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HelicopterCentury Radikal G20-30 N640 Hawk Predator › OK, I give up please help me
09-07-2003 04:31 AM  14 years agoPost 1
blockatvalpo

rrKey Veteran

Reston, VA

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OK, I give up completly on getting the main shaft out of the Hawk Sport. The main gear is stuck with those e-clips on the main shaft and for the love of me I can't get it off. How do you get it off? Obviously I crashed the heli yesterday while flying and now it is time to check over the heli. I think the main shaft is bent, but I can't tell. I figure it is better to change it verse take a chance. What else is worth checking on the Hawk. Does the start shaft bend? I crashed into beans and the boom didn't even get scratched. The guys I fly with think the main shaft will be ok, since it didn't go in that hard, but I rather be safe than sorry. I can't see anything else that is broken. I checked the links, I lost the aileron one when it crashed. Not sure if I should order a tail shaft or not. I might just to have an extra one. I think before I go out next time I will check to make sure that the tail doesn't get past the 90 degree on the tail shaft. This way it won't lock up again. Dumb mistake, but it happens. I should have checked the end points on the servo, but I was dumb and it locked up.

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09-07-2003 05:53 AM  14 years agoPost 2
Mad-Maxx

rrApprentice

Lakeview NY

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To get the main shaft out u need to loosen the set screw in the collar just under the top bearing block then use Pointy needle nose pliers ( i dremeled mine) make the holes in the clip face one of the side frames use the pliers in the holes of the clip to spread it open a little and then take a small thin regular screwdriver and pry the side up and over the rib on the main shaft

The clip DOSENT need to come off (and wont lol been there tried that)
All you have to do is spread it enough and pry it up from the side !!!
BTW a third hand helps for the prying part
also the gear will come out the side with a little persuasion do it at an angle. Note the way things come apart theres a oneway bearing in there that u dont want to put in wrong when reassembleing
Its a pain but once u do it a couple times its easy i can do it alone now lol seems i like hard landings

Roll the shaft on glass to see if its bent

Check all gears for missing or chipped teeth
Check your Feathering shaft which is inside the head between the blade grips
Check all your mechanics to insure free movement and no binding
Some times its tuff to see cracks in the plastic make sure u look it over real close exspecialy the blade grips main and tail
I had a boom strike and i missed a crack in the arm on the tail where the ball is for the rudder control arm which caused me my 2nd boom on my next flight !!!

If u didnt boom strike and boom isnt harmed id say its fine just spin it to insure wire drive is intact

Word of advice - check, recheck, and then check again !!!!
If you fly with other heli pilots ask em to look it over b4 u go up somtimes they will see things that u missed

I for one have trouble with the obvious at times

well hope that helps

Max (must be Mad INDEED)

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09-07-2003 06:01 AM  14 years agoPost 3
blockatvalpo

rrKey Veteran

Reston, VA

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Wow, looks like I got work ahead of me. I will try and see if I can get it out tomorrow afternoon. One of the guys I fly with has a Hawk so maybe he can give me some pointers on getting it out. I will definitly have one of them check it over. I have checked once, so I know I have a couple more times of checking. I want to make sure I get everything I need for it.

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09-07-2003 06:05 AM  14 years agoPost 4
Mad-Maxx

rrApprentice

Lakeview NY

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hers a nice upgrade to stop the binding on tail but proper set up of throws is still needed

http://www.heli-world.com/Merchant2...ct_Code=CN2282P

Got one on my raven

that is a five minute job to take the main shaft out with the third hand thrown in !!!!

Max

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09-07-2003 10:12 AM  14 years agoPost 5
Phil_Mart

rrVeteran

Newcastle UK

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Look in your local tool shop for a pair of 'C' clip pliers. They will make removing the clips so easy, they'll be off in 10 seconds

The other thing I found when removing my main shaft the first time was that the bottom end had a very slight deformation to it. This meant it wouldnt go through the one way bearing. A dremil soon sorted that

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09-07-2003 12:12 PM  14 years agoPost 6
SteveH

rrProfessor

Texas

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Guys,

Unless I've missed something here, there's no reason to take the autorotation unit (C clips) apart to remove the main shaft. And if the main gear is not damaged, and the autorotation unit is functioning correctly, there's no need to take it apart either.

To remove the main shaft, after removing rotor head, washout unit, and swash plate, loosen set screws in retainer ring just under the top mainshart bearing, remove cross bolt under autorotation unit, and pull mainshaft straight out the top. After the mainshaft is out, the autorotation unit with main gear can be removed out the side of the frames.

I would not worry about the start shaft as long as it is still operating smoothly, but do check the feathering shaft, as they bend easily in the Hawk.

The government cannot give you anything without first taking it from someone else.

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HelicopterCentury Radikal G20-30 N640 Hawk Predator › OK, I give up please help me
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