rrTV-PHOTO   New HD TV
HOME   rrTV-PHOTO   GALLERIES   MY GALLERY   HELP-FAQ
myHOME PM pmRR MEMBERS 579 ONLINE 42 EVENTS SEARCH REGISTER  START HERE
 
1 page544 viewsPOST REPLY
A Main Hobbies . Boca Bearings . Modefo's RC Helicopters

.
.
Gasser Model RC Helicopters > P-Gasser NX clutch question
 
 
jschenck
Elite Veteran
Location: La Vista, NE.

I hate to cross post but there seems to be a lot more P-Gasser support traffic here.

http://runryder.com/helicopter/t409398p1/

"I am FINALLY at the point where I can start building my Predator Gas SE NX. I worked on mounting the fan tonight and thanks to James "AGRAV8"'s build thread I got the fan to less than .002 by lapping in the fan a bit then tapping it a little before snugging it down. I didn't use the bolt's he suggests because of the ESS plates don't allow for them.

Anyhow feeling pretty good about the fan I went to mount the clutch. The instructions call for M4x6 bolts to hold the clutch in place which I found in the bag with the starter shaft hardware. Well these bolts may have fit just fine with the original style fan hub but there is only about one thread worth of bolt sticking through to engage the clutch. Good news is, at least without tightening down the bolts my clutch runout is zero. Hope it stays that way!

Does anyone know what the proper bolts are for the clutch?"

...yep...
02-18-2008 03:28 PM
 
 
copperclad
Elite Veteran
Location: ..

hi jschenck

i saw this post this morning and thought i would let someone with more Predator savey jump in , but since nobody has , here goes

i just bought a Century fan and hub , and it came with a neat little packet of screws to mount the fan on the hub ( i know you are asking about the clutch screws , please bare with me ) , so the packet has four @ 4MM X 3MM round headed screws , of course the holes in the fan , were counter sunk for flat heads , and the 4mm screws were about 2mm short of reaching , and the round headed screws only bare on thier edge in the counter sunk hole so the heads contact area is only about 10 percent of what it should be

so i was in the same spot as you , should i use the screws the company included with the part , or should i go out and buy the right screws , and the more i thought about it , it came down to this , i could use the screws they included and wait for the fan to fail , or i could get the correct screws and quit worrying about it , HTH , dana
02-19-2008 12:58 AM
 
 
jschenck
Elite Veteran
Location: La Vista, NE.

Interesting because as part of the build instructions Century has you pull the fan hub screws out one at a time and add loctite. I though they could have been 1-2mm longer but they were fine. They are the flat head counter sunk screws to fit the recesses in the fan, so you were right to get the correct hardware.

I do have a call in with Century's support so I'll bet they'll correct it for me. I'll report back with what I find out!

...yep...
02-19-2008 01:37 AM
 
 
copperclad
Elite Veteran
Location: ..

hi jschenck
i thought the quality of the Century fan and hub were very good , and i am honestly not surprized if they make a mistake with the fasteners from time to time , hopefully they will be able to just post you the correct screws for the HD hub , keep us posted on your progress , dana
02-19-2008 11:21 AM
 
 
AceBird
Elite Veteran
Location: Utica, NY USA

Quote 
Good news is, at least without tightening down the bolts my clutch runout is zero. Hope it stays that way!

It will if you throw the screws away and just use cylindrical loc (green loc-tite).

Ace
What could be more fun?
02-19-2008 05:54 PM
 
 
jschenck
Elite Veteran
Location: La Vista, NE.

perhaps loctite the bolts in place without torquing them down along with a few drops of green around the clutch/fan mating. I don't think I'd feel safe having the clutch held in place with nothing other than green loctite securing it.

...yep...
02-19-2008 08:03 PM
 
 
copperclad
Elite Veteran
Location: ..

hi jschenck
if it were me , i would definitely follow Century's directions and tighten the bolts , and use the recommended thread lock , Century knows what they are doing , and a lot of people have had great success following their system , HTH , dana
02-19-2008 08:42 PM
 
 
AceBird
Elite Veteran
Location: Utica, NY USA

Quote 
I don't think I'd feel safe having the clutch held in place with nothing other than green loctite securing it.

If you let the loctite set up for 24hrs and then put in the screws it won't matter. But cylindercal loc is far stronger than the screws. If you have an old bearing and a housing you can try it and get an appreciation for its holding power.

Ace
What could be more fun?
02-19-2008 09:44 PM
 
 
jschenck
Elite Veteran
Location: La Vista, NE.

I can appreciate that the sheer strength is quite high but I would think that the continuous hammering that this joint will get could break the seal, especially 12,000+ rpm with a single cyl. engine. Plus I'd like to be able to replace the clutch if needed without heating up the assembly high enough to loosen the loctite.

...yep...
02-19-2008 10:07 PM
 
 
jschenck
Elite Veteran
Location: La Vista, NE.

I got the clutch mounted using 8mm button head bolts. Century sent them to me when I called and asked about the short clutch bolts.

The runout is less than .0005. I did snug them down just a bit with blue loctite on the threads but did not crank them down. Also I checked the level of the clutch by pointing my runout meter at the top edge of the clutch. It was way under .001

so far so good. Now I need to hack my fan shroud to fit the ESS mounts. Sure wish Century gave SOME guidance on what size to make the openings, perhaps a new discussion thread is in order.

EDIT: pix of the 6mm bolt and 8mm bolt



...yep...
02-25-2008 04:09 AM
 
 
Billme
Key Veteran
Location: MS

Just minimize the opening, and if you get them to big, just silicone the gap.. not hard at all...
Bill
02-25-2008 02:01 PM
 
 
jschenck
Elite Veteran
Location: La Vista, NE.

That's interesting, I was already contemplating sealing all the openings around the fan shroud with some clear silicone. Perhaps even cover the opening for the magnetic sensor with a bit of the 3M mounting tape I use for Gyro's - remove those air leaks!

...yep...
02-25-2008 05:05 PM
 
 
1 page544 viewsPOST REPLY
XHELI.COM . Autography FlightPower . Advantage Hobby

.
.
Gasser Model RC Helicopters > P-Gasser NX clutch question
  UPDATE SCREEN   PRINT TOPIC Advertisers 

Subscribe to This Topic

Sunday, September 7 - 1:11 am - Copyright © 2000 - 2008 runryder.com | email | link to rr | runryder needs cookie