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11-07-2004 11:18 PM  13 years agoPost 1
turboomni

rrProfessor

East of the Equator

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I put in the Bevel Gears and noticed the shaft had a slight warp in it but not nearly as bad as the original that shook my heli apart practically.
But it wasn't as arrow shaft straight as the replacement non bevel gears
shaft I had been using until I landed abit hard and wiped out the output shaft gear[plastic] other gear on the shaft is brass.
Anyway ran the heli up and it seemed fine but I noticed shorter run times. I also thought my 400DH was abit lower on power. I felt the motor and it was alittle warmer than usual which is only slightly warm. Picked up the heli over my head and ran it up. It felt like a fricken Vibrator! Gear mesh is correct.
Is there an upgrade to steel or something or someone made one from a bicycle spoke. I'm sick of this problem as it's the 2nd defective input shaft I've gotten from the factory.

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11-08-2004 01:18 AM  13 years agoPost 2
DaBman

rrApprentice

San Diego, Ca.

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Although I haven't tried these products, there is a steel tail drive shaft available from helihobby and other sources I suppose. also I have heard CA ing the gears onto a bicylcle spoke. I have the beveled gears and just love them, it;s a whole new tail, very tight and responsive and much quieter too! Good Luck!

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11-08-2004 01:35 AM  13 years agoPost 3
turboomni

rrProfessor

East of the Equator

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I was believe it or not very happy with the non bevel gears because it was smooth and worked along time/no grass etc.
I'm sure a STRAIGHT shaft with the bevel gear would work even better. It's just that you can't always be sure the shaft is real straight when you mail order is all and because it's happened to me twice pisses me off.

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11-08-2004 01:48 AM  13 years agoPost 4
MicroHeli.com

rrApprentice

PIS

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turboomni

and make sure you got the shaft with diameter of 1.97-1.98mm to be able to slide into the bearings of tail gear case and tail pitch slider. It will take you hours of grinding from 2.00mm high speed stainless steel shaft to the shaft that can be able to slide into the bearings! Those shafts that are perfectly straight are CNC machined. If you can get a titatium shaft it will be perfect!

I got two bevel gears and I noticed that they are not perfectly meshed. The gears on the small gear should be made a little bit smaller to have a good mesh with the output gear. I am also afraid the CA glue will not keep the little ouput gear from sliding around the round shaft HS stainless steel shafts under 20,000 RPM. I want to put my 2.5mm diameter shaft collar on them with a set screw but I don't want to bring more weights to my tail.

Andy Le

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11-08-2004 02:29 AM  13 years agoPost 5
iskoos

rrKey Veteran

Orlando, FL

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Thanks for the feedbacks. I was thinking to upgrade my stock tail to bevel gear. Actually, I almost did it over the weekend. I was about to buy it but since I already had the extra stock tail drive shaft and plastic output shaft, I decided to wait till I use them.
Now, per your comments, I see that the bevel gear upgrade is not a miracle. I will keep flying with my stock tail. And let me tell you this it never failed or did anything weird on me. I spent two tail output gears so far and two of them was my fault. I hit the tail.
If you don't hit the tail, the stock gear will last long enough I believe.

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11-08-2004 05:37 AM  13 years agoPost 6
turboomni

rrProfessor

East of the Equator

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Autoptsy of bevel gears
I pulled the tail off and main blades are ran it up. No bad vibrations. Alittle vib at run up that went away at high rpms. Added the tail gear housing without the yoke,,just the output shaft. some buzzing that went away at higher rpms. added yoke without blades[rear] abit more vibs .thruout the rpm range .added rear BLADES,,, ALOT more vibs.,,Shaking the rear ALOT. AHAA!!! Bad blades!! Changed that ,,same thing. I finally check closely the gears. The BEVEL Gear on the Tail SHAFT[powers the rear rotor blades] HAS SOME RUNOUT THAT IS VISIBLE TO THE EYE. Very slight mind you but there. It's a slight wobble of the gear in relation to the shaft [which seemed straight]. I spun it on my dremel tool. At high rpms not visible but at llow rpm's was visible. I'ts not the drive shaft But the output gear that has a wobble. But I would like the drive shaft straight also as it does buzz at a harmonic rpm and goes away at a higher rpm. It does have a slight bend too. How does the factory expect things spinning this fast to be inlign and perfect balance with their present manufacturing technics of the tail.? The quality control is this area sucks as this is the second crappy rear end from the factory I have recieved.

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11-08-2004 06:29 PM  13 years agoPost 7
CRAZYKEV

rrVeteran

Cincinnati,Oh - U.S.A.

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I am still running my Microheli blue gears and have no complaints, but I am going to try a set of the Microheli blue bevel gears and put the crown gear set on my second Shogun I am working on building.

I am sure you won't have the run out problems with the blue bevel gears! You can even get them with the metal torque drive shaft and blue gear installed from what I have read on the Microheli website.
( can you confirm that Andy? )

I will give some updates once I have tried the blue bevel gears.

Later,
Kev

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11-08-2004 07:47 PM  13 years agoPost 8
MicroHeli.com

rrApprentice

PIS

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Kevin,

I am going to improve it by installing a collar shaft with set screws (well, let's see...!) but it can solve the problem of sliding. With that, we are sure to have a good gear.

Let's see what it comes with the test!

Andy Le

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