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HomeAircraftHelicopterGasser Model RC HelicoptersOther › Spectra-G clutch question Pics added
03-14-2010 07:30 PM  8 years agoPost 61
pphil611

rrApprentice

South Dakota

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sean
I like your twin tank setup, pretty much like mine. I think I have 26 oz between the two, and get a good thirty minutes, with the small tank remaining 1/2 full.
Glad you noticed your clutch was getting warm with low head speed. Don't think you want to go through that mess again.

Spectra-G, MAH, CSM

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03-14-2010 07:34 PM  8 years agoPost 62
rbort

rrProfessor

Franklin, MA - USA

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Heat transfers
From the motor to the clutch system. Shouldn't be a problem if the clutch is warm. I think hot is an issue, warm is OK. I fly my Spectra at 1550 head speed (part of the flight but not most) and don't see any ill effects from it. I don't usually feel my clutch either, so I don't know what the temp is compared to a faster head speed.

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3280 flts
Whiplash V1-2 Hanson 300, 1555 flts
Whiplash V2 Hanson 300, 393 flts

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03-14-2010 07:42 PM  8 years agoPost 63
Sean Bosse

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Germantown, MD.

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Thank you for the help guys! I think I'll go out and get a infrared meter this week just to compare it with the venom smart temp.

Thanks for the complement pphil611, it may have been yours that I saw and copied.
Yeah, I don't want to have to deal with the clutch mess again. I noticed at the lower head-speeds it got too hot for me to comfortable with. I had felt it earlier at a higher head-speed and it was just barely warm. So I think I'm going to just stick with the higher setting.

Hey Raja, how's the podcast for the GV-1 set-up going?

Thanks guys,
Sean

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03-14-2010 07:52 PM  8 years agoPost 64
pphil611

rrApprentice

South Dakota

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Raja
I don't really agree with you on the clutch temp. Centrifugal force engages the clutch by causing the dogs to sling out. If there isn't
high enough rpm to create the required centrifugal force to get full engagement it will slip. I do agree that usually the heli will wobbel if the speed is too low, but not always.
I guess to each his own.

Spectra-G, MAH, CSM

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03-14-2010 08:06 PM  8 years agoPost 65
Sean Bosse

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Germantown, MD.

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Hey guys, I was just looking over everything and noticed that before I flew it I set up the clutch to correct specifications including having a spacing between the fan and driver of .020 inch using the supplied spacer. Now, after hovering, the spacing between the two seems to be half that, maybe .015-.010, enough that the spacer won't fit. Is this normal?

Thanks,
Sean

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03-14-2010 08:43 PM  8 years agoPost 66
rbort

rrProfessor

Franklin, MA - USA

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So Phil
At 1550 head speed, that like 11k rpms on the motor and you're saying the clutch is still slipping at that speed?

I understand if you run a really slow head speed the clutch will slip, but I would think that to be below 1500 rpms. Just out of curiosity, where do you think the rpm figure is on the engine where slipping stops?

Sean, on the gap its possible you didn't seat the clutch to the engine all the way down when you put it together. I usually take the spark plug out and pull it through several times while pushing down on the head after starting the pins in the rubber and it will auto seat down while you spin it. With every spin it will move lower and in about 4 to 5 pulls its down nice. Then bolt it together and pull it a few more times and check your gap then. Anyway the gap is fixed based on your motor crank height (how spread the crank is) and if its too tight you can add shims under the A frames to relieve it.

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3280 flts
Whiplash V1-2 Hanson 300, 1555 flts
Whiplash V2 Hanson 300, 393 flts

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03-14-2010 08:50 PM  8 years agoPost 67
pphil611

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South Dakota

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I don't remember anyone saying they were running 1550 head speed. I don't think anyone mentioned using a tack on the blades, I don't think we know what the head speed is now or was earlier.

Spectra-G, MAH, CSM

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03-14-2010 08:51 PM  8 years agoPost 68
carpman

rrVeteran

Spain

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Hey Sean just noticed you have a GY520 sat on there how does it fly on the gasser? There are some good deals on that gyro at the moment and it frees up a little room having one of those sat on there...

KEVIN
Trex 500ESP | Trex 600NSP | Trex 700 Gasser | MA Spectra G

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03-14-2010 08:54 PM  8 years agoPost 69
rbort

rrProfessor

Franklin, MA - USA

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Sorry my mistake Phil
I thought you were commenting on my post saying I was running 1550 with no ill effects. You're absolutely right maybe Sean is running it too slow causing the warm up. Mine actually when it was new prevented me from running it at 1500 as the heli wobbled and I had to pick it up to 1530 to get rid of the wobble. I just added another 20 rpms and set it there so I'm away from the borderline of wobble/no wobble.

