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HomeAircraftHelicopterSynergy R/COther › Metal tail gears
01-11-2010 05:00 PM  8 years agoPost 1
Paul Woodcock

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Dubai - United Arab Emirates

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Hi guys

Nearly crashed my Synergy today. Tail gears stripped while doing a big climb out.

Violent piro....to follow.

I hit the auto switch and let it fall, while the piro rate slowed down and i managed to pull off the rest of the auto back onto the runway.... very lucky.

The gears are only about 20 or 30 flights old. They were replaced after the last ones stripped..... not as lucky that time. Small crash.

I think it is time for metal tail gears, but no one has stock.....

Any ideas?????

Regards
Paul

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01-11-2010 05:14 PM  8 years agoPost 2
cdrking

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Seattle

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Paul,

Nice save. Did the tail gears have ANY backlash in them? If so they will not hold up well at all. Also if the tail blades have nicked the ground they may have been compromised a bit. What I have also found is that after a new set of tail gears are flown a bit they need a little re-shimming.
Also I assume you are running some delay in the gyro, this will help dampen the tail.

So far I haven't stripped any tail gears in-flight but I don't tend to be really radical on the tail, by that I mean hard reversing piros.

Bart B on here runs the metal tail gears. You may want to PM him and get his input. I have always run the plastic gears and have had very good luck with them.

If you put the metal tail gears in post your opinions, I've been thinking about trying them.

Cheers,

Jeff

To hover is divine, the alternative is rather PLANE.

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01-11-2010 05:14 PM  8 years agoPost 3
thenewguy

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Corvallis, Oregon Where there is liquid sunshine!

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I have been running the stock plastic gear every since Synergy hit the market. I have only had one set of tail gears strip. This was because the mesh had some slop in it.

I check my mesh before and after every flight. As long as it's set properly I have never had a issue. I also make sure that the whole TT system has no slop it is also.

I'm not saying don't get the metal tail gears.

Just food for thought.

Chris

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01-11-2010 05:30 PM  8 years agoPost 4
Paul Woodcock

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Dubai - United Arab Emirates

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Hi guys

I have been testing the new Spartan Quark for the last 20 to 30 flights. Almost all the flights since the last crash have been with the Quark. The Quark is MUCH slower in the stops and starts than the Spartan 760. I was NOT being too abusive on the tail today. I have to admit, i have not looked at the gears in the last 10 flights or so.... and not checked the backlash properly since installation. Rap on knuckles for me.....

Today i had made a new 'hard' mount for the gyro up front. I took the rear gyro mount and drilled 2 holes in the frames and mounted it up front. I had found the std front gyro mount not very good as it wobble a bit.

I was going to test the heli and if satisfied, go home and start the strip down necessary for my flybarless project...... so i am really pissed...... at the delay!!!!

I would like to try metal gears, but may just get some plastic ones as they are available locally and get some metal ones later.

I have been doing some research here on RR and i liked what one of the guys was doing. He used only one metal gear. The forward most of the 2 tail gears. The rear one is easier to inspect and easier to replace. This makes a lot of sense. I am not sure 2 metal gears is a good idea.... something needs to break. A plastic gear is OK....

Thanks guys

Regards
Paul

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01-11-2010 06:42 PM  8 years agoPost 5
Entityofme1

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Birmingham, AL.

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I've stripped 3 sets of the plastic gears and had always been careful to try and minimize slop in the mesh. I think it comes down to a number of variables including installation, flying style, and gyro settings. I went through a phase where I did lots of stupid reversal piros on moves like tail slides and the plastic gears just didn't have the ability to withstand the stress. I've since switched to the metal gears and have been flying them now for about 6 months. They are a fantastic upgrade and cost nearly the same as the plastic bevel gears. I had a real nasty crash once due to the plastic gears stripping and that was all it took for me to say goodbye to them. The metal gears are literally bullet proof. If you mesh them correctly and put some grease on them from time to time they will last a very long time. It's a bit of trial and error to set the mesh with the metal gears. I've owned three sets of them. The first set lasted about 20 gallons, the second set lasted about 15 gallons, and now this third set has lasted and faired much better than the previous two sets of which the coating is still intact as well. Use a grease called Motul tech 300 and it will stick to the gears offering great protection and longevity. You can find the grease from some motorcyle parts suppliers.

This third set was meshed a bit more loosely than the prvious two sets and this combined with the grease has made them well worth the money for as long as they have lasted. You won't be dissappointed with them and you can be hard on the tail with hard stops and reversals. As far as your concern goes with the gears breaking something else by not giving I can add that I've crashed my N9 really nice and hard with them and nothing out of the ordianary seemed to occur. The crown gear is always more than likely going to strip on the N9 which is what happened on mine but the main gear seems to always come out unscathed. Glad that you got yours down safely.

I learned alot about saving helis during the period of time when I didn't know how to mesh the crown gear correctly and when I had the plastic tail gears. I probably stripped 3-4 crown gears and had to auto in a fair share of those. Some ended in crashes and some were trully fantastic saves. You can actually stop a wild out of control piro by bleeding down the head speed a bit. Once the piro has stopped you can actually build some head speed and keep the same heading to auto safely in. This all depends on your altitude of course and the orientation providing the pilot can stay calm and has enough time to execute all of it.

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01-11-2010 06:51 PM  8 years agoPost 6
thenewguy

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Corvallis, Oregon Where there is liquid sunshine!

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Edit to my post above. My flying style does not include a lot of hard piro reversals. So this could be one reason I have not had issues. I think Entityofme1 write up is very informative about the gears.

Chris

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01-12-2010 10:53 AM  8 years agoPost 7
Paul Woodcock

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Dubai - United Arab Emirates

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Hi guys

I am sold..... but where do i get some.

Everyone seems to be out of stock.

Regards
Paul

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01-12-2010 08:22 PM  8 years agoPost 8
Kevin Dalrymple

rrKey Veteran

Indianapolis

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Call or email jim at Hyperformance. Ronz had them and not sure if they still do.

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01-13-2010 04:19 AM  8 years agoPost 9
Paul Woodcock

rrElite Veteran

Dubai - United Arab Emirates

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Hi Rymps

Will do, thanks

Regards
Paul

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01-14-2010 07:08 PM  8 years agoPost 10
Paul Woodcock

rrElite Veteran

Dubai - United Arab Emirates

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Hi guys

I emailed Hyperperformance and have got no answer..... i guess i may have to wait a few more days, i am sure they are busy.

Regards
Paul

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01-14-2010 11:25 PM  8 years agoPost 11
Helico-pteron

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Glenview, Illinois

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