Raptor 30V2 to Stretched E-Raptor Conversion

[dreslism]

I just put the 600's back on for a second time, and it seems to spool up fine with no nasty shake at the end.

One thing I did notice when removing the 660's is that they are *VERY* tight in the grips. I don't even have to tighten the blade bolt to keep it from flopping around in the grips it is so tight.

I'll try DJ's suggestion now on grass.

ONly reason I held it down as it was hopping all over the place if I did not.

I'll try the tighter grips, on grass and pre-spin.

[dreslism]

Ok, tighter grips, pre-spun the blades, no kick from esc, did it on grass.

Same thing looks exactly like the second video at the end.

[AZ ChopperCam]

ok. I am stumped. have you tried to pick it up into a hover?

[johndale]

Watch the blade spread just before the vibration starts. Looks to me you have the WOOF

[dreslism]

Originally Posted by N74DV

ok. I am stumped. have you tried to pick it up into a hover?

Too big to do in my yard. Going to run over to a field right now.

I sat this thing on my underslung mount yesterday and it was even worse, I thought the mount was going to explode.

[dreslism]

Originally Posted by johndale

Watch the blade spread just before the vibration starts. Looks to me you have the WOOF

Not familiar with that.

What is the WOOF?

Thanks,

Scott

[Nate Dogg]

check to see if your thrust bearings are not installed backwards, and check that they are properly greased. Check your dampners too...

[fitenfyr]

That all looked like ground resonance to me.

Try it without the blocks holding it down.

Even my Ion would resonate a bit on the mount until you put a load on the head.
Anything negative pitch during spool up or down would cause a vibration.

That is why you see the resonance go away and then come back it was a change in pitch I bet from either a gust of wind or the collective.

[dreslism]

Originally Posted by Nate Dogg

check to see if your thrust bearings are not installed backwards, and check that they are properly greased. Check your dampners too...

The thrust bearings, and main grip bearings are already installed in the metal grips that I bought. Being a metal grip, I can't get the bearings out to check the thrust bearings.

[dreslism]

Originally Posted by fitenfyr

That all looked like ground resonance to me.

Try it without the blocks holding it down.

Already did.

"Ok, tighter grips, pre-spun the blades, no kick from esc, did it on grass. "

Even my Ion would resonate a bit on the mount until you put a load on the head.
Anything negative pitch during spool up or down would cause a vibration.

That is why you see the resonance go away and then come back it was a change in pitch I bet from either a gust of wind or the collective.

It's at dead zero, but it is quite windy out today.

[dreslism]

I saw some talk about raptor woofing, and it mentioned flipping the blade grips to have leading edge control, and that fixes it every time.

Anyone ever do this?

Thanks

[AZ ChopperCam]

I did that to a Raptor V1 I had years ago and it did help. I still think you should put the head under load and try a hover.

[fitenfyr]

The woofing issues usually were found after unloading the head in flight.

What where your results with it flying?
Did you get the same vibrations?

Have you checked the balance on all the blades in question?

[dreslism]

Originally Posted by fitenfyr

The woofing issues usually were found after unloading the head in flight.

What where your results with it flying?
Did you get the same vibrations?

Have you checked the balance on all the blades in question?

I took it for a flight this evening.

Spool up vibes are the same still, but once I put it in the air, it *seemed* OK.

The tail keeps screeching and kicking about 4-5 inches every 5 seconds or so which is a new thing, so I did not do much more than hover 10 feet up. If I did not know better, it almost seems like it is skipping every so often. I'll have to check the gyro setting with the new blades on, but did not have time to play with that while out. Gyro just might need a little more sensitivity with the new blades on.

Yeah, I checked the blades twice. They are dead nuts, and actually came that way. I was amazed that CG was dead on, and balance was dead on.

I pulled a blade and put a hex in that blade grip bolt and spun it and watched the other blade, and it never moved, so feathering shaft seems to be fine.

I don't think I could strap the mount on the bottom as is right now as it would just vibrate like crazy even more on spool up and maybe tip over.

This ship used to be real smooth. I put a kasama head on last week in anticipation of the stretching for the new longer blades.

Flew it after the kasama head with 600's and it seemed fine.

Stretched it Friday with new boom and belt, put the new blades on and you see where I am at. I did not expect anything like this, especially since the blades were balanced perfectly out of the box.

Oh well, off to do some more as this is my only camera ship right now.

[fitenfyr]

Make sure your tail belt is not twisted.
I have actually flown one with a twist in it years ago.
It made funny noises and such also.

[dreslism]

Originally Posted by fitenfyr

Make sure your tail belt is not twisted.
I have actually flown one with a twist in it years ago.
It made funny noises and such also.

Yeah I was just gonna pull it and check it.

You mean like like 270 instead of just a 90 right?

[fitenfyr]

Yep...or twisted the wrong way and you have the tail going "backwards".

[AZ ChopperCam]

good thing to check but a tail going the wrong way will not cause a resonance issue.

[fitenfyr]

Checking the belt and tail is in relation to the "screeching" noise.

If the resonance is still the same during spool up then I would start looking at every rotating part till you find the one out of balance.
Double check the motor mount also.
If it has slipped at all and is not supported correctly you could be starting a vibration there.
If it didn't do it with the stock head put that back on and check to see if it goes away.

One of the first things you learn when flying full scale helis is about ground resonance and how to avoid it at all cost's.
Strapping one down will certainly not avoid it.

[AZ ChopperCam]

One of the first things you learn when flying full scale helis is about ground resonance and how to avoid it at all cost's.

yep... that's why I want to hear what happens when he pulls it into a hover. Its what you do in full scale helis when resonance sets in and may apply here ??