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T-REX 450 › Losing my tail?!
09-11-2007 02:21 AM  10 years agoPost 1
lovespicyfood

rrApprentice

Westlake Village, CA- U.S.A.

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Hello Everyone,

This has been an intermittent problem I've been experiencing on my SEv2. I now believe it was a contributing factor to a failed stationary flip because when I did that maneuver, the tail kind of fell out on itself and I lost orientation and crashed.

In normal, "non aggressive" flight, the tail holds rock solid. I can do full rudder and it will spin around very quickly and stop very abruptly. I recently dialed back the piro rate a little w/ the epa.

When I start to push the heli, the tail will sometimes get loose and not hold. When doing a fast high collective loop this past weekend, the tail "slipped out" when it was at about the 270 degree mark.

I'm using a 401/9650 on a DX7 w/ an AR7000 receiver

belt tension seems fine and I am using a Gates aftermarket belt
stock XL motor on a 12 tooth pinion
+/-10 degrees pitch, 100-90-100 idle up curve

I noticed when putting the heli in it's case after flying that the tail blades were in a different position w/ the main blades in their holder.

Is it correct to assume that there are only two possible explanations for this observation? Either the belt slipped or the one way bearing slipped?

In the last build, I'm pretty sure I changed the one way just to be sure. Could it possibly be another bad one?? I know the 600nitros have been having problems w/ their one way bearings, but I haven't heard the same about the 450.

Thanks in advance for your help in this matter. Now that I'm trying to learn 3D, it makes me very uneasy that my tail could "get loose" at any time. I have a hard enough time flying a heli that behaves as it should!

Lastly, should the one way bearing NOT MOVE AT ALL if you test it? I believe that the two prior ones I had did do that if I forced them. If this is indeed a one way bearing issue, is there a better option since I could've gotten to bad Align ones in a row?

Pete

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09-11-2007 02:34 AM  10 years agoPost 2
Gyronut

rrProfessor

Martinsville In.

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What do you think your HS is....???

Batt size..??

Mtr type..??

Check the belt for missing teeth..

Rick

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09-11-2007 02:48 AM  10 years agoPost 3
lovespicyfood

rrApprentice

Westlake Village, CA- U.S.A.

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Gyronut,

I'm guessing my HS is around 2K. I do not have a tach, this is based on reports of others using the stock XL motor on a 12T pinion w/ stock Align cf blades.

I'm using 3s2100 lipos from Maxamps (20C) and Air Thunder (25C).

I'll pull the belt out again to double check, however, a check of it before last weekends flight showed no wear.

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09-11-2007 04:41 AM  10 years agoPost 4
lovespicyfood

rrApprentice

Westlake Village, CA- U.S.A.

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I just pulled out the belt and it is perfect. Any other ideas would be much appreciated!

Thanks,
Pete

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09-11-2007 05:44 AM  10 years agoPost 5
dkshema

rrMaster

Cedar Rapids, IA

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If you're only running 2000 RPM on your 450, you're lucky to be flying at all. At 2400 RPM, the Trex only begins to perform well. At below 2000, you're stirring up the wind, but not much is happening heli wise.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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09-11-2007 05:52 AM  10 years agoPost 6
helimatt

rrElite Veteran

Lafayette, IN

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with the motor/pinion he has, and the throttle curve, no way he's running only 2000 rpm. You could get a Trex to fly at that HS however...

I guess he's closer to 2800 rpm. From the description of his problem, either the drive pulley(s) is/are slipping, or the Headspeed is bogging for some reason, and therefore losing tail authority.

You may need to back off the pitch curve (less max pitch) and/or the cyclic. Just sounds like overload on the power system if nothing is slipping. You should be able to do continuous flips with that power system no problem with the heli setup correctly.

Never, ever, ever, ever give up.

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09-11-2007 04:17 PM  10 years agoPost 7
lovespicyfood

rrApprentice

Westlake Village, CA- U.S.A.

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Thanks for the continued suggestions! I'm sorry about the HS I quoted...as helimatt pointed out, it is much higher. I just bought a 600N Pro so I've been researching those setups and it is run ~2K.

I will check the things mentioned and report back...

Thanks again,
Pete

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T-REX 450 › Losing my tail?!
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