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04-18-2015 10:42 PM  4 years ago
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garyl

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Kmax
Here is a sneak peak at my next project.

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04-19-2015 12:11 AM  4 years ago
Mojave

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Super cool! I'm assuming that you're designing your own mechs also?
Barry
All helis and planes have an expiration date stamped on them...you only find it after you crash!!
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04-19-2015 12:33 AM  4 years ago
garyl

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Yes everything will be scratch built on this one. Looking to make it 700 size, there are many challenges ahead to do this due to the very narrow fuselage.
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04-19-2015 12:45 AM  4 years ago
Margaritaman

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There is a YouTube video of a helifest over in Europe that has one of those in it. Very cool for sure.Build, fly, sell, repeat
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04-19-2015 02:02 AM  4 years ago
Mojave

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Cool. I'm thinking 2 sandwiched bevel gears, driven by one bevel gear pinion in the middle?
Barry
All helis and planes have an expiration date stamped on them...you only find it after you crash!!
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04-20-2015 06:19 PM  4 years ago
garyl

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Barry, you will have to show me a sketch of that one, I don't think that will produce counter rotating shafts. The main shafts are at 25 degrees with very little room to work with. Keep the ideas coming

Some basic design criteria so far is as follows,
700mm blades
12mm main shafts 25 degrees opposed, counter rotating.
Non-ridged rotor heads, teetering type or very flexible blades. Can not have ridged rotor heads in a multi rotor helicopter.
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04-20-2015 06:47 PM  4 years ago
garyl

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Here is a three view with dimensions. If you scale everything to 1/8 there is really no room for proper designed mechanics. Then think of where that swash is going to go??? This will have to be a design the fuselage around the mechanics that will work approach.

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04-21-2015 02:23 AM  4 years ago
Mojave

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Hi Gary, the drawings are looking good. What I meant by sandwiched is you would have 2 bevel main gears that faced each other (gear face to gear face, canted at 12.5 degrees for a total of 25 degrees. The pinion would run in between them (sandwiched), so as the pinion turned each gear would rotate in the opposite direction. The gears would naturally spin in opposite directions. The gears would only overlap at the pinion interface. The only thing is that I'm not sure if they make a bevel gear with a 12.5 degree gear face (25 degree included angle).
Barry
All helis and planes have an expiration date stamped on them...you only find it after you crash!!
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04-22-2015 12:07 AM  4 years ago
burl

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04-22-2015 01:25 AM  4 years ago
Mojave

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Similar concept, but the gears would have to face each other (stacked) with the pinion horizontal to the gear face. I'd have to draw it out to show you. I just don't think the correct pitch gears are available.
Barry
All helis and planes have an expiration date stamped on them...you only find it after you crash!!
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04-22-2015 04:03 AM  4 years ago
Rafael23cc

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is it just me, or the animation on the link provided above show the outside gears rotating in the same direction?

i thought you needed the outside gears to rotate in different directions.

Rafael
Keep your feet on the ground, but your eyes on the sky.
Team Heliproz.com
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04-22-2015 06:12 PM  4 years ago
garyl

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You would be correct the animation is not correct for this application.
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04-22-2015 06:31 PM  4 years ago
coptercptn

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there is a guy in germany that has a turbine model built of this.. I contacted him about mechanics once and he replied ...but was having "personal" issues at the time. If I can find the info I will post it.

Watch at YouTube

Home of the "Sea Cobra".....
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04-22-2015 06:39 PM  4 years ago
garyl

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04-22-2015 07:44 PM  4 years ago
coptercptn

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yep, that's the guy.. He hadn't made it available when I first emailed with him...Home of the "Sea Cobra".....
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04-22-2015 09:34 PM  4 years ago
Mojave

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Yeah, the flettner mechs are cool. He drives his with one central pinion, but must have a reversed set of gears in one of the transmissions, because with that set up, both driven gears drive in the same direction. I'm guessing that one of his transmissions uses an idler gear to change the direction of rotation. (EDIT) With this set up, all you need to do is make sure that the tooth count of the drive gear and driven gear in both transmissions are identical (meaning that both drive gears have the same tooth count and both driven gears have the same tooth count) and you won't change the gear ratio of the transmission that utilizes the idler gear. So one of the transmissions would have a 2 gear set up, the other would have a 3 gear (idler). This allows the one transmission to rotate in the opposite direction. The gear timing of the rotor heads is critical, or you'll end up with a pile of parts... Also note that in this set up that I have pictured, the gear to the far left is the pinion, the center gear is the idler and the gear on the right is the driven gear. The center gear is not the pinion. Here's an example:
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!
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04-22-2015 11:18 PM  4 years ago
BeltFedBrowning

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Am I misunderstanding you? I can't figure out how a single stage idler gear contributes to gear ratio.
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04-23-2015 12:02 AM  4 years ago
Mojave

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I stand corrected, the idler gear does not change the overall gear ratio. The tooth count of the drive and driven gears is what determines the gear ratio. In this case the pinion and main gear. The idler gear is just along for the ride. My apologies, I was typing faster than I was thinking... I'll edit that last post.
Barry
All helis and planes have an expiration date stamped on them...you only find it after you crash!!
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04-23-2015 12:10 AM  4 years ago
BeltFedBrowning

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Thanks, you made my brain hurt
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04-23-2015 02:16 AM  4 years ago
Mojave

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LOL, glad to be of service... I feel ya, I have way too much on my brain at the moment too.
Barry
All helis and planes have an expiration date stamped on them...you only find it after you crash!!
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