Raptor Clutch Problem... I think ?

[JaseGill]

Hi Guys,

Wondering if anyone else has experienced this.

I hover my Raptor and all is fine, I then set it down and lower the throttle. For a while it seems that the head speed keeps the engine speed up. I dont know where this is coming from.

It used to be the fact that you dropped the throttle and the engine revs dropped right away too and the head free wheeled, it doesnt seem to be doing that now. Could it be the clutch is binding and holding the speed high or is ot maybe the Auto hub not disengaging ?

Anyone who has experienced the same and knows a fix would be extremely helpful,

Cheers,

Jase.

[Colin Bell]

Hi Jase,

The low end mixture may be too lean causing the engine to hang up and not drop to idle right away. Does the clutch grab (head try and turn bad) in your hands after you start it? If so it's the clutch, if not then you have another problem such as the mixture.

Colin

[Jeff H]

The low end mixture may be too lean causing the engine to hang up and not drop to idle right away

I think Colin hit the nail on the head.

[JaseGill]

Guys,

It was a mix of two things.

Firstly yes the mixture was all wrong and after having reset it to the factory settings and a little twaeking it was fine there.

Also I have been playing with the throttle curve for a few days and when I went back into the settings I noticed that the P1 (1/4 throttle) on my RB8000 was way too high. Im new to this and was trying to get the middle stick throttle position to not be too jump so had mistakenly set P1, P2 and P3 within 10% of each other, as a result at 1/4 throttle the engine throttle was way too close to hover setting and was holding the throttle high. This along with my crappy tune of the engine in the field the other day was the problem.

Of course I didnt find this out till I had the engine and Auto Hub out :(

[Jeff H]

Just remember that if you're flying in normal mode, you always want your 25% point to be high. If you're hovering at half stick, you'll be decending at 1/4 stick, you want to make sure that you're engine doesn't slow down when you are decending, or you might not come up to power quick enough when you get close to the ground.

Settings similar to 0, (35-40), 50, 75, 100 should work reasonablly well. You don't want the rotor speed to increase on decent, but you sure as heck don't want it slowing down.

[JaseGill]

Jeff,

Funnily enough that about where my figures are on my Throttle Curve now. I was thinking of enabling the Throttle Jockey I had come with the helicopter (I got it on ebay part built and took it apart and rebiult it from scratch as per RaptorTechnique so that I knew it as well as I need to).

Would you recommend the Throttle Jockey ? I have seen people say its good at it job but can mask a badly tuned engine. As far as the engine goes now Im on factory settings and getting a good level of smoke and performance.

Im also concerned about reading about trying to maintain a constant head speed. It seems the trade off is that to keep the head speed constant under various pitch loads I need to play with the pitch settings to maintain a load that maintains a head speed if that makes sense ? I have a Tacho and it seems that at a rotor speed of about 1650 RPM I only just have the power to get it light on the skids at 6% pitch. Is this right ? Obviously as I then get into a hover the speed increases (or at least the noise does) and the pitch is also increasing. Should I at this point have constant speed with only the pitch Increasing? It seems that this is waht the throttle jockey would do if it were enabled as above 25% throttle the speed would be set to the given speed set in setup...

Im a little confused... Im not sure whether I should be managing head speed as close as it seems to be indicated on various websites or Im just getting a little paranoid and worrying about nothing. Any help would be greatly appreciated,

Cheers,

Jase.