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Antiques or Out of Business > GMP Cobra being revived!!

heli_headcase
Veteran
Location: Hovering around Atlanta

FF Test...

Wanted it to be on topic

HHC

So many heli's - too little time...

01-28-2008 12:04 AM

heli_headcase
Veteran
Location: Hovering around Atlanta

I may be able to help...

Quote
does anyone know the size that holds the carb on to an Enya 60X?

Give me a little time to check my Enya 60X and I'll let you know. But the guess of M4 X .75 could be perfect. That's JIS threads.

HHC

So many heli's - too little time...

01-28-2008 12:09 AM

GMPheli
Veteran
Location: W. Bridgewater, MA USA

It's working now, but no zip files

01-28-2008 12:21 AM

GMPheli
Veteran
Location: W. Bridgewater, MA USA

I think I can get a 4x.75 die at Wholesale tool. I will just run some 4x.70 setscrews thru it. I am putting an OS 60B carb on my 60X. BTW, what was that canopy painted with? It looks nice!!!

01-28-2008 12:22 AM

GMPheli
Veteran
Location: W. Bridgewater, MA USA

Some pics of the heliball

01-28-2008 12:30 AM

GMPheli
Veteran
Location: W. Bridgewater, MA USA

Has some red paint on it though

01-28-2008 12:32 AM

coop
Senior Heliman
Location: Bainbridge, NY

Just saw your post....Did you find a heliball that will fit your Enya? If not, I have one you can have, I know it fits, I had it on a 49HH Enya that I had in a Cobra years ago.

Coop

Under edit....Alan's faster typing than I am, posted while I was typing...

01-28-2008 12:32 AM

GMPheli
Veteran
Location: W. Bridgewater, MA USA

Hey Coop, good to see you are still around. Time to dust of those oldies and come to IRCHA this year!!! You should finish the Jet Ranger and bring it!

01-28-2008 12:34 AM

coop
Senior Heliman
Location: Bainbridge, NY

Yea Alan, I'm still around, been lurking here more lately...I've been out of the helis 3 years now, been thinking it's time to get something in the air again, see if I can still fly. I've got my Bergens, and a ton of GMP stuff, can't sell it, might as well fly it.

Coop

01-28-2008 12:39 AM

GMPheli
Veteran
Location: W. Bridgewater, MA USA

So you think you might make it to IRCHA? I am going to try!

01-28-2008 12:42 AM

jczankl
Senior Heliman
Location: Anderson, IN USA

Nice Cobra HHC

Team Cajun Helicopters,Team Futaba,WildCat Fuels,V-Blades,Duralite Batteries,Zurich,Vel-Tye,

01-28-2008 01:22 AM

HOMEPAGE

heli_headcase
Veteran
Location: Hovering around Atlanta

Quote
I think I can get a 4x.75 die at Wholesale tool. I will just run some 4x.70 setscrews thru it. I am putting an OS 60B carb on my 60X. BTW, what was that canopy painted with? It looks nice!!!

Working backwards, I know nothing about the paint. That's a picture from my heli archives, probably "borrowed" from an eBay auction

Sorry.

I checked the 60X screws and they are definitely .75 pitch. I wouldn't bother with rethreading M4 x .70, use 8-32 instead. The pitch is very close with only a slightly larger diameter OD.

Unless modifying the engine is "against your religion", just run an 8-32 tap into the case holes. Much easier to do than rethreading screws.

HHC

So many heli's - too little time...

01-28-2008 01:30 AM

CoastalTom
Senior Heliman
Location: Foley, AL (7 miles N of Gulf Shores/Orange Beach)

GMPheli (Alan) is a good guy! He's helped me out with several parts for my Cobra restoration project.

Tommy Patterson - Gulf Coast Aerials

01-28-2008 02:46 AM

HOMEPAGE

baby uh1
Heliman
Location: St. James, Mo.

Cobra Project

I too am restoring a Cobra. Actually finishing it would be more accurate. I have one that was never totally built and has a brand new OS50 in it. I plan to get it flying and then just use it for hovering and mild flying and maybe some camera work if it is as stable as I hope it will be.
Should be a rather heavy 50 so the wind shouldn't be a problem.
I also would like to throw this out there. Ray's Helicopter book (the old one) is just full of information on this heli and others of the time. If you can find the book get it.

