Overspeed the head

[povern]

I was working on "McDoogals" this weekend. Had trouble getting the head to really over speed.


Any tricks to this?

[blade450]

Depends on a lot of things, including headspeed, size and so on, but here is how I do it.

Just start tail in upright. Go high. Stop at a certain point, now drop the tail, so you're coming down tail down. While you do that, go mid stick(or if it's windy, only correct for the wind so the helicoper drops in a straight line to the ground).

After letting it drop for as long as you are comfortable with, just give forward elevator to get the helicopter back upright, and negative pitch. The negative pitch will just like in an autorotation, make the blades spin. In our case, we want to go faster as our normal headspeed, so you need more negative compared to an autorotation.

How much pitch depends on much you want to overspeed it. I would not recommend 12 degrees negative on the first try, just feel it out a bit. If you don't hear the headspeed go up, you need more negative.

If it starts to sound scary, slowly go back to positive to slow it down, and stop it.
If it doesn't sound scary anymore, try to learn how much pitch you need to stop the helicopter at a certain falling speed. That way, you can learn to stop the helicopter at the height you want it to stop, and over time, you can do it lower.

It's not harder as that.
Just be really careful, try it a bit high, I'd hate to see anyone crashing.
Before you try this, make sure your machine is mechanically perfect, as the helicopter, and in particular the head will be stressed hard. When you're coming down fast, it's not the best moment to find out the blades can't take that headspeed .
Also keep in mind that everytime you stop the helicopter hard like that, the one way takes most of the initial hit, so if you do this often, you might need to replace them more often.

[gitbse]

Pretty much. Nothing more than an exaggerated auto. The disc acts like a windmill, so the more negative pitch it gets the faster they will spin. And like he said, it puts super stress on the machine, so make sure everything is nice and solid.

[7hvman]

Got

[mountaindewdude76]

That was a good explanation, buddy! I'm certainly no where near skilled enough to try an "over-speed" but it was an informative read.

[agent orange]

Just a question from an person who is still very much learning. Why would you want to intentionally want to overspeed the head. I work on the talk deal Helios and that is the last thing we want to do.

[Bob O]

You can get a more aggressive/violent stop or reversal. Plus is sounds cool.

[povern]

I dunno, I just cant get that really big overspeed, unless i do something like a powerloop.

[gitbse]

Originally Posted by Bob O

You can get a more aggressive/violent stop or reversal. Plus is sounds cool.

Yep. It sounds really cool and gives you a crazy hard hit. Amazing amounts of stress on the machine though.

[blade450]

The sound indeed, and it's a nice move to learn the effect of collective on your helicopter. Plus it's fun to scare people by letting it drop low before stopping

[gitbse]

Originally Posted by blade450

The sound indeed, and it's a nice move to learn the effect of collective on your helicopter. Plus it's fun to scare people by letting it drop low before stopping

The reactions of the guys at the field are half the fun of flying good 3d.

[blade450]

Originally Posted by gitbse

The reactions of the guys at the field are half the fun of flying good 3d.

Heheh...yes indeed

[mr. mark]

Nice explanation, thanks.

I also tried some Mcdoogle lately. After it fell, tail in, i just brought it back up and gave positive pitch. It stops the machine pretty fast and gives a nice loud bladefart. Other than that, no overspeed..
That will be my problem.

In the video's of prof pilots it looks like they stop the machine pretty quickly, so i thought they didn't give negative pitch.

[mr. mark]

take a look at this mcdoogle btw, pretty impressive

around 4:40

[povern]

Originally Posted by mr. mark

take a look at this mcdoogle btw, pretty impressive

around 4:40

Exactly what I want to do, now - how to do it.

[confusionsays]

I go fast forward, then flare back while maintaining altitude with collective until I'm at full negative pitch with the nose pointed up about 45 degrees. You can also do this while descending. I generally only do this with my MCPx because I don't really care if it blows up, plus it helps me with moving into more aggressive manoeuvres. I do it a little with my bigger helos (500 and 600) but not to insane head speeds. Remember your poor little tail rotor is geared up and will then be doing ludicrous RPM's. Kinda like overspeeding the rotor on a full size turbine helo. If you are too aggressive in a flare or an auto, either the tail will self-destruct, or the turbine blades will fail.

[Bee_random]

Originally Posted by gitbse

Yep. It sounds really cool and gives you a crazy hard hit. Amazing amounts of stress on the machine though.

I saw a set of blades part ways after a pretty extreme tail slide and over speed. Fortunately they went along the flight line. Gotta be the exception and these guys were pushing the very limits, but be sure you're kit is up to the job

I've got to believe the failure point is the screw thread into the feathering spindle.

[neverland]

I was working on "McDoogals" this weekend. Had trouble getting the head to really over speed.

what is that?

[mr. mark]

See my post with the youtube video in it

[pitounet]

For a correct over speed you really need to build up a lot of speed that you will convert into headspeed, that is why it is easier to start from a power loop.
If you want to do it from a vertical move like a tail slide, it is better to give an initial downward impulse before you start the tail slide you can also start from very very high. You need to have the balls to see the helicopter drop at a crazy speed before you put it level. Sometimes some funny effects will appear (tail wavering like if too much gyro gain).
It is not an easy move as it is not always easy to place correctly the heli and it can be very dangerous as it really stresses the spindle screws much more than they should be. Finally depending your level the overspend will be more or less impressive. Duncan Bossion makes over speeds that make the HELI sound like a motorcycle his hs goes to 4k and more on a 700. This is just crazy and scary.