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10-11-2005 02:14 AM  12 years agoPost 1
BC Don

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Calgary, AB Canada

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Just finished putting the T-Rex together. Had an initial flight to check it out and get blades in sync. Today, did some basic hovering and climbs and the motor (warp 4 running the 15T Pinion) got hot. In my view, way too hot. The LiPo was warm, not a problem. This was after about 5 to 7 minutes of flight.

Problem 2, if I am hovering and give full collective, the tail will swing to the right, (nose to the left). Are these two related?

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10-11-2005 02:17 AM  12 years agoPost 2
MikeInMobile

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Mobile, Alabama

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You have too much pinion ..... switch to a 13 tooth pinion and try it

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10-11-2005 03:00 AM  12 years agoPost 3
BC Don

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Calgary, AB Canada

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Thanks Mike. Will that help with the Tail Rotor as well?

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10-11-2005 04:15 AM  12 years agoPost 4
learjetcb

rrApprentice

Topeka ks. usa

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i have the warp 4 on a 15 tooth pinon. this is great setup like that, the motor will run 180f no prob. back your head speed down to 2300 to if you can order a align heat sink and slap it on there it helps. this is a great setup with the heat sink at 2400. i run 2300 without the heat sink and that motor is fine. ok the tail is a differnt issue did you set it up in normal mode so the heli doesn't spin. if so then next set the head speed do you have it in govener mode. i run a castle 35 in gov mode. look for some good tail blade. i have glx tail blades they are corbon fiber and are sweet on the tail. i get these blades from heliaddict.com

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10-11-2005 04:31 AM  12 years agoPost 5
MikeInMobile

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Mobile, Alabama

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Just looked at the tail blades that you referenced .... they are actually made by Jet Hobby .... and you are right, they are great (I got mine from Modefos)!

I am running with a headspeed of 3200 RPM with these tail blades and the machine flies like it is on rails !

The only problem is that the tail hub shatters because of the increased stresses induced by the carbon tail blades. The increased stresses are not due to the increased headspeed, but are caused by the rigidity of the carbon blades. Since the stock tail rotor hub is made out of aluminum, it cannot take the sharp transistions created by the carbon blades without fracturing (normally, the tail blades flex, reducing the lateral impact of tail pitch changes). Microheli is about to release a steel tail hub to fix this problem !

PM'd Wes at Modefos and he will get them as soon as they are available (currently scheduled for the last week of October .... a perfect Halloween purchase )!

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10-11-2005 03:11 PM  12 years agoPost 6
BC Don

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Calgary, AB Canada

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Learjetcb, I'll take a reading on my motor the next time. I could put my finger on it but couldn't leave it there, I figured that was hot. But I didn't take a temp reading. 180F you say is OK?

I'm running with a CC35, it only warms up a bit, and the battery only warms up a bit. Didn't have anyone available to check out blade speed so I'll have to do that. I was running in governer mode at 90%.

As far as blades go, I purchased the optional Align carbon fiber ones. I still have some setup to do as I noticed that in "Normal" mode I get some drift of the tail to the right (ohhhhhh and I'll double check to make sure all REVO Mixing is out but I "think" it is).

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10-11-2005 04:20 PM  12 years agoPost 7
VinceHerman

rrApprentice

Wadsworth, OH

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I would agree with others that dropping the pinion size will help with motor temp. I also think that you need to drop your pitch curve a bit. Having the tail lose authority in climbout is a pretty good indication that the head speed has dropped too much, or was not high enough to begin with.
Vince

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10-11-2005 04:21 PM  12 years agoPost 8
learjetcb

rrApprentice

Topeka ks. usa

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yeah if you don't have a heat sink i found over 2300 it gets hot. that motor has no problems at a constent 180. i have run it like that allot. i ran faster around 2500 and the motor was like 230 or so with no prob. they say that motor runs hot any how and 180 is safe. my throttle curve in normal on my 10x is 38 and stunt mode 40 throttle curve is 2300 without heat sink. and with the heat sink 45 throtle curve is 2420. my gov mode is set in the high mode on the cc35. This still let me fly 10 min doing kaoses, hurrecanes, funnels, flips, rolls, tic tocs, and rainbows, the entire flight.

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10-11-2005 04:44 PM  12 years agoPost 9
BC Don

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Calgary, AB Canada

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I have the heat sink on it. I'll measure the temp to find out what it is "really" at and check head speed as well, hopefully that'll sort it out.

I was just happy getting it up off the ground and doing a bit of hovering yesterday. Had already crashed my 50 size heli - something loosened upon the tail.

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