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T-REX 250 › servo horn distance
12-26-2008 11:10 PM  8 years agoPost 1
monkey nuts

rrApprentice

chester england

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well ive built my 250, flew it today and it seems very twitchy. its very sensitive to the controlls. i can only assume this is the nature of the small helicopter. have only really flown vario gasser/turbine.

what im asking is ive put the ball links on the horns on the end hole of the straight arm/horn. its about the 6th hole. so for small movement of the servo i have grater movement of the swash. i was thinking about move the ball link in a couple of holes to increase the movement of the servo. do you think this would give this more control? this may slightly put the push rods that go to the swash a on a little bit of an angle.

thanks
gareth

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12-26-2008 11:33 PM  8 years agoPost 2
leslie

rrKey Veteran

Hollis, NH - USA

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hi gareth,

I have my ball links on the 5th hole. This is with the align 410 servos and arms. I set mine so they would be close to 90 deg.

Two things to help with the "twitchy-ness" is to make sure your links are not tight. Use needle nose pliers to gently (real gently) squeeze the links to get them to loosen up. I have not found a decent link sizer yet. If you get the links nice and smooth, just dial in a bit of expo on the swash.

I have mine setup as above and she's really stable in a hover in my basement.

Cheers,
Leslie

Protecting those who protect us

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12-26-2008 11:52 PM  8 years agoPost 3
noz

rrNovice

cheshire

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Hi Garth
Put some expo on the aile and elev. I've added 10%. I think for your futaba you need to put a negative value in.
Rob

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12-27-2008 12:12 AM  8 years agoPost 4
docjoe

rrElite Veteran

Stockton, CA United​States

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Before dialing in any expo, you might want to check your total collective pitch as well as cyclic pitch. You can get a lot of pitch with this heli and it can be very docile. I had set it to 11 degrees of pitch with about 7-8 degrees of cyclic pitch and it seemed very tame. I did increase it and it did make it more twitchy but also more responsive. Try decreasing your ail, ele and pitch % values in the Swash AFR/mix.

Considering you've come from Gassers, the 250 is a very small and twitchy heli. You will get used to it. It is usually more difficult for those with experience with only larger helis to get used to smaller helis at first. I started with smaller and went up. I still marvel at how stable larger helis can be.

Joe
We haven't seen Colonel Angus around these parts for years!

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12-27-2008 08:22 PM  8 years agoPost 5
Richardmid1

rrProfessor

Leeds, England

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Add some flybar weights, makes it much more stable. Also after a few flights the links will loosen and it will lock into a hover better.

60% of the time, it works every time!

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12-27-2008 10:29 PM  8 years agoPost 6
monkey nuts

rrApprentice

chester england

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thanks
what percentage have you got on the swash afr?

also what tension have people been putting on the tail belt?
ive landed in the grass in my garden and tripped the teeth on the tail gear assembly, was wondering if i had the belt to tight.

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12-27-2008 11:33 PM  8 years agoPost 7
docjoe

rrElite Veteran

Stockton, CA United​States

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I am running about 50-60 on my Swash AFR. AT about 50, I get about 11 degrees of collective pitch and about 7 degrees of cyclic pitch. With this, it is quite docile. Going up to 60%, it is more twitchy but also more responsive.

Joe
We haven't seen Colonel Angus around these parts for years!

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