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HomeAircraftHelicopterBeginners Corner › Adjusting main rotor RPM
12-06-2004 03:27 PM  13 years agoPost 1
MikeO

rrNovice

Chesapeake, VA

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Good day.

I've flying my Rappy 30 for about a mouth. During that time I've thought that my rotor rpm sounded high. This past weekend I purchased a tachometer. At hover I'm at 1800 rpm.
The manual states for a beginner I should be turning 1550. My hover is set to midstick and my pitch gauge reads 6 degrees at midstick.
How can I reduce my main rotor RPM? All linkages are set to manual specs.
Thanks in advance for the help.

MikeO

Raptor 30V2
OS32
6XHS

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12-06-2004 03:30 PM  13 years agoPost 2
Jonesy

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Planet Earth

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You could drop the midpoint on your Throttle Curve and that will reduce your rotor speed.

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12-06-2004 03:32 PM  13 years agoPost 3
Hercdriver7777

rrApprentice

South Carolina

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Not to be indirect but I would suggest checking out http://www.raptortechnique.com under throttle curve/pitch curve settings. Sounds to me like you have your pitch set up for half stick hover (I would suggest 3/4 but that another thread) and your throttle curve is a bit off.

Good Flying!!

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12-06-2004 03:49 PM  13 years agoPost 4
MikeO

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Chesapeake, VA

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Thanks for the prompt responses. Raptortechnique was the first place I went to. He refers to a 5 point curve which my radio (6xhs)doesn't have.
I'll have to read the radio manual. What setting(s) would I need to adjust.

Thanks again.

Mike

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12-06-2004 04:19 PM  13 years agoPost 5
NRoof

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Palmyra, NY

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Mike,

1800 head speed is not unreasonable. I would personally leave it there. You will want the higher head speed once you get into aerobatics/3D. I am running between 1900 and 2000 for normal and idle up on my Voyager. Most people I know that fly Raptors also have around 1900 head speed.

Norm

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12-06-2004 04:24 PM  13 years agoPost 6
Jonesy

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Planet Earth

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Depending on the type of radio that you have depends on how many "points" that you can adjust. Some Radios will have 5 points and some will have only 3.

Read your Transmitter manual and figure out how to adjust your throttle curve. Hovering at half stick is fine for beginners.

I took this from your Manual on page 51. You need to figure out how to adjust these. It looks like you can only adjust the midpoint throttle position. The higher end Transmitters you can adjust 0, 25, 50, 75, and 100% points.

Futaba 6XHS

The Hovering Throttle function may be used to trim the throttle near hover without affecting pitch. This function is handy to make up for changes in rotor speed caused by variations in temperature, humidity, or other conditions. Changing the percentage in the window moves the throttle curve above or below the straight line as shown in the figure. Its value is stored in the model memory so that when the model is recalled, the original setting is repeated. This function is best used with the hovering pitch function, so that more exact trimming may be carried out.

Working with Hovering Throttle

1. Press one of the MODE SELECT buttons until the HV-T window appears. A flashing percent indicator should appear.
2. Adjust the hovering setting value by pressing the (+) or (–) DATA INPUT keys. You may select any value between -100% and +100%. You may return to the default setting of 0% by pressing both DATA INPUT keys.

Good luck

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12-06-2004 04:25 PM  13 years agoPost 7
Jonesy

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Planet Earth

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MikeO

Even if you leave your headspeed at 1800, Figure out how to adjust your transmitter for whatever you want. It will help you out in the future.

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12-06-2004 04:39 PM  13 years agoPost 8
MikeO

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Chesapeake, VA

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Thanks Jonesy

I'm far from any 3D maneuvers yet and I agree learning to adjust settings even if I dont need it is a good thing.

Looking through the manual I found the setting PI-N (Normal). Is this the 3-point curve I need to adjust? The manual is vague. How do I go about adjusting this?

Thanks again for all the replies.

Mike

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12-06-2004 04:54 PM  13 years agoPost 9
Rick_H

rrKey Veteran

Boulder City, Nevada

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If you are running TT wood blades You will want to get that head speed below 1700RPM. They are not rated for speeds above that. Running above it can lead to the loss of a blade in flight.

Rick

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12-06-2004 04:55 PM  13 years agoPost 10
Jonesy

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Planet Earth

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Pi-N = Normal Mode pitch seting
Pi-I = IdleUp Mode pitch setting
Pi-H = Hovering mode pitch setting

You are looking for something that says HV-T (Throttle) It will probably say 0%.
Adjust this to something like -10%. Then tach your rotor speed and see what the speed is.

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12-07-2004 02:50 AM  13 years agoPost 11
okw14

rrApprentice

Morgantown, WV

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6XHS
Mike,

As Jonesy posted, PI-N is for Normal mode pitch settings; high and low endpoints only. However, the PI-H is for Throttle Hold. To get to the pitch settings for Idle Up and Throttle Hold, use the curser key once you're on the PI-N menu. The first setting on this menu is for Normal mode high endpoint. Pressing the curser key once takes you to Normal low endpoint. Next is Idle Up high endpoint and so on. If your low and high are around -1 or 0 degrees on the low end and +9 or 10 high, then you should be good to go (with the mid-stick at +5 or 6).

The HV-T is where you change the throttle mid-stick point. Use the ATV's to set the throttle endpoints. 0% on HV-T is halfway between the 2 endpoints. Changing to a positive number moves the mid-stick throttle position closer to the high endpoint (increases mid-stick throttle); negative is closer to the low endpoint.

Hope this helps. I used to use a 6XAS until I bought my 9C this summer, so if you have any other questions about it, I might be able to help.

Keith

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