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04-24-2015 12:00 AM  36 months agoPost 21
bwellmaker

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UIH,

That's some cool schit right there.

UIH,

B

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11-22-2017 04:25 PM  5 months agoPost 22
garyl

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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  5 months agoPost 23
Notar

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Or use symetrical blades.

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12-07-2017 02:34 PM  4 months 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  4 months agoPost 25
HilliHeli

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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  4 months agoPost 26
oldfart

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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  4 months 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  4 months agoPost 28
HilliHeli

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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  4 months agoPost 29
Joel Rosenzweig

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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  4 months 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  4 months agoPost 31
Mojave

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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  70 days agoPost 32
garyl

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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  62 days agoPost 33
Joel Rosenzweig

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When will you have the mechanics completed?

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02-19-2018 11:55 PM  61 days agoPost 34
garyl

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Hopefully by June. I am still figuring out how the BD3SX tandem setup will work in the kmax. After that I will layout the servos and design frame spacers with bearings for the main shafts.

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02-20-2018 02:18 AM  61 days agoPost 35
Joel Rosenzweig

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You can install it as if it were a Chinook. But in your case, the aileron and elevator inputs to the 3SX will be swapped with each other so that an elevator command generates uniform swish tilt fore and aft, and aileron now generates DCP.

If you design your mechanics for 2 servo CCPM it’s a straight install.

If you need 3 servo ccpm you’ll have to convert 2 servo to 3 servo ccpm. I did that for my Hirobo CH-46 so I could keep the 3 servo CCPM. I can probably resurrect my source code for that if necessary to build you some hardware.

If you go 4 servo CCPM, then it’s easy to convert from 2 servo to 4 servo CCPM. You will need 4 servo reversers unless you get clever mechanically. In that situation, you would connect a Y cable to the output for each of the 4 servos, and a servo into one end of each Y, and a servo reverser plus servo into the other 4 ends. Done.

I built an integrated 4 servo reverser for my large Chinook. That’s working great too. The mechanics used 4 servo CCPM and I wanted to keep it that way.

Your best bet is to design it for 2 servo CCPM so you don’t need any other electronics.

Joel

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02-20-2018 12:31 PM  61 days agoPost 36
garyl

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Thanks for all that Joel. The problem with the Kmax is space, there is none. I will be going with the 2 servo setup which is very easy and does not take up much space. I found this video last week which helped a lot. I think he has his collective pitch reversed.

Watch at YouTube

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02-20-2018 11:02 PM  60 days agoPost 37
garyl

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I got all the controls to work correctly and below is what I had to do.

I have the servos laid out the same as in the video which is the tandem setup with just changing which way will be considered forward, 90 degrees off. The gyro is set up so the socket is forward and facing up.

In the 3sx gyro software RC tab I changed the aileron to channel 2 and elevator to channel 1 which is reversed for Futaba radios.

In the Mixer tab I had to put channels 3 and 4 to minus and aileron to minus in order to get everything moving in the correct directions. For the correct gyro corrections I had to set the socket mount to the right.

After all this it WORKS!!! Now I will lay it out in the CAD assembly.

Edit; I reversed the elevator channel in the radio and the gyro orientation can be set to upright this way.

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02-22-2018 01:47 AM  59 days agoPost 38
garyl

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Servo layout is in place and I think it will be good.

Now I have some swash work to do.

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02-22-2018 12:18 PM  59 days agoPost 39
bwellmaker

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Gary,

This is really cool. Fantastic work Mang,

B

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03-31-2018 04:08 PM  22 days agoPost 40
garyl

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I found the SAB Goblin swashes are a suitable start for what I want for this project. They have a 12mm main shaft ball, small over all diameter and can be disassembled for modifications.

This swash has a three point servo configuration and I need a four point. I designed a new lower four point swash ring to fit my needs and machined it on my mill.

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