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HelicopterThunder TigerOther › Today's gift of enjoyment.. TT50 crank breaks
09-02-2003 12:04 AM  14 years agoPost 1
ZZ3AstrorrVeteran - Panama City, Fl - My Posts: All  Forum  Topic

GRRRR...

And I knew something was wrong.. I flew it once on Friday (storm blew in 5 mins into the first flight) and there was a strange vibe in the vertical tail fin. I planned to fly today and then do a tear down to find out where the vibe was coming from. Obviously the heli showed me the problem on its own. No problem auto but I was doing some crazy stuff just 30 seconds before flipping to upright and then the sound started. Two seconds later the engine power was completely disengaged from the mains. Good thing I'm quick on the throttle hold and auto.

I don't think this is the first TT crank I've seen break at this location.. seems like someone posted a pic just like this a while back.

Too bad this failure doesn't explain the FFF pitching down problem I can't seem to cure!! Also the fan is ruined because the portion of the crank shaft and nut is still threaded in the hub.. I tried in vain to remove it, slipping the plastic fan on the aluminum hub with no progress. At least it didn't break INSIDE the crankcrase.. this is (was) one great running TT50 and I'd hate to see the internals ruined. Wonder how much for a new crank?

Aeolus 50 3D CF - 8FGH/R6008HS - GY520/BLS251 - BLS451 x 3 - Multigov - S3155 - YS56

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09-02-2003 12:24 AM  14 years agoPost 2
G.Man

rrProfessor

Bristol

My Posts: All  Forum  Topic

FFF pitching down is due to tail being too heavy...

you have trimmed out the imbalance and in FFF it makes it pitch down...

Balance heli properly and it wont pitch down...

Don't Email me as I wont reply - PM Only (spam countermeasures)

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09-02-2003 01:13 AM  14 years agoPost 3
smity777

rrVeteran

California

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That broken crank wouldn't be considered a flaw? I would at least call customer service to ask before ya buy. Send them the pic or link it in an e mail

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09-02-2003 03:15 AM  14 years agoPost 4
Al Magaloff

rrMaster

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

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Ditto on the tail heavy. How are you picking the helicopter up when you check the balance? If by the flybar, you could be being lied to.

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09-02-2003 04:11 AM  14 years agoPost 5
ChrisLaFollette

rrVeteran

Altha, FL

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Sorry Steve! I let ya fly mine next weekend when i see ya.

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09-02-2003 04:14 AM  14 years agoPost 6
ChrisLaFollette

rrVeteran

Altha, FL

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Why dont you get like a ummm. I dunno lol make sumthing. You can do it! Drill it out then like i dunno make sumthing to grip the thing and spin it out.

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09-02-2003 06:13 AM  14 years agoPost 7
ZZ3Astro

rrVeteran

Panama City, Fl

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For the pitching.. I checked it using the main shaft and holding the heli by the grips.. it's right on... slightly tail heavy with full tank and slightly nose heavy when empty.

Also:

-flown with and without the horizontal fin

-replaced any links on head with even a hint of wear

-replaced washout base

-added servo center support on the elevator and collective

-tried several different blades (tt carbon, gammas, tt wood)

-stock paddles and lightened stock paddles

-paddle alignment in many variations

-replaced dampners (stock replacements)

-greased and regreased spindle

-did the head flip

Right now I'm down to the hub.. it doesn't fit the main shaft tight at all, but then all R30 and R50's I've checked are this way.

Of course none of this matters now that the engine is out of order!

steve

Aeolus 50 3D CF - 8FGH/R6008HS - GY520/BLS251 - BLS451 x 3 - Multigov - S3155 - YS56

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09-02-2003 03:43 PM  14 years agoPost 8
damaen

rrVeteran

Umeå, Sweden

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Just use a tool to hold the hub and then remove the nut and portion of the crank. I worked for me after my Webra 35 did the same as your TT50.

Henrik

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09-02-2003 04:06 PM  14 years agoPost 9
Paul_C

rrVeteran

Limpopo, South Africa

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Just add some weight to the nose anyway and try... once you get the motor fixed, that is.

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09-02-2003 04:35 PM  14 years agoPost 10
byoung

rrNovice

Grand Rapids, MI

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crank

I have not seen a TT50 do this, but I did have a TT90 when they first came out and it broke just like that.

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09-02-2003 06:27 PM  14 years agoPost 11
haz

rrApprentice

Rio Rancho New Mexico

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tt 50

my r50 use to have the pitching in ff i changed the fly bar and it fixed the problem. it looked liked the set screw slot on the fly bar was machined wrong.

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09-04-2003 09:08 AM  14 years agoPost 12
Stet

rrElite Veteran

Key Largo FL

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check the fan balance, still it should not break there. Get an OS and forget the TT engines, not worth the trouble.

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09-04-2003 01:15 PM  14 years agoPost 13
psawya

rrKey Veteran

Woodinville, WA

My Posts: All  Forum  Topic

Pitching could be main blade related. I had a set of mains that would cause my R50 to take a nose dive in FFF. I replaced them with a set of MA 600's and had no more problem.

Pete

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09-05-2003 03:33 AM  14 years agoPost 14
Pickle

rrNovice

Shorewood, Illinois - USA

My Posts: All  Forum  Topic

By chance do you tend to FFF in a different mode, with a different trim?

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HelicopterThunder TigerOther › Today's gift of enjoyment.. TT50 crank breaks
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