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Home✈️Aircraft🚁HelicopterGasser Model RC HelicoptersOther › Spectra-G clutch question Pics added
02-27-2010 10:25 PM  10 years ago
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Sean Bosse

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Germantown, MD.

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Spectra-G clutch question Pics added
So I took my Spectra out for another round of break-in hovers. Everything seemed to be going fine until I pulled the spark plug to check the air/fuel mixture. While doing this, I noticed that my clutch bell was HOT, hot to the point that I couldn't touch it for more than a half second. This seemed odd to me, however, everything seemed fine otherwise. There was no slippage up to this point, so I re-installed the plug for another flight. I got the bird into the air and again, everything seemed normal for a rich engine. This went on for a about five min. and I brought the heli down. After I landed I noticed a burnt brown powder covering the engine and areas around the clutch. Once I stopped the blades, I noticed what I thought was a brown leaf that had blown on to the heli was actually a large piece of the clutch liner. I looked closer and realized that the clutch liner was completely detached from the clutch bell.

I'm not sure what the cause of this is. The clutch liner was just replaced at MA as of one month ago and I have a little more than a gallon through it. Has anyone had a similar issue with this? I used the alignment key when I installed the engine and clutch unit. Does anyone have any tricks in setting the alignment up if that is the issue?

So is this part of the "GASSER" learning curve?
Thank you,
Sean
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02-27-2010 10:37 PM  10 years ago
Carey Shurley

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Orlando, FL - USA

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hey sean

this model was hot started before you got it right?

did you replace the clutch itself? I know you had the liner replaced.

turn the model on its side and look at the tips of the shoes very closely. If it was NOT replaced, one of the shoes or a tip may have tempered in the hot start and cracked or broken off
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02-27-2010 10:46 PM  10 years ago
Sean Bosse

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Germantown, MD.

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Thank you Carey Shurley. Yes, this did have a hot-start by the previous owner. When I had everything apart before I sent in the clutch, I checked it and couldn't see any hairline cracks or chips. The tips were a little blue, but it was only a small amount, maybe an 1/8th of an inch in diameter on each. When I spoke to MA before sending the clutch in, I was told that it shouldn't need to be replaced. I'm at school right now, but I'll try to get it apart later tonight to check everything and report back.

Thank you,
Sean
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02-27-2010 11:58 PM  10 years ago
pphil611

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South Dakota

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(While doing this, I noticed that my clutch bell was HOT, hot to the point that I couldn't touch it for more than a half second. This seemed odd to me, however, everything seemed fine otherwise)
----------------------------------------------------------------
slipping = friction
friction = heat
I noticed a fine powder deposit on mine once when breaking in the engine. I believe it was caused by low clutch (engine)RPM and too much pitch, anyway I got the RPM up some and didn't have any more problems, still running with the same clutch after more than a year.
Spectra-G, MAH, CSM
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02-28-2010 12:04 AM  10 years ago
rbort

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Franklin, MA - USA

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Sounds like a clutch liner lemon
You should just take the unit back out and send it to Minair. I'm sure if they lined it for you they will reline it probably with no charge but don't quote me on that.

The Spectra-g clutch will last 400 flights or 100 hours before it wears enough to start enguaging at higher speeds and warrant a relining event. I got mine done at around 400 flights and again at 750 or so before Minair moved to Montana.

If you have no hot starts, even if you crash unless you chicken dance expect about a 100 hour life cycle.

-=>Raja.
MA 1005 Hanson 2703D, 4400 flts
Spectra 27 3DMax, 3460 flts
Whiplash V1-2 Hanson 300, 1995 flts
Whiplash V2 Hanson 300, 923 flts
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02-28-2010 12:26 AM  10 years ago
Sean Bosse

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Germantown, MD.

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Cool, thank you Raja and pphil611! No 100 hrs here, maybe 2. I don't know what caused this. I'll try and tear it down this weekend and take some pics. I hope they do honor a replacement, being a broke student sucks and I don't know if I can afford it otherwise.

Sean
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02-28-2010 07:12 AM  10 years ago
Sean Bosse

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Germantown, MD.

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Okay, this sucks! Not only do I need to replace the liner, but the clutch as well.

