Friggin' Tail Locks

[skigolfmike]

Well, I finally turned my head speed high enough to get the dreaded Gaui Tail Lock. Not sure what I was turning for head speed. At 70% throttle, 0* pitch I was at 2000 and I upped it to 75% to make the head more responsive. I figure that got me to 2200+. At first I thought the gyro was going nuts, then I realized what it was. Not cool. I guess I will have to back the head speed back down to about 2000 or less until I can get the CNC tail on the bird. Flips and rolls might have to wait until then.

I did put on the lightweight paddles and I upped the cyclic from 6.5* to 8*. Will have to get it out tomorrow, weather permitting and give it a try.

[kahn10]

grrrrrrrrrrr

[michael88997]

i have the gaui plastic grips that have the upgraded thrust bearings on there and they have been good to me...

[xodarap1]

I've got two different plastic tails on the hurris and i've never had any tail problems once I finally got the belts tensioned up just right.

I don't know if i'm at 2200 head speed with the z20 and 16T, but I could be darn close to that range at 90%+ throttle. It should be near that speed with the z30 with the 13T or 14T.. but i'm not sure. All i know is that it's cookin and i wouldn't want to get hit by anything flying off of it lol.

I know that the tail linkage movement as a whole is much smoother on the z20 hurri and i haven't been able to figure out why.

Does anyone know how i can tell which plastic tail is the newer/better one?
..One of the tails (on the z20 bird) has 4 longer "pins" with retainer disks on them and the other (z30 bird's) tail has shorter "pins" which has ends that are flush with the plastic.

Why do you need to wait for 2200 for flips and rolls? They snap flip and roll fine even at much lower speeds than 2000..they just do it in slow motion.

[GatoVolador]

Adapting a Trex 600 tail is another option -- has worked great for me so far!

[X30PILOT]

I have a Trex tail case on mine with a Gaui hub and the thrusted grips.
This seems to work very well.

[Mikej]

What are the symptoms of the locking problem please ?

[skigolfmike]

It looks like your gyro went stupid and you get a pretty good tail wag. On my Hurri a little left rudder would start the shake and right rudder would stop it. When I backed off the headspeed, it stopped.

The problem with the stock tail is the bearings sit on the end of the hub. At high head speeds the bearing in the TR grips can cock against the hub, locking the tail. If the hub came out further and captured the inner races of the bearings in the grips it wouldn't have this problem.

For now, I put in lower gear. and I'm going to back off the headspeed until I get a better tail on.

[concept1]

I have been running 2100-2300 with no problems, I now have the CNC tail case but still running the stock tail grips and blades.

[skigolfmike]

I was spinning 2000 at 1/2 stick, 0* pitch and 70% throttle. The rpm picked up about at lift off. I'm guessing 2200. That worked OK, but I got occasional tail locks in flight, but it would come right out of it. At 65% throttle I get 1900 at mid stick. Last night I went through the tail and I'm going to try it again today. I also dropped a tooth on the motor from a 21 to a 20 (68T main) which should help too. Will lower the headspeed about 100 rpm. I'll try 70% throttle at half stick (0-55-70-80-90) and see how that works.

[ps61785]

well the aluminum grips from gaui dont work either...installed them last night and as soon as i went into idle up the tail locked costing me a pair of landing gear...

i am shocked as it had the thrust bearing in it and it still did...back to the plastic grips with out the thurst bearings...never had any problems there...anyone else have this problem with the aluminum grips from gaui...and if so, what is the solution...

[michael88997]

did you lube the thrust bearings and make sure everything was in there right?

[skigolfmike]

I ended up bringing down the head speed on my 550 and it still went nuts. I ended up taking off all the blades and spooling it up just to see what was going on. Turns out the OWB was shot, I had the 20T OWB so I replaced it and that smoothed everything out.

I did a little test flying tonight and it was working pretty good. I kept pushing up the head speed and no tail locks. I do have the Gaui CNC TR pieces coming. I'll take a good look at them first and then give them a try.

[ps61785]

yes i did lube everything and put the pieces back in the way they came out...the only thing that i can think of is that i should have left the tail grips loose...

....when i set it up initially it had quite a bit of play so i tried to trighten it up to eliminate the play... as this is the way the plastic grips are...

hopefully someone has some idea of how to fix this...

[GatoVolador]

Check out my Trex 600 solution:

http://www.helifreak.com/showthread.php?t=70854

Works great and costs $50. I'm done with the Gaui tail parts.

[michael88997]

my plastic thrusted grips have some play in them as well but i was flying at 100% tc so maybe around 2200 and it held fine

[kahn10]

i moved the thrust bearings to the outer end of the tail grips figuring their going alot faster than the main grips so this will help them not bind loosened the belt off quite a bit lubed the belt with teflon drylube[can but hope] and took out my owb cleaned it throughly with brake cleaner and reassembled it being very careful to not get any lube near it. i have a feeling alot of the trouble people are having is something to do with small slips of owb at high speed perhaps because they are getting small amounts of lube in there

[skigolfmike]

AFA the OWB, I think the problem with the OWB isn't lube on the bearing, it's the plastic gear slipping on the bearing. OWBs still need lube to work like any other bearing. I've never run one dry in any application.

I should be getting my new tail pieces today. I will give them a good look to see it the design problems in the original are solved or not. I have a bunch of stuff coming, CF blades, a bunch of CNC parts, etc.

[skigolfmike]

I put on the CNC tail pieces and, IMNSHO, they are junk too. Very poor design. They have more play than stock plastic grips. Looks to me like the best solution is the Finless solution with the Raptor 50 TR hub, bearings and grips.

The vibration from the TR was so bad tonight that it cracked the TR case. Basically, I'm down for now until I get new parts. At least the B400 is still flying.

[ps61785]

i had the same problem so i tightend tem up by shortening the screw...but then they locked up...back to the plastics...

[vicrc]

I am also using the Trex 600 tail grips and hub assembly. I am using the hurry tail fins and it works great. I don't worry about the tail anymore even at 2400-2600 rpm.

[BL]

skigolfmike, thanks for sharing the info.
I was about to put up order for the Gaui CNC tail blade grips and hub. I don't think will order that in near future until I see any good review for this part.

Will stick to my current trex600 plastic grips and hub.

[ps61785]

with all this talk about using the TRex 600 grips i assume that they are pretty much a direct bolt on...

If so i would also assume that the Kasama aluminum grips for the TRex 600 would be a direct bolt on too...

Am i right assuming this?

[mysticmead]

since I haven't seen the kasama grips, I can't say yes or no.. but since the stock grips and hub fit with no mods, then I would assume the kasama parts do to IF they fit the stock trex 600 with no mods.. if they require a complete kasama tail, then who knows