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HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › Missing teeth on top of main gear? Fly or not???
02-08-2008 12:26 AM  10 years agoPost 21
Gearhead

rrMaster

Vt

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well I wasn't going to get into this because I wouldn't tell anyone TO fly with a tooth missing, but yes I have flow with tooth/teeth missing, then I went and saw a dentist after the plane landed, HeeHee HaaHaa,,

yes a couple times I have flown my Falcon with a couple teeth missing on the crown gear (no joke there),, once the guy I fly with said I better keep your heli on the bench, I told him "why, this is a Century heli" he just smiled, later he was surprised to see it didn't make much of a diff, then I lost a 3rd tooth and that was when it's tail started kicking,,

if you find,,
if you find you have a lot of back-lash in the 2 gears you can find a thin washer or shim and put it behind the Tapered Pinion Gear to tighten up the lash, if you do this I doubt you will ever have a problem loosing a tooth on a good main gear,,, the washer I used was thin, it was .020" (about 1/2mm),, most the washers I measured were .040" (about 1mm)

Jim Bob, Yee Heli Flyer

Jim
Buzz Buzz Buzz

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02-08-2008 01:37 AM  10 years agoPost 22
Blade_Master1

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Canada

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"if you find you have a lot of back-lash in the 2 gears you can find a thin washer or shim and put it behind the Tapered Pinion Gear to tighten up the lash, if you do this I doubt you will ever have a problem loosing a tooth on a good main gear,,, the washer I used was thin, it was .020" (about 1/2mm),, most the washers I measured were .040" (about 1mm)"

Thanks for the tip I was wondering how to do that.

.

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02-08-2008 02:35 AM  10 years agoPost 23
Dilbeck

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Springdale Arkansas

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And so it goes on, Here Here to all!!

Clint

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02-08-2008 04:11 PM  10 years agoPost 24
jester4

rrKey Veteran

Brampton, Ontario

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Great tip wasp.

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02-08-2008 05:48 PM  10 years agoPost 25
AceBird

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Utica, NY USA

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Acebird, its not like we are talking about flying with a nut gone on the main blades, or a paddle that wont tighten up.
Where do you draw the line? Can you predict what a newbie is thinking when he sees a more experienced pilot ignoring a problem?

You don't know what the straw is that finally breaks the camel's back. We shot space shuttles up in orbit without a hitch for 20 years and then something happened. Failure can be very hard to predict unless you take chances. Then it becomes easier.

Ace
What could be more fun?

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02-08-2008 08:52 PM  10 years agoPost 26
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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my old Nexus was bad for ripping teeth off.

one thing that happened, was that as soon as even one tooth was missing, the pinion would not line up correctly with the approaching tooth, and would therefore jam and slam into it. it would then shear off another tooth. and before you know it, within 1 minute of flying, your down to just a few teeth.

now...last summer i had a slight tail strike on my predator from a crappy auto. the blades didn't even break, but a couple teeth were sheared off. i didn't notice it after the strike, so i flew another tank in it. it wasn't long before i could hear that old clicking sound i knew too well from the nexus. after landing i found that several more teeth had been ground off.

so in short...yes, you can fly it, but for how long is another question.

its much cheaper to replace a gear then a heli.

Shawn
Team Leisure-Tech
Team HelixRC

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02-08-2008 09:03 PM  10 years agoPost 27
jackheli

rrProfessor

Vancouver - Canada

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i didn't notice it after the strike
In order to be able to spot missing teeth I dye white gears with Black Rite so a white mark will come up over black if a tooth is lost.

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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02-08-2008 10:16 PM  10 years agoPost 28
Blade_Master1

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Canada

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Here is a video of buddy who flew most of the day with half the crown gear gone.

Watch at YouTube

now whats so bad about that ??

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02-08-2008 11:13 PM  10 years agoPost 29
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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Jack, thats a nice idea. i just turn the gears while running my finger over the crown to feel for a gap (missing tooth).

blade master, your buddy wasn't doing much more then climb outs and hovers. if you were to really work the tail, your crown gear will go up in smoke. and i dont think even at his flying style that it would have even lasted more then a few flights.

Shawn
Team Leisure-Tech
Team HelixRC

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02-09-2008 12:20 AM  10 years agoPost 30
Blade_Master1

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Canada

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Well I did say earlier in this post that I would change it before doing any hard 3D. ^

The missing teeth is probably why he was doing auto's most of the day
And He did get to enjoy his heli for the rest of the day

Don't get me wrong even though the crown gear is no big deal.
I would not fly if anything else was broken.

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02-09-2008 12:26 AM  10 years agoPost 31
AceBird

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Utica, NY USA

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now whats so bad about that ??
I don't understand what you are driving at. If the heli is so durable and safe why do the teeth break in the first place? Shows a sign of weakness to me unless it is a result of a crash. Please don't tell me you fly right after a crash.

Ace
What could be more fun?

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02-09-2008 12:34 AM  10 years agoPost 32
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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something has to break doesnt it?

i have done full stick left and right piro's slamming the stick back and forth trying to break my crown gear in flight. just to see for myself if i can even trust it. even though you could hear it screem for mercy, it never broke a single tooth.

but when the tail contacts the ground, you cant expect nothing to happen.

Shawn
Team Leisure-Tech
Team HelixRC

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02-09-2008 12:54 AM  10 years agoPost 33
Blade_Master1

rrElite Veteran

Canada

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Quote "I don't understand what you are driving at. If the heli is so durable and safe why do the teeth break in the first place?"

easy to replace inexpensive crown gear VS expensive torque tube

Love the way it's designed

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HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › Missing teeth on top of main gear? Fly or not???
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