01-28-2008 03:14 AM

GMPheli
Veteran
Location: W. Bridgewater, MA USA

Well thank you Tommy, and HHC I think I will just tap them to 8-32. Thanks,

Alan

01-28-2008 04:52 AM

RadioFlyerMk
Senior Heliman
Location: Trenton, Ohio,

Man guys I appreciate that help so much. GMP is helping me out with the muffler there coop...I appreciate the offer too! Sounds like we are gonna make a good showing at IRCHA this year. We should be sure to get a group photo. I plan on camping a night or two...and anyone is welcome sharing shade with me. We should have two canopies and plenty of table room and as many parts as I have to bring.
After todays flying I have to dig into my parts box...again...this flying backwards crap is really annoying me.

One of these days I will get it down, maybe. At least is was just a trex 450 so parts are cheap....mostly. And I have most everything. So, there is something else I need to work on now. Just when I get 'em all fixed and flying, I had to go flying....

As for "on topic" here...Cobra is looking nice...with a new canopy in the horizon and thanks to GMP Heli...the muffler issue will now be handled...I am quite well under way.

I really don't know what ever possessed me to visit an antique heli project. I guess it is for appreciation of what "they" went through for me to be able to enjoy this great hobby all modernized. The thought had crossed my mind at one time to refinish this heli and donate it to the museum. But you know...I think making a debut at IRCHA and the other local fly ins I usually attend will be well received and appreciated. I can say that I have thoroughly enjoyed reviving this machine so far.

IRCHA....should we wear bell bottoms...

Thanks much to everyone for their help and support. This has helped me stay on track and I have gotten more done in the last few days then since I have had the machine. By the way...I finally tackled the head and it is reinstalled and all the linkage has been made and attached. I need to find the gyro (MIA) and start on setup. I should be ready for a test hover in a few weeks or less. Its clean and looking pretty good. I hope I can do a good job on the canopy, something that will compliment the machine well. I will post some completed pics here soon. Oh yeah...I got the original fuel tank today, so I will install that in the next day or two.

BTW: How much pos an dneg should I program into the machine?

Wow, this is getting scary close now...I am a little nervous.

Do you all think I will be doing the right thing if I go with wood tail rotors?

-----------------------
"I'd rather hover a Heli......than fly a plane"

01-28-2008 07:27 AM

GMPheli
Veteran
Location: W. Bridgewater, MA USA

With these 2 mods I can get quite a bit of collective without interaction. This is on my Competitor but it will work on a Cobra. I think it is around 18 degrees with a good amount of cyclic. I forget as I did it years ago. The pushrod goes from the elev and air servo to the lever and then to the bellcrank/lever. This creates a parralelogram and eliminates interaction. The 1st Hirobo Eagle used a system very similar. The balls on the sides of the mixing levers in the head allow more collective/cyclic range without binding. The GMP Stork has similar levers, and Yale offered an upgrade.
And I believe most of the interaction was at extreme negative pitch. I think a stock pitch range of 10 to -4 was not to bad, but watch your cyclic at extremes (stick in the corners) Again this was a long tome ago

01-28-2008 06:06 PM

RadioFlyerMk
Senior Heliman
Location: Trenton, Ohio,

I was going to ask you about that. My computer died on me last night and Ijust now got backon line to ask, and now...I dont need to. Thanks for the info. For what I am wanting todo with this bird the stock pitch range will be fine.

-----------------------
"I'd rather hover a Heli......than fly a plane"

01-30-2008 05:57 AM

RadioFlyerMk
Senior Heliman
Location: Trenton, Ohio,

Pretty much at a stand still waiting for some parts. Thanks to some of you, I am going to be able to get those parts! You guys have been great. I will be posting my progress and pics.

Now, I guess my next dilema is, should I run a a mechanical gyro or something modern. I have a GY240 just sitting here and I also have an older hitec gyro here. So I can go either way. Anyone have any ideas or input? The older gyro would be closer to the old school way of flying. SO I am leaning that way, unless someone has a good reason not to. Any thoughts are surely welcome.

-----------------------
"I'd rather hover a Heli......than fly a plane"

02-04-2008 07:23 AM

F3CWNB
Senior Heliman
Location: Napier, New Zealand

Quote
The older gyro would be closer to the old school way of flying. SO I am leaning that way,

I argee - Totally

'Life' is Looking Up!!!

02-04-2008 08:02 AM

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Antiques or Out of Business > GMP Cobra being revived!!

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