

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Johnston USA

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Try what I said then. Chris

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10-17-2005 12:49 AM  13 years agoPost 11
605

rrNovice

Panama City, FL

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OK, should I adjust the mixture control or needle valve?

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10-17-2005 12:58 AM  13 years agoPost 12
airdodger

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Johnston USA

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Low should be as rich as you can have with a reliable idle, adjust needle for smooth constant drone in hover, and check backplate often until you know what it sounds right when correct. Use a quality plug, OS8 or Enya #3. Move your mid point on the throttle curve to around 55% that should put you close. Chris

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10-17-2005 01:00 AM  13 years agoPost 13
605

rrNovice

Panama City, FL

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thanks,

I'll try it tomorrow..

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10-17-2005 02:47 AM  13 years agoPost 14
BC Don

rrElite Veteran

Calgary, AB Canada

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605, sounds like you are using a Plank Radio with a "detent" on the throttle. Heli Radios have a smooth throttle with no ratchet so there is no "click" up or down. If you have a Futaba radio, you can take the back off and put the little spring in a vice and remove the bump which will make it ratchetless. That's step one. I noted you have a JR Radio, not sure if you can make the same mod.

Step two would be to move to hovering at 3/4 throttle. The reason you'll want to do this is that when you switch to any kind of 3D stuff, it'll be a WHOLE bunch easier if you learned this way at the start. Note that some folks don't agree with this and I questioned it at the start but am now convinced. With this, you'll set up your pitch curve for "N"ormal at -3, -1.5, 0. +5, +9 and your throttle curve would be around 10, 30, 50, 75, 100. Give or take. That means your engine will be at 75% with a pitch curve of 5% which should put you in a hover around 1800 RPM with 550 woodies and an OS 32 (at least those are the numbers for mine).

Looks like you are hovering at too low a head speed (30% throttle?). I need 70% plus to hover at with a pitch around 5% to 6%.

Now, you should be able to hover at 3/4 throttle and pull positive when you advance the throttle. Do this a few times and land and feel the backplate. You should be able to hold your finger on it without a problem (should be warm but now "owey" hot). And, you should be able to easily transition from idle to power without any hesitation.

Got Money? Send it to me, I'm a Heli Addict.

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10-17-2005 02:48 AM  13 years agoPost 15
SteveH

rrProfessor

Texas

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605,

When you say you move the throttle stick one click up, are you talking about the transmitter stick? If I read your post and understood it correctly, you are talking about the transmitter stick and if you have "clicks" on your transmitter throttle stick, you are using an airplane type transmitter. If this is true, you need to modify the spring detent on the inside of your transmitter gimbal.

The government cannot give you anything without first taking it from someone else.

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10-17-2005 05:13 PM  13 years agoPost 16
jackheli

rrProfessor

Vancouver - Canada

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Even if the transmitter has a ratcheted throttle stick the heli should not be that sensitive around hover. I would check the mechanical setup to make sure there is no differential on collective pitch.

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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