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HelicopterBeginners Corner › A few questions
10-20-2004 05:58 PM  13 years agoPost 1
Coolrunnings

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Everett, Washington​USA

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Hello,
I am new to this forum. I am in the process building a Raptor 50 helicopter. A few questions that I have after reading some other posts. Is there a torque specification for the prop nut on the engine? I noticed there is no locking nut or lock washer, I have read that some have a problem with it coming loose, so there must be a correct spec. It is the OS 50 model, BTW.
Also, I have read some discussion about checking/setting the head speed, I am interested in knowing how is this done?
Finally, I am in the Seattle/Snohomish Washington area and am interested in finding information on times and places others are flying.
Thank You,
Mike

Why suffer insanity, relax, enjoy!

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10-20-2004 06:03 PM  13 years agoPost 2
Al Magaloff

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12,199 Posts- Enough​Time Wasted. See Ya!

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Mike, welcome to the forum. Buy yourself the OS crank locking tool from Rick's. Crank the fan down as tight as you can while holding the crank lock in place. Then apply blue LockTite to the clean threads of the crank, and apply the clean nut. Use a ratchet (3/8 drive) and socket to crank the nut down. Don't break off the end of the crank, though! Clean parts prior to LockTite with spray BrakeKleen from the auto parts store. We use optical tachometers to measure headspeed.

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10-20-2004 06:31 PM  13 years agoPost 3
yugi

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Maryland

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red locktite

Al Magaloff hit it just right. I got locking tool from Rick's and works VERY well. I would do one thing different. I always use RED locktite on the prop nut. yes, I can get it off with no problems and no heat needed! Your choice.

If you keep doing the same thing…...you’re going to get the same results!

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10-20-2004 07:07 PM  13 years agoPost 4
Coolrunnings

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Everett, Washington​USA

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Thanks for the reply. I am still wondering if there is a correct torque spec, there must be. I am sure with red lockTite etc it wont come off.
I have a optical tach, I just thought with the rotor going around there might be some ideas on how to set up for the mesurement.

Why suffer insanity, relax, enjoy!

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10-20-2004 08:46 PM  13 years agoPost 5
HelicopterJohn

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Seffner, Florida​(Just East of Tampa,​Florida)

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Welcome to RR

Coolrunnings

You said:
I have a optical tach, I just thought with the rotor going around there might be some ideas on how to set up for the mesurement.
You are on the right track by seeking help from a local experienced helicopter pilot. If you do a search they have a website I think it is called R/C Pilot Locator. It will give you a list of pilots in your area with e-mail addresses so you can contact them for help.

They will be able to look over your setup and help you with the radio setup/programming. This effort can (in my opinion) shorten the learning curve.

The combination of the amount of throttle applied (throttle curve) and and amount of pitch applied (pitch curve) will determine the rotor head RPM at any given throttle stick position. Some chose to use the mechanical linkages on the helicopter and the rado setup to control/set the RPMS. Others chose to use a governor to control the engine throttle settings and match those settings with the appropriate pitch curve to get a given result.

Read the instructions supplied with the kit. Get a pitch gauge so you can check your pitch settings for proper setup.

I am sure you will have other questions as you proceed and myself and others here will be glad to help you get your heli going.

Again, get some help before you fly. It will be worth the effort.

Best of Luck

OC Bob's Gathering #2 was a Premiere Event. Pictures in my Gallery

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10-20-2004 09:57 PM  13 years agoPost 6
Ringding

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Austria

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The propnut needs as much torque as you can squeeze out, short of Gorilla force. I did it three times with increasing torque just because it would immediately come of when I tried to fire it up.

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10-20-2004 11:01 PM  13 years agoPost 7
Al Magaloff

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No real official torque spec. Also, if blue doesn't do it, red won't either.

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10-20-2004 11:06 PM  13 years agoPost 8
Coolrunnings

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Everett, Washington​USA

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Thanks Helicopter John!

Thanks for the directory tip. I will check it out. You bet I will have someone check the setup on this. The local hobby stores have visited to don’t seem to be up on helis. I should have a pitch gauge tomorrow with some other items I ordered. I am almost at the point to turn on the power switch and do some programming and check hat sort of thing.

