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HomeAircraftHelicopterFuel-Helicopters New or Limited ActivityAirstar › Main gear is rubbing frame on my Mongoose!
03-11-2012 03:37 PM  6 years agoPost 1
OneHoof

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Cold Spring, Kentucky

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Ever since I got my Mongoose I have been trying to fix tail wag issue. It seemed to be caused by engine sputter so I changed fuel clunk with small nitro one and took K & N air filter off. I also replaced all of the fuel line.

I figured constant and small tail shake was caused from engine sputter and or vibration. But engine is B. H. Hanson modified so engine is smooth. I put Geal tape under Gy611 gyro to replace thin tape to dampen vibrations.

But none of this helped. During last nights test flight I removed the clunk to ensure it was getting plenty of fuel. The vibration was so bad the gas was shaking and foaming.

When I got home I examined the helicopter closely and discovered that the main gear is rubbing the frame and this is probably the source of all of my problems.

I removed rotorhead/main shaft and gear, but I don't know how to increase the spacing so my gear has some clearance? I need some help with this one. How do I fix this problem?

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03-11-2012 05:58 PM  6 years agoPost 2
clever Heli

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So Cal, CA - USA

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The main gear runs really close to the frame and looks like it's rubbing. If you turn the gear by hand and hear it rubbing then it's possible that you just need to adjust the top block. The top block will allow you to move forward or backwards slightly. If it's rubbing both front and back of the frame then you will need to shim up the gear. There is a brass washer under the gear that can be shimmed or get a slightly taller one. ASI should be able to make you one.

I would be willing to bet that it's your engine. Just because it's a Hansen doesn't mean you won't get engine sputter. I would try increasing the head speed a little and/or adjusting the needles on the carb. You need to find the sweet spot on these engines.

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03-11-2012 06:16 PM  6 years agoPost 3
jtv62161

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Oakdale Pa / Quaker city Ohio / Bradenton FL

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clearence
after reading your post I went down and looked at mine and on the gas cap side of the heli I wasnt able to pass a post-it piece of paper between the main gear and the frame, although on the other side I was able to slide the paper through barely, its as the main gear is almost resting on the servo plate and the frame. I guess if this becomes a problem I could lightly file or dremel a extra 1/32 of clearence, or maybe carefully belt sanding 1/32 off the bottom side of the main gear giving a little more clearence. As this is a new heli for me It was test flown at airstar with no problems, but yes now that I looked it is dangerously close! Im curious what others are like??

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03-11-2012 06:19 PM  6 years agoPost 4
jtv62161

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Oakdale Pa / Quaker city Ohio / Bradenton FL

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clearence
I would rather shim than grind as stated in previous post if possible anyday!!!

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03-11-2012 06:35 PM  6 years agoPost 5
OneHoof

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Cold Spring, Kentucky

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It is definitely rubbing because there are black marks on both the front and back of the frame and you can see wear marks on the bottom of the gear.

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03-11-2012 09:00 PM  6 years agoPost 6
clever Heli

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So Cal, CA - USA

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Okay, If it's rubbing both front and back areas of the frame then you will need to shim or get a taller brass bushing/washer. If it's rubbing on just the back or front of the frame then you should be able to adjust with the top block. The screw holes are oval in the side frames to allow adjustment of the block (take one of the screws out of the block and you will see what I'm talking about) . I've been flying mine for 6-7 years and never had that bushing/washer wear down. Don't forget to locktite everything back up.

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03-12-2012 01:23 AM  6 years agoPost 7
Scorpion

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Socal USA

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add a 12mm washer under the main gear
my was doing the same thing for a long time, so i took it a part and went to Ace hardware and got me a 12mm washer for under the main gear and that solve my issue.

try that and see how it works for you

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03-12-2012 01:28 AM  6 years agoPost 8
Scorpion

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Socal USA

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Wolf scale heli
Hey Clever Heli, any up date on your scale project? I seen the pics on your galery and I was wondering if you have any up dates on the finish good?

it is looking great so far.

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03-12-2012 04:36 PM  6 years agoPost 9
Angle-of-attack

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So Cal

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Airstar Mongoose
Hey Clever Heli..you should work for airstar ? ?

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03-12-2012 06:24 PM  6 years agoPost 10
clever Heli

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So Cal, CA - USA

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Hey Clever Heli, any up date on your scale project? I seen the pics on your galery and I was wondering if you have any up dates on the finish good?
No it's been on the self collecting dust. Don't know if i'll ever finish it. I offered it for sale at one point. Maybe someday...

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03-13-2012 01:00 AM  6 years agoPost 11
Scorpion

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Socal USA

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Anybody here with a Mongoose and a Airtronics Radio?
is anyone flying the mongoose with an airtronics RDS8000 radio? I would like to see what the throttle & pitch curves are out there with this radio

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03-13-2012 04:09 AM  6 years agoPost 12
kevin39307

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meridian,mississippi

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im flying my mongoose with the airtronics sd-10g.

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03-13-2012 06:36 AM  6 years agoPost 13
Scorpion

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Socal USA

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External tanks
thanks Kevin, people don't really like the Airtronics radios out here on the flying fields; what are your normal throttle and pitch settings

I also see that your goose has these ex tanks, which one drain first,the black ones or the clear one.

I heard that this setting don't really work because the fuel pump on the carb. is not strong enough.

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03-13-2012 02:10 PM  6 years agoPost 14
kevin39307

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meridian,mississippi

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i recently sold the tanks because i wasnt using them,but they wrked very well. the down side is that they drane from the white tank first and the external tanks last. as for the airtronics radio, i love mine because its very user friendly and it has all the bell and whistles like the futaba etc. what do you have your settings at now???

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03-13-2012 02:51 PM  6 years agoPost 15
BeltFedBrowning

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Kansas City

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Here is my fix for the industrial main gear rubbing. I just made an extra spacer.

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03-13-2012 08:46 PM  6 years agoPost 16
RajSingh

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Fresno, ca usa

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Yep
he made one for me too.
Raj

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03-14-2012 04:23 AM  6 years agoPost 17
OneHoof

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Cold Spring, Kentucky

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Shane at Airstar mailed out a spacer washer for me yesterday.

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03-21-2012 08:16 PM  6 years agoPost 18
OneHoof

rrApprentice

Cold Spring, Kentucky

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The new washer came over the weekend. I installed it on Monday.

But now the main gear meshes with pinion kind of high instead of dead center like before. I guess this is okay?

The bigger problem now is the pin that holds the pinion to the shaft is hitting the top of the main gear now.

I was told to take the pin out and cut it shorter so it doesn't rub.

But was incorrectly told nothing holds the pin in the pinion and shaft.

So I tried to tap it out and pull it out to no avail.

In the process I smashed one of the pinion gears with chisel when it slipped off pin.

Then the pinion damaged plastic main gear.

So now I have to replace main gear and pinion now.

Some days you can't win.

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03-21-2012 08:19 PM  6 years agoPost 19
OneHoof

rrApprentice

Cold Spring, Kentucky

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Shane told me new pinion no longer has a pin, but just a set screw.

He said I will have to dremel a flat spot on the shaft to secure the set screw.

I'll get my friend to help me so I don't mess that up too.

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