Throttle Curves

[BorderLine]

Just wondering does it make it any easier to run a throttle curve when Hovering and Rolling Harriers.

If Yes..Can someone Please explain how to set up Radio (JR) and what to look for in engine RPM's and responce.

If No..Please explain..

[krayzc]

yes, this makes the throttle very lineer and not the usually off and on type of deal a gas can present.....

before doing it this way t-rolls were climbing to much with throttle corrections (for me) I find this makes the landings and take off smoother also......

[Mithrandir]

Using the correct prop can make a throttle response "Feel" difference.

[bob_nj]

For me it makes everything easier, and I use a curve all of the time on my planes.
Before that though, I connect my throttle linkage to the innermost hole on the servo, and as
far out on the engine connection as I can. Then I run the ATV up as high as it will go, 150% on JR.
This gives the best resolution and is a start to getting good response.

I can't fly the way I want to with a stock curve. One click of throttle usually makes the plane climb or fall out of a hover unless I set the curve.

The JR curve allows 5 points of input. That gets too complicated as far as adjustment goes, so I
usually end up using just one point. I use the first half of the throttle stick movement to get the
engine rpm where I want if for harriers and hovering. After half throttle the response is a bit quicker
in case I need to bail. Rolling harriers are easier with a little more repsonse after half throttle too.
I like to keep the nose up in a roller, and having that type of response after half throttle works for me.

Give it a try on your 10x and let me know if I can help any further.
To see your changes on the bench, it also helps to set up a servo on any type of protractor or sevo
degree wheel. This lets you see where your servo is giving you fine and course throw responses.

One of the devices is advertised here and works great.

Give it a try

Take care
Bob

[bubbagates]

I always do throttle curves on all gas engines. Most gas engines will be making full power long before the throttle is physically fully open.

What I do is take a tach reading at full power, take at tach reading at normal idle and subtract idle from full power, that is the engines power range. Let's say as an example you have an engine turning 7000 at full power and 1500 at idle, that's a 5500 difference. Now divide that by two and you get 2750

this is loads easier with 2 people

On the 10X get the engine started and go into the curve mix. go to full throttle and bring the far end point down until you hear the engine start to drop in rpm, now bring the point back up so that you get back to full rpm and increase the end point a couple points past the full rpm setting.

Now bring the stick back to half throttle and get that point set to where the tach is showing half of what the range was, in the example it is at 2750. Now you have a basic 3 point curve. You can set 2 more points and for hovering. I like to see where I spend a lot of time with the stick during a hover ot TR. I then take the other 2 points in the curve and make a nice little flat spot in that range. That way I can make large stick movements and only get minimal engine response.

I know it sounds like a lot of work but with 2 people it should take less than five minutes and you will have a very linear curve

[emessys]

	Quote: Originally Posted by bubbagates
	I.. Now bring the stick back to half throttle and get that point set to where the tach is showing half of what the range was, in the example it is at 2750. .

I think you meant to say 2750 PLUS 1500 (4250), or am I mistaken?

[Dr. Yankem]

	Quote: Originally Posted by emessys
	I think you meant to say 2750 PLUS 1500 (4250), or am I mistaken?

Actually I think he meant 3500. If high is 5500 and low is 1500 then there is a 4000 rpm swing from low to high. Mid range of 3500 would be right in the middle for the throttle stick.

[emessys]

	Quote: Originally Posted by Dr. Yankem
	Actually I think he meant 3500. If high is 5500 and low is 1500 then there is a 4000 rpm swing from low to high. Mid range of 3500 would be right in the middle for the throttle stick.

No, Dr. Yankem. He clearly said a high of 7000RPM, not 5500.

You have been in the Florida sun way too long. Time to come home!

Ira

[Dr. Yankem]

Ira...of course you are correct. I didn't see the 7000 number; just saw the 5500 figure and since that's closer to the high end that we're accustomed to getting (usually around 5800) I used that as the top end number.
Leaving Florida Tues AM. See you at Black Dirt next weekend?

[emessys]

	Quote: Originally Posted by Dr. Yankem
	Ira...of course you are correct. I didn't see the 7000 number; just saw the 5500 figure and since that's closer to the high end that we're accustomed to getting (usually around 5800) I used that as the top end number. Leaving Florida Tues AM. See you at Black Dirt next weekend?

No. We got invited to a Seder on Saturday Night.

Maybe the week after .. I've got the new QQ YAK to test fly and I'd rather do it at BD than at PARCS.

Weather is still pretty crappy, but I got in a few flights on Barbara's Avistar yesterday , between rain showers , so at least my season is officially begun (and I havent forgotten how to fly completely . Last time was last October )

Its supposed to get nicer this week, so Im hoping to get a few flights on the Laser Wednesday or Thursday.

See you soon I hope.

Ira

A Smiley Face for every emotion except extreme boredom!

[BorderLine]

Guys..Thanks for all the great help and info. I find myself climbing out in a hover or gaining to much foward speed when doing Harrier Rolls, when I'm working the throttle.
Hopefully by flattening out a spot on my throttle I can improve my flying.

Keep the info coming.

Thanks

[krayzc]

it will !