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HomeAircraftHelicopterHelicopter Main Discussion › trex 450 se v2 tension.....
08-29-2013 05:21 PM  5 years agoPost 1
emederos

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Miami, Fl Dade

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My main rotor and tail blades seem to stop really quick after cutting the throttle. My trex 500 (shaft driven) when i cut the power it spins for like 13 seconds until they stop. I know belt driven has the tension of the belt that can cause it to spin less but 3-4 seconds seems to be too fast to me. What can i do in regards to fixing this issue. I also notice my battery gets hot alot more than normal. I am using 2200mah 3s 30c disch. What tips will you guys give for me to fix this issue?

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08-29-2013 05:42 PM  5 years agoPost 2
Busher

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Manchester, England

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Hot motor, definately check tension on tail belt, it should only be tight enough to do the job, I prefer mine a bit on the slack side, just tight enough to do the job without slipping, then I use silicon oil on the belt, this reduces friction by a large amount, to test this I took the main blades off and spun the head up at 1/4 throttle I then oiled the belt at the back opening near the tail. I heard the heli speed up as I was doing it a few drops is all you require do not flood it. This will also help out with static.
Then check your pinion to main gear mesh is not too tight there should be a small amount of backlash across the whole mesh with just a few tight spots if your gear is a bit out of round. Then check your motor is in good condition and your esc is set to the right frequency etc.

Good luck
Busher

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08-29-2013 07:11 PM  5 years agoPost 3
Kauaiguy

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Hawaii

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Is your owb working when you shut off power to the motor?

I'd rather be flying!

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08-29-2013 08:48 PM  5 years agoPost 4
cudaboy_71

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sacramento, ca, u.s.

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places to look:
• motor to pinion mesh too tight (slip of paper method works well on that size)
• tail belt too tight (i used to run mine SUPER loose..almost to the point you could spin the tail by hand and make it jump a tooth. you really can't run it too loose)
• bad oneway
• bad mainshaft bearings
• depending on the age of the 450 there were several methods to get the main shaft vertical lash set:
too many shims under the main shaft flange OR shaft collar set too tight against the upper bearing.
• oneway sleeve is scored/dry. replace/oil as necessary
• check all the other bearings: motor bearings; upper and lower on the front vertical tail pulley; both tailshaft bearings.

that's about all there is that would affect the spooldown.

if it ain't broke, break it.

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08-29-2013 10:52 PM  5 years agoPost 5
emederos

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Miami, Fl Dade

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anyone else have a 450 that can tell me how long it takes for you to spool down after you cut power maybe it's just me and not really a problem I'm just comparing it to the 500 that I have which is shaft driven and that takes a lot longer to spoil down maybe because there is no belt and tension

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08-29-2013 11:03 PM  5 years agoPost 6
Kauaiguy

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Hawaii

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Mine take about 20 seconds with 350 blades.

I'd rather be flying!

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08-30-2013 12:18 AM  5 years agoPost 7
emederos

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Miami, Fl Dade

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Wow mine takes 5 seconds somethings not right probably explains why my battery is getting hotter than my esc, literally hot to the touch

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08-30-2013 12:26 AM  5 years agoPost 8
Kauaiguy

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Hawaii

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When you spin the blades by hand even how hard does it feel.Mine is frictionless with the owb disengaged and still pretty easy turning the motor.

I'd rather be flying!

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08-30-2013 12:45 AM  5 years agoPost 9
emederos

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Miami, Fl Dade

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When spun by hand i do feel some tightness i think the first step is to spray silicone on the belt will that help the friction a bit? I tried to see if i can move the boom forward to loosen the belt about a 1mm or 2 but one of the boom screws are stripped so have to find a way to get it out but for now should i spray silicone on the belt and run 1/4 throttle to let it lube up?

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08-30-2013 01:07 AM  5 years agoPost 10
cudaboy_71

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sacramento, ca, u.s.

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silicone is used on belts to mitigate static. i don't think it will help at all with tightness unless you're applying it to bad bearings. i mean it's not going to hurt anything. so, may as well give it a shot. just don't expect much.

you're going to have to deal with the stripped screws eventually anyway. i'd vote for loostening the belt. that, or just fly it as is.

if it ain't broke, break it.

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08-30-2013 01:16 AM  5 years agoPost 11
emederos

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Miami, Fl Dade

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What do you mean by static and how is static bad relating to belts?

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08-30-2013 01:23 AM  5 years agoPost 12
cudaboy_71

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sacramento, ca, u.s.

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no 450 i've ever flown is affected by it. mainly 500s and larger. the belt can build a static charge (basically a van degraaff generator), then discharge across your airframe potentially rebooting your RX or affecting your FBL unit in nasty ways. and, yes it is an issue.

silicone spray is a known temporary fix. grounding the tail to the frame is a permanent one.

like i said--not an issue on 450s. but, like i also said, it can't hurt anything.

if it ain't broke, break it.

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08-30-2013 02:01 AM  5 years agoPost 13
nick.gruber

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Lincoln, NE

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The only thing that makes since to me is the one way bearing is sticking or something. The rotor blades will continue to spin after the motor stops but if they stop to quick it seems it would have to be the one way bearing. My 450 is the v2 with a torque drive and takes roughly 10 seconds to coast down.

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08-30-2013 02:03 AM  5 years agoPost 14
nick.gruber

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Lincoln, NE

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Another possibility might be the main shaft bearings wore out or sticking.

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08-30-2013 02:04 AM  5 years agoPost 15
Kauaiguy

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Hawaii

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Use a Dremel tool with a thin cutoff wheel and cut a slot in the striped head.Loosen the belt.Remove belt and check if its still hard to turn,that will determine if its tail or main related.

I'd rather be flying!

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08-30-2013 02:05 AM  5 years agoPost 16
cudaboy_71

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sacramento, ca, u.s.

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Or the main shaft is shimmed/collared too tightly.

if it ain't broke, break it.

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08-30-2013 02:24 AM  5 years agoPost 17
emederos

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Miami, Fl Dade

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Makes sense about the bearings and collar. I may just order new main shaft and collar and install it. For now im going to buy the silicone spray.

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08-30-2013 02:44 AM  5 years agoPost 18
nick.gruber

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Lincoln, NE

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It may not be the shaft but more like the two bearings that it sits in. If you're going to order anything probably a new one way bearing and main shaft bearings. You shouldn't need a new main shaft unless of course its bent. Also, you shouldn't need any shims or collars since the problem may be that you have to many.

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08-30-2013 03:48 AM  5 years agoPost 19
cudaboy_71

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sacramento, ca, u.s.

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nick: this is an SEV2. those shafts don't have the flange on them to shim. so, there are no shims. just a collar you tighten down against the top bearing.

if it ain't broke, break it.

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08-30-2013 02:15 PM  5 years agoPost 20
nick.gruber

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Lincoln, NE

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Oh ok wasn't sure. Thanks

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HomeAircraftHelicopterHelicopter Main Discussion › trex 450 se v2 tension.....
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