Ringding, as for as the prop nut question, when I was a young kid I used to rebuild high performance Chevy's engines that went very fast, so what can I say. The thought of not using a torque wrench on an engine of any kind of bugs me. I guess it's no big deal. But, there must be a specification, it is hard to believe there isn't.


Mike

Why suffer insanity, relax, enjoy!

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10-21-2004 01:38 AM  13 years agoPost 9
HelicopterJohn

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Seffner, Florida​(Just East of Tampa,​Florida)

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Loctite

"Al" was right on target when he said to clean the crankshaft and nut with Brakekleen or similar product to remove the oil residue from the parts prior to installing the nut with Loctite. Go outside when you start spraying that Brakekleen (it is not something you don't want to use in a non-ventilated place).

Also, I find that letting it sit over night and letting the Loctite set up can do no harm.

One other think you might keep in mind is the engine alignment. If you check my gallery in the section titled "Raptor Clutch Liner Replacement" you will see my thoughts on how to properly install the engine so that the start shaft/engine alignment is correct.

Just something else you might want to consider.

OC Bob's Gathering #2 was a Premiere Event. Pictures in my Gallery

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10-21-2004 03:08 AM  13 years agoPost 10
Coolrunnings

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Everett, Washington​USA

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John,
Nice Cobra BTW,

Good tip on the engine; thanks I will do it that way. I was thinking when I was putting this bird together that the reinforcement directly under the engine could be done differently to allow easier access to the engine. I have no idea, but I bet that puppy comes in and out a lot! If so I will probably make a modification, but that is me.

I like your tool you made up for the head. Looks like a must have, but I am a tool guy! If you send me a PM with details that would be cool.

I got my shipment from hellipros today. I got their $300 flight field kit with the pitch gauge included. I love Christmas! But I need to get back to watch this NY vs Boston game. It would be to weird if Boston and Huston both won in this political year!

Mike

Why suffer insanity, relax, enjoy!

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10-21-2004 03:31 AM  13 years agoPost 11
HelicopterJohn

rrKey Veteran

Seffner, Florida​(Just East of Tampa,​Florida)

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Swashplate Leveling Tool

Mike,

Sent you a PM

OC Bob's Gathering #2 was a Premiere Event. Pictures in my Gallery

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10-21-2004 09:41 AM  13 years agoPost 12
cjw

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UK - Cheshire

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Coolrunnings,

Welcome aboard

If you haven't found it already, Raptor tehnique is a great source of info:

http://www.raptortechnique.com/

I've also got some bits and pieces on my web that might help.

http://www.cjwoods.com


Good luck and stick with it. This is a great hobby but takes a lot of patience and practice.

Clive

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10-21-2004 04:51 PM  13 years agoPost 13
Coolrunnings

rrNovice

Everett, Washington​USA

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Thanks CJW,
I used the Raptortechnique site, it made the assembly quite easy. If ThunderTiger doesn't send him a check every month, they are should!
You have a nice website also. Maybe I should log my exploits. Tonight I will get the camera! I will try your pitch gauge xls. The next day or two I will set up the head, then find someone to look this over before the first start up. I have to read up in the JR manual and do some programing also. That and practice head in on the simulator!
Mike

Why suffer insanity, relax, enjoy!

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10-21-2004 05:05 PM  13 years agoPost 14
cjw

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UK - Cheshire

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Thanks for the comments

It's worth keeping a log. I found that progress tends to be fairly slow (was for me anyway) but I could look back at the log and see how I've improved - helps keep your morale up when you think you're making no progress

Also you can track back problems with your heli if mechanical things aren't going so well if you keep a maintenance log.

Clive

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10-21-2004 05:31 PM  13 years agoPost 15
Coolrunnings

rrNovice

Everett, Washington​USA

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All,
I did a cut and paste and missed something, and that is why my post above is weird. I have to read what I write, LOL!

CJW, a log is great, thanks for putting yours out there, I find in interesting!


Mike

Why suffer insanity, relax, enjoy!

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10-21-2004 05:52 PM  13 years agoPost 16
cjw

rrVeteran

UK - Cheshire

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Mike,

Looking forward to reading yours

Clive

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