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02-28-2010 08:58 AM  10 years ago
shawmcky

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Isle of Wight,United Kingdom

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That clutch
Looks as though you have had excessive clearance between the shoes and liner,too large a gap.The shoes have over extended,you will need new parts but check the clearances when the parts arrive.Looks like there must have been a mismatch.
Team- unbiased opinion.K.I.S.S principle upheld here
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02-28-2010 04:23 PM  10 years ago
rbort

rrProfessor

Franklin, MA - USA

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What's the bow?
Is it me or is there a bow below the clutch in the cf material? Not sure if that is the case or if that is an optical illusion?

In any case, looks like what happened in your clutch is that the liner broke off, and then the clutch expanded more and rubbed on the walls and got how turning blue.

You'll be best off with a new clutch and having the liner relined.

-=>Raja.
MA 1005 Hanson 2703D, 4400 flts
Spectra 27 3DMax, 3460 flts
Whiplash V1-2 Hanson 300, 1995 flts
Whiplash V2 Hanson 300, 923 flts
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02-28-2010 04:59 PM  10 years ago
Sean Bosse

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Germantown, MD.

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Thanks guys. Raja, what do you mean about a bow? Are you talking about directly below the clutch? If so, it may be the clutch liner that is hanging down giving the appearance of it being bowed.

Sean
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02-28-2010 05:12 PM  10 years ago
bwarkent

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Houston Tx

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Check your upper clutch bearing block bearings. Maybe it's just me but the upper part of the shaft appears to have been spinning in the bearings. This would cause excess heat and result in liner coming loose.
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02-28-2010 05:17 PM  10 years ago
rbort

rrProfessor

Franklin, MA - USA

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What I would do
Just send the whole thing back to Minair. Call Jeff Miller and tell him to redo it for you so its like new again.

-=>Raja.
MA 1005 Hanson 2703D, 4400 flts
Spectra 27 3DMax, 3460 flts
Whiplash V1-2 Hanson 300, 1995 flts
Whiplash V2 Hanson 300, 923 flts
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02-28-2010 05:24 PM  10 years ago
smallplanes

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S.C. ,SSA

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I had the samething happen to my Spectra from brand new and i never had a hot start. Heliproz got it cleared up fast.

Thanks

Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br
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02-28-2010 05:27 PM  10 years ago
Mike545

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gettysburg, pa

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I guy that i know, who has been flying ma birds since day one, said, you can save the clutch and I think the bell is ok, just check the bearings and install a liner yourself. it wont cost you any more than a liner at this point."always feel thankful..... never entitled"
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02-28-2010 05:50 PM  10 years ago
pphil611

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South Dakota

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clutch
like I indicated earlier, slipping = heat. Low head speed, and high enough pitch to hover will not let the clutch fully engage and it will slip and get very hot very fast. Looking at the pictures it appears the clutch did not come in contact with the bell as you can still see the vertical machine marks on the inside of the bell.
Also one thing that seems odd is there does not seem to be any glue residue in the clutch bell, wonder how the liner was attached?

I think Raja is right send it in for repairs, there is too much damage for you to try and repair it yourself.
Spectra-G, MAH, CSM
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02-28-2010 05:57 PM  10 years ago
Sean Bosse

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Germantown, MD.

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Thanks for the input guys. I probably will just send it back to them. I'm just not sure I can afford it right now.

Sean
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02-28-2010 05:59 PM  10 years ago
Mike545

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gettysburg, pa

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we should start a fund, "the struggling college student gasser fund" ill help"always feel thankful..... never entitled"
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02-28-2010 06:13 PM  10 years ago
Sean Bosse

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Germantown, MD.

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Thanks for the kind words Mike! I think I will have to sell a few things to afford it. Anybody interested in either a Dx-7 air-version, or a Blade MSR? If so, pm me and I'll get some pics.

Sean
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02-28-2010 06:50 PM  10 years ago
Sean Bosse

rrApprentice

Germantown, MD.

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Listed the dx-7 for sale here: https://rc.runryder.com/t573837p1/

TX is sold!

Thanks,
Sean
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02-28-2010 07:16 PM  10 years ago
kogibankole

rrKey Veteran

albuquerque/ibadan

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check my galley and you will see my MA clutch burnt as well. No hot starts nothing.

It seems Raja has had enough success with his MA clutch, so in my opinion, it must be some some sort of user error.

Isnt it the same clutch system used on the status? Maybe the bearings are not able to handle the extra vibration of the larger engine?

I do like the rubber dampeners in the clutch and I wish my preddy had those, but it flies fine the way it is.
if im not blade bogging youll find me pack puffing
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