Raptor 30V2 to Stretched E-Raptor Conversion

[dreslism]

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]

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]

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]

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 :arggg: 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. :D
It made funny noises and such also.

[dreslism]

Make sure your tail belt is not twisted.
I have actually flown one with a twist in it years ago. :D
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. :D
Strapping one down will certainly not avoid it. :D

[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 ??

[MLaBoyteaux]

I've finally got my conversion ready to fly. I spent all weekend fabricating front mount designs and then promptly scrapped them. I've got a design that'll work, have to see what happens when it's in the air.

It would've saved me about 15 hours of work if I'd have just gone ahead and bought a mount kit from DJ :arggg:

With the 2 1/4 lb Rebel XT out front, I needed to put the FlightPower 11S1P 5000 battery pack behind the skids to get it to balance. So I fabricated a battery tray that extends behind the skids to support the batteries.

I've spooled it up momentarily without the mains to check everything out. The airframe has a high frequency buzz from the motor, but the camera platform is smooth as silk.

I should get it in the air this evening!

[WillJames]

AWESOME, can't wait to see how it goes.

[Teej]

I did spool up my rotorhead/flybar, just without blades (or tailboom) attached.

I was a bit surprised at how warm the motor got with such little (no) load. Ran it up and down a few times and the motor can got rather warm to the touch. My old IR thermo said ~ 120ish.

I've got a set of vario landing gear ($60+ for struts/skids. Ouch) on the way. Going to try flipping the servo tray over tonight and trimming down a set of stock thundertiger paddles for clearance.

Which options are you using on the HV-85...especially the soft start? I left the default ("soft" as opposed to "hard" or "very soft") and still get the 'kick' before full start.

I also have it set in governor high.

I spun it up and played with the throttle ATV...it runs from -100% to +27% - from what I've seen, that sounds about average (on a 100/100 travel, that would be just short of "70%" to full throttle).

Wish I could avoid the spark when connecting the packs. I know it's coming and it still makes me jump half the time since I've seen what can happen to lipos...heh.

[miami6]

mark how about some pics ? of your set up

[fitenfyr]

With no load the motor is not performing "efficently".
You can't really tell what the motor is going to do until you put a load on it, but if it is getting to 120 then you may have a problem, but my motors all tend to run around there after a flight.
I would approach the first flights carefully.

[MLaBoyteaux]

OH MAN THIS THING IS SOOOOOO SMOOOOOOOTH!!!!!!

Put two flights on it with the FlightPower 11s1P5000 packs.

http://www.helifreak.com/album_mod/upload/fddac08bdc5e6ed7aafe7d1afd0a08d5.jpg

http://www.helifreak.com/album_mod/upload/9391766d94c4ae53e04fa8c6ae3f1564.jpg

http://www.helifreak.com/album_mod/upload/ae3d0bb625efc36b868572c6bbf2c0be.jpg


I'm running the R30 gear set in governor mode. The headspeed at 95% is 1650. AUW is 13lbs 4 ounces with 2lbs 4 oz of ballast on the mount to simulate the camera. In hover it's pulling 20 ~ 21 amps.

[dreslism]

Glad to hear it. I like your picture title!

[AZ ChopperCam]

ohhh dear! that's one hell of a Redneck kit! ( I can say that... I'm 100% Alabama Redneck)

you need a RaptorCam mount! PM me when you're ready and I'll work out a deal for you.

what motor did you end up with? 16s?

[MLaBoyteaux]

Crap. I can't get the picture thumbnail to work. WTF? siteimg doesn't work?

Dangit, phone always rings when I'm in the middle of a post. :arggg:

Yeah the 16S. After hovering for a few minutes, the motor was 145, ESC was 115 and batteries were 95, ambient was 85

http://www.helifreak.com/album_mod/upload/04dfe934994a2c7349cdbb26c674dba0.jpg

I tweaked the tracking and it looks spot on. I've got the governor set up for very soft spool up and DJ's tip on giving the blades a little spin by hand really helps. I've got the normal mode set to 0-95-95-95-100. When spooling up, the head does a funny wobble like I've never seen before. I put the normal blue head dampners in, and when it's spooling up, the whole head and flybar will do a big circular wobble when it's about half way spooled up. Funky. Once it spools through this momentary wobble, it smooths out and comes up to speed.

I may try the soft start to see if it will spool up through this zone a little faster.

[MLaBoyteaux]

You think this looks Redneck, you should see the ones that I DIDN'T use!

Like I said, would've saved me a whole Saturday and half a Sunday if I would've just bought a whole mount kit from you. :arggg:

I checked the balance on those blades I got from you with the Koll Rotor pro, they were spot on :D
They really sound good in a forward descent.

Both my Rebel XT and my HC1 with wide angle adapter weigh 2 lbs 4 oz so it'll make it easy to swap between them. I had to put the main batteries behind the skids though to get it to balance. The battery tray looks Redneck too. After putting lightning holes in it, it weighs 2.5 ounces, but I didn't weigh the aluminum rails that are supporting it. They're probably several ounces. Maybe if I made a new bottom frame out of carbon fiber I could shave a couple of ounces.