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HelicopterGasser Model RC HelicoptersOther › Head Speeds
09-02-2009 04:21 AM  8 years agoPost 21
rbort

rrProfessor

Franklin, MA - USA

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Its a good discussion

The land at full collective thing, here is where it comes from:

If you land at less than full collective, you still have energy in the head and furthermore the blades are not flying as high as they possibly can.

If someday you have a "rough" landing at less than full collective, one were you hit a little hard and bounce so to speak, what can happen is the blades will flex down from the bump and if you're unlucky and the blade happens to be in the right place it will catch the boom and you'll get the instant boom strike. Doesn't always happen as sometimes you hit when the blade just passes the boom in this case the blade will bend down and back up before it gets to the boom. So its not always obvious.

But if you land at full collective even if you bounce the blades are flying higher and the chances of a boom strike are lower. Spool up your heli and look at the blades at 0 pitch and then at +4 degrees say before liftoff. You will see when you add pitch the blades rise up, and when you lower it they will drop down.

This is like telling you to slow down when you turn on a wet road. If there are leaves on the road in the fall you could skid and wipe out. If there isn't you probably won't, but its the same idea.

Land at full collective gives better chance of success given a bounce than not. I can land all day at part collective too and pick it up and put it back down, but I choose to fly it out until its stalls in or in other words I touch down at the same moment my stick touches the stop on the top of the TX.

As far as 0 pitch, that is the minimum collective you can use to auto down, which would produce the slowest auto possible, and you're right you will lose headspeed all the way down but you'll get something like a 30 to 60 second auto depending on how high you start, maybe even more if you can see it higher than that. I did a 52 second auto last week after a 15 second climbout at full collective here at the field doing just this. At the end of the auto, the blades are pretty well scattered and you drop in faster and faster and you just punch full collective and bounce in so to speak. This is for experts only (the bounce in landing) as I was trying to stay aloft as long as possible to get a longer time (52 seconds). Of course you can drop pitch from 0 to -4 say at 150 feet regain some head speed and do a greaser landing if you want.

-=>Raja.

MA 1005 Hanson 280, 4142 flts
Spectra 27 3DMax, 3210 flts
Whiplash V1 Hanson 300, 1440 flts
Whiplash V2 Hanson 300, 207 flts

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09-02-2009 04:31 AM  8 years agoPost 22
xcellgasman101

rrElite Veteran

WOODWARD, OKLA....

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Oh, I see your point Raja,, and I agree,, but I thought this was all about teaching a newbe how to auto,, just about everything you are talking about is for us (Experts) I love doing auto's it's the first thing I teach a newbe to do after they get good at flying around, I can't count the times I saved a heli, by just being able to do a auto,, There the coolest thing to do, I to have done the slow auto, but I like the falling out of the sky at mach speed, then stop the heli, and land,, it gets them every time, XGM/VGM

John Crotts
www.soonerhelicamproductions.com

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09-02-2009 04:40 AM  8 years agoPost 23
rbort

rrProfessor

Franklin, MA - USA

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Yes absolutely!

but I like the falling out of the sky at mach speed, then stop the heli, and land,, it gets them every time
That is the favorite one to watch amongst the Brazilians here at my field! They ask for it when they are there One guy got a radar gun one day and I can tell you that at stick to the floor -11 degrees the 1005 comes in at 62 to 63mph every time.

Good talking John and have a good night!

-=>Raja.

MA 1005 Hanson 280, 4142 flts
Spectra 27 3DMax, 3210 flts
Whiplash V1 Hanson 300, 1440 flts
Whiplash V2 Hanson 300, 207 flts

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09-02-2009 04:44 AM  8 years agoPost 24
xcellgasman101

rrElite Veteran

WOODWARD, OKLA....

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You too Raja,, Good night,, XGM/VGM

John Crotts
www.soonerhelicamproductions.com

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09-02-2009 05:52 PM  8 years agoPost 25
AceBird

rrElite Veteran

Utica, NY USA

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But if you land at full collective even if you bounce the blades are flying higher and the chances of a boom strike are lower.
Sorry, weak science Raja …

If you land at full collective you head is spinning at its lowest headspeed to sustain flight. That is what will cause a boom strike on a hard landing. If the blades are at their highest headspeed centrifugal force will keep the blades from flexing down and hitting the boom.

I would have to say that every newbie is an expert with hard landings. I have driven the recoil up into the engine without sustaining a boom strike. Newbies keep your headspeed up until you become an expert and then you can live on the edge like Raja.

Ace
What could be more fun?

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