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Goblin 700 › Gob 700 tail blow out
06-10-2013 06:43 AM  5 years agoPost 1
foodman392003

rrApprentice

Motorcity,Hockeytown ,USA

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Having problems with my tail blowing out. Beastx and a JR 8900 tail servo. Gains are not the problem. Almost seems like I need to change the tail pulley to get the tail blades turning faster. Anyone know what tail pullys works bests at what head speed. Any one have this problem and what have you figured out.

Compass Chronos,7HVU,6HVU

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06-10-2013 10:16 AM  5 years agoPost 2
wrongler

rrProfessor

Brewerton, New York

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What size tail blades are you using?

Bill Whittaker

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06-10-2013 02:43 PM  5 years agoPost 3
kym

rrApprentice

Provo Utah

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Check your belt Tensioner I had mine on backwards. I didn't have enough tension on my belt so my tail would not hold went I push it hard.

https://facebook.com/UtahHeli

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06-10-2013 10:23 PM  5 years agoPost 4
foodman392003

rrApprentice

Motorcity,Hockeytown ,USA

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Edge 693 flybarless mains and I think Edge 105 tails. I tried and put more tension on the belt. A gobblin rep mantioned that the sweet spot for head speed was 2150 to 2200. If running lower head speed try a smaller tail Pully and get the tail blades spinning faster. I'm going to try that next.

Compass Chronos,7HVU,6HVU

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06-10-2013 10:35 PM  5 years agoPost 5
kym

rrApprentice

Provo Utah

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Your tail blades Size should be 115 I have read somewhere that they do not do well with 105

https://facebook.com/UtahHeli

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06-10-2013 10:44 PM  5 years agoPost 6
foodman392003

rrApprentice

Motorcity,Hockeytown ,USA

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You know I have to make sure on the tail blade size. They look a little wider then my other trex tail blades and I know there 105's.

Compass Chronos,7HVU,6HVU

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06-10-2013 11:50 PM  5 years agoPost 7
504Rone

rrKey Veteran

New Orleans, LA.

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You need 115s for the goblin.

NO FLYBARS

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06-11-2013 12:30 AM  5 years agoPost 8
wrongler

rrProfessor

Brewerton, New York

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Bill Whittaker

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06-11-2013 03:19 AM  5 years agoPost 9
Helico-pteron

rrVeteran

Glenview, Illinois

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Def 115s, I fly stock 700 with BeastX and never had a blow out.

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06-12-2013 03:36 PM  5 years agoPost 10
foodman392003

rrApprentice

Motorcity,Hockeytown ,USA

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I have 115 tail blade. 37 front pully, 27 rear pully. I'm going to try a 26 rear pully. See if that will puck up tail speed. Also have to ck head speed. I might be below 2150 to 2200. Thanks for all the in put guys.

Compass Chronos,7HVU,6HVU

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06-12-2013 04:15 PM  5 years agoPost 11
BigMc70

rrApprentice

Abilene, Texas-USA

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I just had the same problem show up but i have way over 200 flights on the tail belt so I'm going to change it out and see if that might be the problem.

Raymond McFaul
Team Grand RC

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06-12-2013 07:28 PM  5 years agoPost 12
foodman392003

rrApprentice

Motorcity,Hockeytown ,USA

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Yea, I don't know how old my belt is. My gobblin was used. I put a lot more tension on my belt with no change in the blow out problem. I'll try the rear gear and you try the belt and we can comparing the results.

Compass Chronos,7HVU,6HVU

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06-12-2013 07:35 PM  5 years agoPost 13
BigMc70

rrApprentice

Abilene, Texas-USA

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What is the ratio of the 27 compared to the 26 tail pully

Raymond McFaul
Team Grand RC

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06-12-2013 09:02 PM  5 years agoPost 14
foodman392003

rrApprentice

Motorcity,Hockeytown ,USA

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I don't know how to figure ratios. I was told that my tail was not spinning fast enuf but I'm leaning towards old belt because I didn't have this problem be for? I'm running a slower head speed though. Just didn't want to run it balls out all the time.

Compass Chronos,7HVU,6HVU

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06-12-2013 09:04 PM  5 years agoPost 15
foodman392003

rrApprentice

Motorcity,Hockeytown ,USA

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All my other 700e's I can just turn down the head speed and fly slower with out tails blowing out?

Compass Chronos,7HVU,6HVU

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06-13-2013 03:13 AM  5 years agoPost 16
504Rone

rrKey Veteran

New Orleans, LA.

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Mine used to blow out before I stop used full throw. The goblin has so much tail throw it will stall and cause tail blowout. What I do now is set throw equal towards the boom to whatever I get on the right.

NO FLYBARS

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06-13-2013 04:21 AM  5 years agoPost 17
foodman392003

rrApprentice

Motorcity,Hockeytown ,USA

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There is always more right then left to cominsate for torque and rotating mass. I'll keep the tail end point limiting in mind though. I have tail compensation on my 7hv and it works well. I might try adding some compensation to the goblin tail next.

Compass Chronos,7HVU,6HVU

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06-14-2013 02:54 PM  5 years agoPost 18
foodman392003

rrApprentice

Motorcity,Hockeytown ,USA

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Any up dates on the tail problems some are having? I used a cheep ball end Allen wrench while trying to remove the tail pully and the ball end broken off in the set screw. Small set back but I just pushed it away and have to get it out or cut the old set screw out and get a new pully. LOL, love it when problems start mounting.

Compass Chronos,7HVU,6HVU

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06-14-2013 07:56 PM  5 years agoPost 19
foodman392003

rrApprentice

Motorcity,Hockeytown ,USA

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Ok, was looking over my tail blades real good. Although they look great upon close inspection they seemed soft in spots like they were damaged inside? They collapse while bending. My local hobby shop did not have any 115 tail blades so I had to order them. I'm thinking they were bending in flight. Can't conferm that till I get another set of blades.

Compass Chronos,7HVU,6HVU

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06-15-2013 02:02 PM  5 years agoPost 20
rudyy

rrElite Veteran

E. Amherst, NY

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Does this happen only in crosswind condition? I have the same problem with my Goblin500 and the issue is resolved by pumping up the tail headlock gain in parameter D.

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