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HelicopterThunder TigerOther › Initial throttle curve for TT50?
03-28-2005 06:54 AM  13 years agoPost 1
brian2kgt

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Mt. Pleasant, PA

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What is a good initial throttle curve on a brand new stock 50v2 with TT50, 15% CP, woodies, using the following pitch curves?

I have decided I am going to set my pitch curves for 3/4 stick hover at..

Normal -4,0,10
Idle Up -10,0,10

Should I just start with a basic linear throttle curve like 20,25,50,75,100 in Normal and 100,75,50,75,100 in Idle Up? Will these numbers cause overspeeding? Or are these numbers fine since I will be running rich for break in?

I'm guessing that I just need some kind of basic curve as a starting point to get the engine tuned. Then I can go back in and fine tune the throttle curve for headspeed, correct?

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03-28-2005 09:48 AM  13 years agoPost 2
Al Magaloff

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Sounds like a good place to start. I always start there myself. You may find the 50% @0* pitch is a bit much, but maybe not. Make sure the low needle is rich as it can go.

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04-08-2005 04:00 AM  13 years agoPost 3
brian2kgt

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Approximately how much throttle does the R50 require to hover at 5 degrees pitch? 75% seems a bit high to me.

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04-08-2005 10:22 AM  13 years agoPost 4
Al Magaloff

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Sounds high, but is correct. If half stick is 50% open, your ATV's are at 100%, and full stick is 100% open, then 3/4 stick position would yield what? You can always pull it back a little, but is the best place to start.

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04-24-2005 07:49 PM  13 years agoPost 5
brian2kgt

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I was just doing some reading on RaptorTechnique and now I am a little confused. He suggests that in normal mode at 5 degrees the throttle should be 40% on a R50. There is a pretty big difference between 40%-75%.

I haven't got all the parts for my Raptor yet so I'm not able to try anything yet. I'm just trying to be as prepared as possible for my first flight.

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04-24-2005 07:55 PM  13 years agoPost 6
ptarp

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I found the page you were talking about, but that sounds too low to me.

An easy way to figure it out...

Setup your pitch curves with the desired hovering pitch at center stick (usually 5.5deg)

To start out, just use the throttle curve shown on raptor technique and see if you are actually hovering at center stick. I would imagine you would be hovering somewhere above center stick, with a very low headspeed.

If it does hover above center stick, raise the throttle curve at mid (smooth out the the rest) untill it hovers at center stick (5.5deg) wich will yield a headspeed in the range of 1500rpm and is ideal for training, or simply getting used to a new heli.

In the unlikely event that you are hovering below mid stick, simply do the opposite (lower throttle curve)


Philip

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04-24-2005 08:21 PM  13 years agoPost 7
brian2kgt

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Thanks ptarp but I want to set up my hover to 3/4 stick in all modes.

I can't use the curves from Raptortechnique because he hovers at 1/2 stick.

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04-24-2005 08:23 PM  13 years agoPost 8
ptarp

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The same concept applies though. Set your desired hover pitch at 3/4 stick and adjust throttle curve to hold hover there.


Philip

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04-24-2005 08:31 PM  13 years agoPost 9
brian2kgt

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Yeah I understand that. I'm just trying to get a starting point throttle value for my 3/4 stick position(5 degrees) in normal mode. Al suggested 75% was good and Raptortechique says 40%. That is why I am confused. I guess I'll just pick a number inbetween and work from there. Thanks.

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04-24-2005 09:04 PM  13 years agoPost 10
Al Magaloff

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Brian, does RaptorTechnique explain how to solve the overheating motor problem? When correct, the carb is open "enough" at 0* pitch. You then richen the needles some, if the motor tends to overspeed. These are venturi carburetors. They depend on airflow, to flow fuel. Try it my way. I run 3/4 hover in normal and idle up. Same 1850 headspeed for both. My 30's are cranking a bit faster. I don't care for the two headspeed deal some people like to run. My helicopters don't care where the switch is, both throttle and pitch curves are the same for all modes.

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04-24-2005 09:17 PM  13 years agoPost 11
phil844

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al mags is right just do it

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04-24-2005 09:28 PM  13 years agoPost 12
ptarp

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Same 1850 headspeed for both...
This is the key in the apparent discrepancies between raptortechnique and Al's suggestion. Raptor-tech is assuming you want a headspeed of around 1500-1600, not 1850.


Philip

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04-24-2005 09:31 PM  13 years agoPost 13
Al Magaloff

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Agreed. I've always found the 1500 headspeed to be a dog on a Raptor.

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04-24-2005 09:39 PM  13 years agoPost 14
brian2kgt

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Oh OK, I understand now. Thanks guys.

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04-24-2005 11:04 PM  13 years agoPost 15
Want2BRealPilot

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Asheboro,NC

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brian2kgt, here's my settings with 50V2, TT50 with CP 15%.

Pitch: Normal -4, 0, +9 Idle up -9, 0 +9
Throttle: Normal 8,25,35,42,90 Idle up 90,44,38,44,90

These settings are for 3/4 stick hover, and yeild headspeeds of around 1700 normal, and 1950 Idle up. The throttle values sound low, but I'm running a MP2, which required me to bump the curve down, a tad.
Keep in mind that every setup is different, and what works for one may not necessarilly work for another. These numbers will give you something for "rough" comparison.
Cheers, Mike

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HelicopterThunder TigerOther › Initial throttle curve for TT50?
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