First Crash....need help
01-20-2008 | 12:51 AM
#1
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From: Pasadena,
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First Crash....need help
Hey all,
Well I finally got her out to a field today...but it was windy. Not too windy but windy enough for me since I haven't flow in the wind yet....maybe around 10-15mph. Anyway, I took it up to a nice hover, then started some figure 8's but I was fighting the wind so much...and nerves that it got too far away from me and I lost orientation. The blades slammed the ground and it looked like an explosion! LOL, but from 1st appearance, it looked like only the flybar was bend and a broken tail blade and main blades. After replacing those, I found out the main shaft was bent. So I replaced that as well and checked the feathering shaft...it was fine. Spooled her up and a very strange sound....real high pitched and sounded ...well much faster than usual. After over an hour of rechecking everything, I can't see anythingn bent and all looks ok to the eye.
The one and only thing I notice different since the crash is that when I rotate the cyclic stick clockwise (with a receiver battery plugged into rcvr), it actually turns the head and rotors. This doesn't happend if I rotate it clockwise. So SOMETHING is grabbing the main shaft enough to make it turn?
Any ideas what could be causing this? I really want to fly tomorrow morning!
Thanks,
Skarn
Well I finally got her out to a field today...but it was windy. Not too windy but windy enough for me since I haven't flow in the wind yet....maybe around 10-15mph. Anyway, I took it up to a nice hover, then started some figure 8's but I was fighting the wind so much...and nerves that it got too far away from me and I lost orientation. The blades slammed the ground and it looked like an explosion! LOL, but from 1st appearance, it looked like only the flybar was bend and a broken tail blade and main blades. After replacing those, I found out the main shaft was bent. So I replaced that as well and checked the feathering shaft...it was fine. Spooled her up and a very strange sound....real high pitched and sounded ...well much faster than usual. After over an hour of rechecking everything, I can't see anythingn bent and all looks ok to the eye.
The one and only thing I notice different since the crash is that when I rotate the cyclic stick clockwise (with a receiver battery plugged into rcvr), it actually turns the head and rotors. This doesn't happend if I rotate it clockwise. So SOMETHING is grabbing the main shaft enough to make it turn?
Any ideas what could be causing this? I really want to fly tomorrow morning!
Thanks,
Skarn
01-20-2008 | 01:25 AM
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From: Torrington,
CT
RE: First Crash....need help
it may be normal for the rotor head to turn from cyclic inputs because of the one-way gear...
however, regarding your high pitched whine i would bet that your motor moved in the crash and the pinion is now hard against the main gear, OR you have stripped the main gear and it needs replacing
however, regarding your high pitched whine i would bet that your motor moved in the crash and the pinion is now hard against the main gear, OR you have stripped the main gear and it needs replacing
01-20-2008 | 10:13 AM
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From: montreal, QC, CANADA
RE: First Crash....need help
Man, I can say I have a LOT of experience in crashing and replacing parts.... I have crashed 24 times....
First of all, after any crash you have to replace the FEATHERING and MAIN SHAFT, specially if your main blades were damaged, for sure those 2 shafts will be as well, even if they don't seem to be damaged, sometimes they have been slightly bent that you don't see it but they WILL give you trouble after, just replace them after EVERY CRASH, don't even think about it, that is important if you want to have always your heli flying properly and with a good blade tracking, believe me, I learned the hard way.....
After a crash, it's important also to check your tail bool, the servo gears and the main gear, what you say about the noise, it's probably the main gear that was damaged, even if there is a little little tiny bit of gear chipped, it will affect most of the times and it will make that noise, before crashing, try to swtich the antirotation switch in order to avoid stripping the main gear (the switch that is usually at the right of the transmiter).
Really, don't waste time trying to figure out the problem, replace the parts I said and I almost guarante you that it will work excellente again, man, one thing I learned about the t-rex is that is a wonder of the world, you just have to replace the parts and it will fly as BRAND NEW again, even if you crash once and once again, anyway, if you replace the parts and some of them were not the problem you can keep them as spare for after, but you have more chances to succed in solving your problem.
I hope this is usefull
P.S. If your main shaft was bent, I am 99% sure that your feathering shaft is bent as well.
First of all, after any crash you have to replace the FEATHERING and MAIN SHAFT, specially if your main blades were damaged, for sure those 2 shafts will be as well, even if they don't seem to be damaged, sometimes they have been slightly bent that you don't see it but they WILL give you trouble after, just replace them after EVERY CRASH, don't even think about it, that is important if you want to have always your heli flying properly and with a good blade tracking, believe me, I learned the hard way.....
After a crash, it's important also to check your tail bool, the servo gears and the main gear, what you say about the noise, it's probably the main gear that was damaged, even if there is a little little tiny bit of gear chipped, it will affect most of the times and it will make that noise, before crashing, try to swtich the antirotation switch in order to avoid stripping the main gear (the switch that is usually at the right of the transmiter).
