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04-24-2015 12:00 AM  34 months agoPost 21
bwellmaker

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Long Island

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UIH,

That's some cool schit right there.

UIH,

B

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11-22-2017 04:25 PM  89 days agoPost 22
garyl

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taxachussetts

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I finally have a mechanics design that will fit into a 1/7 scale fuselage. I have sourced most of the gears from SDP-SI and will not cost huge money. The main gear is from a trex 700 with a 12mm one way center hub. The motor is a Scorpion 50 series 500KV. The ratio is 15.11:1 with the current gearing. The main shafts are 12mm and I still have to source rotor heads and blades, the blade sets will have to be opposite rotations.

Here is an AVI of the design so far.

Watch at YouTube

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11-22-2017 07:22 PM  89 days agoPost 23
Notar

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Or use symetrical blades.

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12-07-2017 02:34 PM  74 days agoPost 24
garyl

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I need some assistance from the community. I am looking for 800mm symmetrical narrow cord rotor blades. I did search google and only found one set so far. Align has some but the cord is wide.

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12-07-2017 04:38 PM  74 days agoPost 25
HilliHeli

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S.MI./FL.

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I believe that there are a few manufacturers that may carry 800mm Scaley main-blades here in the states (the other-rr members will know), I do know that the SpinBlades are popular overseas and I believe that Esprit Model can order or may even have them in-stock.

Scroll-down to see 800mm models ;
https://spinblades.com/navi.php?jtl...tierung=0&af=30

!Antriebe, die bewegen!
Henseleit-Helicopters.de
Jazz', Jives & vbar's
Futaba FASST / FASSTest

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12-07-2017 08:26 PM  74 days agoPost 26
oldfart

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Vancouver, Canada

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Gary, check with Leisure-Tech. They have 810 mm symmetrical narrow cord Rotor Tech blades.

Phil

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12-07-2017 09:35 PM  74 days agoPost 27
garyl

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Thanks old fart Rotor tech looks good.

Spin blades are semis and have a wide cord.

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12-07-2017 10:14 PM  74 days agoPost 28
HilliHeli

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S.MI./FL.

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My mistake on the Scaley Spin's, they do have symmetricals here though ;
https://spinblades.com/785-black-belt

!Antriebe, die bewegen!
Henseleit-Helicopters.de
Jazz', Jives & vbar's
Futaba FASST / FASSTest

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12-12-2017 04:14 AM  69 days agoPost 29
Joel Rosenzweig

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Marlborough, MA - USA

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Gary,

Will you consider fitting a clutch?

It was hard to see from the animation how the drive gear actually mates with the drive gears for each rotor shaft. It looks like the cluster of all three gears is meshed together. But since that can't be, I'm assuming that the drive gear is touching only one of those gears?

That's great that you found gears that work from Stock Drive.

I look forward to seeing your prototype mechanics in person.

Joel

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12-12-2017 11:45 AM  69 days agoPost 30
garyl

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Hi Joel,

Since everything has to fit in a very small space and obtain the correct gear ratio the gears are very close to each other. So to answer your question the lower of the three gear cluster is only touching one of the upper two gears. No plans for a clutch, there is enough rotating mass already. There is a one way bearing in the trex main gear. I will post a better avi of the animation when I get a chance.

I contacted SDP/SI for a quote on the gears but they are taking a long time to get back to me.

On another note does anyone know if you can drive spiral bevel gears in either direction??

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12-13-2017 02:58 AM  68 days agoPost 31
Mojave

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Palos Verdes, Ca. USA

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I believe that spiral bevel gears only perform well when they are run in the correct direction. They can be run for short periods of time in the opposite direction. Running them backwards can produce binding. It has to do with the angle of the gear cut, it wants to climb in one direction (correct) and wants to pull together when run in the opposite direction. Hence the rotational call out rt/lt gear sets.
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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02-11-2018 08:52 PM  8 days agoPost 32
garyl

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taxachussetts

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I found a real good deal on a Sherline CNC mill and lathe for making all the custom parts. Fusion 360 has great cam software with a post processor for Linux cnc which comes with the Sherline machines.

The first parts I made were bearing blocks cut from 6061 aluminum. The bearings fit perfectly on the first shot. Fusion 360 and the Sherline worked out great. The maximum chip load is 0.001" per tooth with 0.0005" finish cuts for this machine while still maintaining accuracy.

The gears also arrived but they are much heavier than I expected, 3.486 lbs. The engineer at HK gear told me the spiral bevel gears are bi-directional with the addition of thrust bearings.

I sourced the thrust bearings from McMaster Carr.

I acquired two Trex700 main rotor heads.

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02-19-2018 02:47 AM  20 hours agoPost 33
Joel Rosenzweig

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Marlborough, MA - USA

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When will you have the mechanics completed?

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