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HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › Hawk Pro Head Speed Questions?
02-07-2006 01:47 AM  12 years agoPost 1
Jack Skip

rrApprentice

Abaco, Bahamas

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I am sooo happy now. My Hawk Pro flies again.

The majority of my parts arrived and I had enough time to install them, just in time for the winds to stop today. I flew twice. Lunch time and this evening. About 6 tanks each.

The OS37 is settling in nice, with Toki muffler. I leaned it a bit and it screamed. I was concerned head speed may be too high, but have no way of knowing. Throttle at hover was about 60%. Lots of smoke. Back plate real cool after flights. Finger could stay there all day.

Engine humming and I like the collective feel of the higher headspeed. Much more responsive. Just not sure if it is too much.

She hovered better. No wobbles. No shakes. Seemed to like the higher head speed.

How do you know when enough is good?

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02-07-2006 01:54 AM  12 years agoPost 2
beavis1

rrKey Veteran

New York state

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Yipee
Good for you !
Glad she is back and flying for ya..

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02-07-2006 02:00 AM  12 years agoPost 3
Jack Skip

rrApprentice

Abaco, Bahamas

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Yup. Real happy now.

I also have the bigger flybar, 3D paddles and the tail upgrade.

Much more responsive on cyclic. You can also see the yellow paddles better. They make such a pretty yellow circle right under the blades. Tail seems easier to dail in.

I am happy now. Flying again. And 3 new people came up while I was flying and want to get one.

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02-07-2006 03:17 AM  12 years agoPost 4
Buzzin Brian

rrProfessor

College Station, Texas

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I will say you need to get a tach, and have a friend check it for you. That is the only way to know for sure what the head speed is. And if you are running woodies you need to know. IMPO I wouldn't run woodies much over 1700. But that is me. Still you need to know, because you don't want to blow the thing to pieces because you are running 2200 on the head and you don't know it. Believe me, it CAN happen. Get a tach would be my vote. Oh, and glad to hear you got it going again. Enjoy it.

Build it, fly it, crash it. Repeat as often as needed.

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02-07-2006 03:38 AM  12 years agoPost 5
Jack Skip

rrApprentice

Abaco, Bahamas

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Ok. Doing searches now on a tach.

Got any recommendations?

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02-07-2006 04:48 AM  12 years agoPost 6
Buzzin Brian

rrProfessor

College Station, Texas

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Yes I do. Look for the Miniature Aircraft version 2 tach. The face of it will be red. It is the way to go.

Build it, fly it, crash it. Repeat as often as needed.

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02-07-2006 09:05 PM  12 years agoPost 7
oldfart

rrProfessor

Vancouver, Canada

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Jackskip,

You may be well above 1850 in RPM, if you have a linear mechanical/radio set up on your throttle (one where 0 would be a closed barrel, 50% would be the barrel half open and 100% would be the barrel fully open).Of course I am assuming you are using a good 15% to 30% fuel and a good Enya #3 or OS#8 plug and relatively close to sea level.

Why I say this is because you mention that you are hovering at 60% throttle. An OS37 with a muffler like that from the Toki would not require a 60% throttle opening to hover 550mm blades on a light heli like the Hawk unless you are running low hover pitch at a high throttle setting.

So consider adding more pitch at hover and less throttle ... maybe 50%.

If you are just training I would try to set for a 1600/1650 or so hover rotor speed.

At this rotor speed it should not sound like it is "screaming"....more like it is "fat & happy"

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02-07-2006 10:34 PM  12 years agoPost 8
BC Don

rrElite Veteran

Calgary, AB Canada

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With my Toki, I can hover somewhere between 40% and 50% with a head speed of 1800 with woodies. That was before I got the tuned muffler. I'll need to retach to see where things are at now.

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

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02-08-2006 03:07 AM  12 years agoPost 9
Jack Skip

rrApprentice

Abaco, Bahamas

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Thank you AD Don and Aged Popsy,
I am using:

20% Morgan Fuel
550 Funky Fiber Glass blades
OS 37 engine
Toki muffler
45% on throttle curve equals half throttle on carb
60% on throttle curve at half stick = hover
100% on throttle curve equals wide open throttle
13% on throttle curve equals idle
Half stick equals 5.5 degrees pitch = hover

Lots of smoke and the engine is cool after running. I can hold my finger on the back plate for ever.

Don't know if that helps.

I need an optical tach. Any suggestions?

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02-08-2006 11:36 PM  12 years agoPost 10
Buzzin Brian

rrProfessor

College Station, Texas

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The engine temp is only going to point out if you are running it to lean. Not paticularly that the head speed is to high. No one is going to be able to tell you what it is by knowing the stats on the radio. Not trying to be rude in the least. But I have seen plenty of values in a radio that made no sense due to a set up issue with the heli geometry. That and the environment you are flying in will effect how the engine is tuned and running. So how the engine runs where I am, and how it runs where you are would likely be two different animals. The optical tach is the only way to know for sure hands down what it is you are dealing with. It is one of the best final set up tools you can own. The Miniature Aircraft tach I have found to be about the best all around unit if you ask me. Everyone I know either has one, or wants one. Heck I have 2. GREAT tool to have.

Build it, fly it, crash it. Repeat as often as needed.

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