Really, don't waste time trying to figure out the problem, replace the parts I said and I almost guarante you that it will work excellente again, man, one thing I learned about the t-rex is that is a wonder of the world, you just have to replace the parts and it will fly as BRAND NEW again, even if you crash once and once again, anyway, if you replace the parts and some of them were not the problem you can keep them as spare for after, but you have more chances to succed in solving your problem.
I hope this is usefull
P.S. If your main shaft was bent, I am 99% sure that your feathering shaft is bent as well.
01-20-2008 | 12:31 PM
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From: Stockbridge,
GA
RE: First Crash....need help
In my laitest crash, that copper ring that goes on top of the main gear actually got pressed onto the one way bearing and it was causing the gear to make a high pitch noise and it would actually tourque the entire heli to the right. Double check that...
otherwise, what everyone else has said.
otherwise, what everyone else has said.
01-20-2008 | 11:30 PM
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From: Pasadena,
MD
RE: First Crash....need help
I hear ya bro. If I or my LHS had one, I'd have replaced it. But I truly believe it was fine....I took it out and it rolled perfectly on my flat countertop. I DID find a gear tooth that was mishaped...so I reshaped it with a small screwdriver and flew quite a bit today without issues!
I finally got my first lock solid nose-in hovers today!
Thanks all!
Skarn
I finally got my first lock solid nose-in hovers today!
Thanks all!
Skarn
ORIGINAL: matador_24
Man, I can say I have a LOT of experience in crashing and replacing parts.... I have crashed 24 times....
First of all, after any crash you have to replace the FEATHERING and MAIN SHAFT, specially if your main blades were damaged, for sure those 2 shafts will be as well, even if they don't seem to be damaged, sometimes they have been slightly bent that you don't see it but they WILL give you trouble after, just replace them after EVERY CRASH, don't even think about it, that is important if you want to have always your heli flying properly and with a good blade tracking, believe me, I learned the hard way.....
After a crash, it's important also to check your tail bool, the servo gears and the main gear, what you say about the noise, it's probably the main gear that was damaged, even if there is a little little tiny bit of gear chipped, it will affect most of the times and it will make that noise, before crashing, try to swtich the antirotation switch in order to avoid stripping the main gear (the switch that is usually at the right of the transmiter).
Really, don't waste time trying to figure out the problem, replace the parts I said and I almost guarante you that it will work excellente again, man, one thing I learned about the t-rex is that is a wonder of the world, you just have to replace the parts and it will fly as BRAND NEW again, even if you crash once and once again, anyway, if you replace the parts and some of them were not the problem you can keep them as spare for after, but you have more chances to succed in solving your problem.
I hope this is usefull
P.S. If your main shaft was bent, I am 99% sure that your feathering shaft is bent as well.
Man, I can say I have a LOT of experience in crashing and replacing parts.... I have crashed 24 times....
First of all, after any crash you have to replace the FEATHERING and MAIN SHAFT, specially if your main blades were damaged, for sure those 2 shafts will be as well, even if they don't seem to be damaged, sometimes they have been slightly bent that you don't see it but they WILL give you trouble after, just replace them after EVERY CRASH, don't even think about it, that is important if you want to have always your heli flying properly and with a good blade tracking, believe me, I learned the hard way.....
After a crash, it's important also to check your tail bool, the servo gears and the main gear, what you say about the noise, it's probably the main gear that was damaged, even if there is a little little tiny bit of gear chipped, it will affect most of the times and it will make that noise, before crashing, try to swtich the antirotation switch in order to avoid stripping the main gear (the switch that is usually at the right of the transmiter).
Really, don't waste time trying to figure out the problem, replace the parts I said and I almost guarante you that it will work excellente again, man, one thing I learned about the t-rex is that is a wonder of the world, you just have to replace the parts and it will fly as BRAND NEW again, even if you crash once and once again, anyway, if you replace the parts and some of them were not the problem you can keep them as spare for after, but you have more chances to succed in solving your problem.
I hope this is usefull
P.S. If your main shaft was bent, I am 99% sure that your feathering shaft is bent as well.
01-21-2008 | 04:47 PM
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From: Grand Rapids, MI
RE: First Crash....need help
If he's got a V2, the featherig shafts are larger diameter than previous versions (4 mm) and I have only had one bend on me, ever. Good idea to check it to be sure, though...
01-22-2008 | 03:01 PM
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RE: First Crash....need help
ORIGINAL: BryFlyGuy67
If he's got a V2, the featherig shafts are larger diameter than previous versions (4 mm) and I have only had one bend on me, ever. Good idea to check it to be sure, though...
If he's got a V2, the featherig shafts are larger diameter than previous versions (4 mm) and I have only had one bend on me, ever. Good idea to check it to be sure, though...
Yep V2. But I ordered extra feathering shafts today
Skarn
01-22-2008 | 03:06 PM
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From: Grand Rapids, MI
RE: First Crash....need help
Good deal. Even though the feathering shafts are really tough, it's always a good idea to pull everything apart, inspect it and also to check the dampeners. I am using Trueblood dampeners, but I have heard that there are some new ones out there that are supposed to be better.
