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Tameing the Trex 250?

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Tameing the Trex 250?

Old 11-09-2010, 05:00 AM
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Default Tameing the Trex 250?

I've been flying a Blade SR and have got pretty good with it. However I recently crashed and have to replace the rotor head assembly. I can buy a Trex 250 clone for 1/2 the cost of the SR's rotor head so I think I'll go that way.

One concern I have is that I've read that the Trex 250 is a hand full to fly and keeps you constantly busy unlike the Blade SR.

I like to fly is a smooth scale like manner and was wondering if I change the blades and head speed of the 250 to be more like the SR will this calm the 250 down some?

Trex 250 runs 205mm blades at a 4500 rpm head speed

The Blade SR runs 245mm Blades at 1100 head speed.

If I Set up the Trex 250 to run 245mm blades at 1100 will this make it fly smoother scale like manner rather than a jittery little 3D machine?

Old 11-09-2010, 12:15 PM
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Default RE: Tameing the Trex 250?

Seems to me the disparity between rotor speeds is too much, and while the blade length seems compatible, the blade pitch may be different.
It's probably better to learn to fly the 250 as designed, IMHO.
Old 11-09-2010, 08:29 PM
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Default RE: Tameing the Trex 250?

go with the 250.. it flies better and can do really good 3D
Old 11-10-2010, 06:40 PM
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Default RE: Tameing the Trex 250?

The 250 is not all that bad. It will be a bit more difficult to fly then the SR just because it's collective pitch & designed to be a 3D capable machine, where the SR is fixed & designed to be stable. You can dial down the 250 just reduce your swash mix and add expo until it flys the way you like. I've also read where some have tried adding small wheel collor weights to the flybar to soften it up.
Old 01-12-2011, 09:47 PM
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Default RE: Tameing the Trex 250?

Last time I checked, my blade SR is CP. Just saying.
I to am about to move to the trex 250 and have wondered
About taming her down a bit. I don't do 3D nor have any desire.
Just a helicopter mechanic that is addicted.
Old 01-13-2011, 05:07 PM
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Default RE: Tameing the Trex 250?

The SR is CP.  I have a 250 and it is nothing like an SR.  IMO it can't be tamed down to what you have in mind.  It is too fast even lowering the swash and pitch to 8 up and 8 down.  Watch the clones too.....lots of junk out there. 

I know it may not be what you want to hear, but prepared to deal with "you get what you pay for in the 250 clone".  The only thing that settled my 250 down from being like a strung out humming bird is the 3G kit.
Old 01-23-2011, 04:56 PM
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Default RE: Tameing the Trex 250?

I have both the clone and true blue Trex 250 and I agree, in the case of the 250's you get what you pay for. I originally bought the clone because of the success I had with the clone 450 but didn't like the "feel" of many of the small parts. I bought the Trex 250 and haven't looked back. I think when the parts are as small as they are on the 250 helis the machining and plastic parts tolerances really come to light. I do believe the 250 can be a handfull to fly at times not nearly as stable as the 450. I know you asked about the 250 but a nice 450 clone can be had for a good price and they do fly great, much more stable than the 250.
Old 01-26-2011, 11:15 AM
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Default RE: Tameing the Trex 250?

I consider myself still a beginner, and have tamed my 250 down a bit just recently by using the collar weights, as mentioned above, with a tiny 5% expo on Aileron and Elevator.

These 1/16" Dubro collars fit right on the flybar. I currently have 1 on the ends of each flybar, but I have heard of some putting 2 on each end.

In the pics on this page, you can see them on the ends.

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