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3280 flts
Whiplash V1-2 Hanson 300, 1555 flts
Whiplash V2 Hanson 300, 393 flts

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03-15-2010 01:46 AM  8 years agoPost 70
Carey Shurley

rrElite Veteran

Orlando, FL - USA

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Assuming the clutch was properly manufactured and gapped, it will continue to engage below a 1200RPM headspeed. It will engage well below any RPM that the model will like being flown at.

If you notice this clutch uses an aggressive engagement style, the shoes swing INTO the direction of rotation so it locks up pretty well at relatively low speeds.

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03-15-2010 03:24 AM  8 years agoPost 71
Sean Bosse

rrApprentice

Germantown, MD.

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Thanks for the input guys. I don't have a tach, so I don't know what head-speed I was running.

carpman, so far, i'm really happy with the GY520 on the gasser. Even with the motor really rich for break-in, it holds well. There is a very slight creep, but that I think will be go away once I begin to lean the motor out. Otherwise, it's rock solid. I highly recommend the combo.

Sean

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03-15-2010 10:50 PM  8 years agoPost 72
smallplanes

rrElite Veteran

S.C. ,SSA

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I'm not sure if this will hurt anything but the man at MA said there should be a gap of about .008 thou on each side of the shoe and the bell,which means a total of .016 difference in size. Well when in i got my 2nd new clutch system it had a total of .024 clearence of total gap and Ron at heli pros south said that was ok. So if mine fails again i hold them responsible for the 2nd bad clutch. I do not have but just a few flights on it and so far so good,and yes i used teo feeler gauges on both side the clutch to line it up both times. I think they are boring them out a little to much and that could be were the problem lies. Good luck to you and me. Just a tip from what i measured amd i do have pics of it.

Thanks
smallplanes


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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03-16-2010 12:14 AM  8 years agoPost 73
Sean Bosse

rrApprentice

Germantown, MD.

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Cool, thank you Ivan! As of right now, everything seems to be running well. I should know more by this weekend if when I have time to put a few more tanks through it.

Sean

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03-16-2010 02:51 PM  8 years agoPost 74
kogibankole

rrKey Veteran

albuquerque/ibadan

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isnt 270 a bit on the high side?

I have not been able to get the 3D max above 210 with Wally's fan.
Im running on the rich side though.

if im not blade bogging youll find me pack puffing

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03-16-2010 03:46 PM  8 years agoPost 75
carpman

rrVeteran

Spain

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I can't get mine below 265'ish, standard fan and shroud with 3D Max motor, but it was fine so I think my IR gun is reading on the high side...

KEVIN
Trex 500ESP | Trex 600NSP | Trex 700 Gasser | MA Spectra G

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03-16-2010 04:05 PM  8 years agoPost 76
kogibankole

rrKey Veteran

albuquerque/ibadan

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Yeah Wally's fan gets the air moving for sure!

Im running 3.5 oz of amsoil to 1 gallon of 87 octane, HS is currently around 1800 w/6.28 gear ratio.

Absolutely no vibration what so ever, and the engine is pulling hard! Im about to lean it a few clicks!

if im not blade bogging youll find me pack puffing

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03-16-2010 05:56 PM  8 years agoPost 77
carpman

rrVeteran

Spain

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Im about to lean it a few clicks!
Hey that's nitro talk Walbro carbs don't click

KEVIN
Trex 500ESP | Trex 600NSP | Trex 700 Gasser | MA Spectra G

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03-16-2010 06:49 PM  8 years agoPost 78
lejon

rrVeteran

Las Vegas, Nevada

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Clutch gap
Smallplanes, the difference you are talking about 4/10,000's is going to impact when the clutch engages. If all else is working well you will notice that the head will engage a little later on the one with more of a gap.

As you fly the gap will increase, but will do so slowly and you will probably not notice.

As long as you are not running the engine right at the engagement point you will not be able to notice the difference.

For someone who is performing very precise maneuvers and using the full range of RPM's they might notice it.

One thing I've noticed from the lower head speed and wider gap is that the clutch bell will warm up a bit. I've seen a 30 degree F increase, which is really not going to burn up your clutch. Continued use will increase the wear and the gap faster than normal.

Lejon

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03-16-2010 11:00 PM  8 years agoPost 79
Sean Bosse

rrApprentice

Germantown, MD.

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I haven't even done anything but hover and the engine is rich, yet I'm still consistently seeing temps of 270+.

Sean

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03-16-2010 11:19 PM  8 years agoPost 80
smallplanes

rrElite Veteran

S.C. ,SSA

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Sean my carb was driping fuel and i could not get mine under about 285-290 i changed carb blocks and i was down in the 240's just by changing the carb block. It must have been catching air i don't know but when i got it to quit leaking fuel it cooled down. You might want to check that.

Thanks


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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