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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Eureka!!! Linear servo motion!!!!!
03-11-2014 01:49 AM  6 years ago
buster1

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Manhattan, NY

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I am no expert or engineer, but if he went to the trouble of adding in this functionality - it must control the head in a more precise way, that increases the speed even further.

I'm sure he tested the heck out of it and he is getting Increased speeds and the three-bladed head probably needed it to control pitching up, etc.
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03-11-2014 01:54 AM  6 years ago
BobOD

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New York- USA

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Heli porn. That is all.
Sums it up right there.
Team POP Secret
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03-11-2014 01:58 AM  6 years ago
seefest

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South Dartmouth, Ma.

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My dad still has his linear Kraft and Citizenship servos from the 60's and 70's. He even had some in his Kavan Jet Ranger. Linear servos are not a new idea. Long throw linear servos make sense for a speed heli as they run 16-18 degrees of pitch. Perfect geometry for the full travel of pitch.
The added weight and complexity of this system on a 3D helicopter doesn't make as much sense.
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03-11-2014 02:01 AM  6 years ago
Retired2011

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Lee's Summit, MO

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Heli porn and popcorn!

It don't get no better than that...TRUST ME!!!
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03-11-2014 05:58 AM  6 years ago
icanfly

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ontario

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not an entirely new idea but you gotta admit they did it justice this time. 18degree pitch? That's be nuts for 3d. The mechanisms don't have to be all metal, weighty, and odd looking.

(I thought of the very config the guys at TDR have there, but that means nothing if a guy doesn't actually DO IT. I have some sketches. Behold the cp system of a planes pitch propeller system resembles your tail pitch slider and your main grip arms. Some are rack, pinion on the blade roots, pitch becomes less limited. Only thing diff is the swash plate. Ahh yes the lowly swash plate, dinner is served)

AHH HA!!!!
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03-11-2014 07:54 AM  6 years ago
Luvmyhelis

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Spokane, Washington. USA

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This is engineering genius at its best. I saw half a dozen engineering feats in its design other than just the linear servo layout. This thing should be a Ferrari in the air. And makes my Triabolo 800 look like an old ill handling Harley in comparison.

None of it is aimed at 3d. So I don't look at the heli from this perspective. This should knock the mighty Banshee down a notch, and I had someone offer me his a few days ago as he was trying to come up with the cash to buy one of these.

The mix of downright gorgeous carbonfibre, brilliant design work, and aluminum? This is the kind of grown up toy that makes a guy like me drool all over myself.
Old cranky heli builder
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03-11-2014 10:07 AM  6 years ago
hootowl

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Garnet Valley, Pa.

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I agree with jkos. This was often talked about over the years. Want to see it in action for years now? Look at your e-flight servos in the little helis and planes.Wolves don't lose sleep over the opinions of sheep
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03-11-2014 12:17 PM  6 years ago
Retired2011

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Lee's Summit, MO

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This is engineering genius at its best.
+1000
None of it is aimed at 3d. So I don't look at the heli from this perspective. This should knock the mighty Banshee down a notch,
Exactly!
Jan has been working on a dedicated speed machine for a couple of years...that is all it does!
Standard TDRs already knocked Banshees down a notch, in speed competitions.
The mix of downright gorgeous carbonfibre, brilliant design work, and aluminum? This is the kind of grown up toy that makes a guy like me drool all over myself.
Me too!!!
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03-11-2014 02:35 PM  6 years ago
JEEPWORLD2002/2

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Blue Bell, Pa

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100 % AGREE ^^^^^^^^^^^^^^Trex600n,Trex500,MR25,MikadoLoGo5003d/KDE,Goblin 380XNova,CastleCreations,Ys,JR XG8,Tags Mini XBus Dmss//FAA# FA3NYC9TAP
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03-11-2014 05:19 PM  6 years ago
Manny1776

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Melbourne, Florida. USA

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As always a piece of art!!!Fly High, Fly Fun, Fly Secure.........Fly 3D!!!! Bavarian Demon USA Team
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03-11-2014 08:33 PM  6 years ago
HeimD

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the great southwest

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In order for rack and pinion to work, you have to have special s/w in the FBL.
No, you don't. Instead of swinging a servo arm, all the servo output shaft does is rotate back and forth (same as always) and spins a gear (pinion) that moves the rack and attached link to the swash up and down. No special firmware of any kind required.
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03-11-2014 08:37 PM  6 years ago
JKos

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Redondo Beach, CA

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HeimD,
He is referring to the fact that current FBL software takes into account the standard servo configuration that results in nonlinear pushrod deflection per angular deflection of the servo. In other words, the current software linearizes the pushrod motion.

Thus, if you now use a linear servo, the FBL unit needs to know not to do that extra math.

- John
RR rules!
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03-11-2014 08:47 PM  6 years ago
HeimD

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the great southwest

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Or, you just cancel it out with EXPO in the TX. Again, no special firmware needed.
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03-11-2014 08:51 PM  6 years ago
icanfly

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ontario

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Thus, if you now use a linear servo, the FBL unit needs to know not to do that extra math.
solved with negative expo.
I thank the guys for posting, it has helped to solve another question which arose from delving into this rack/pinion configuration, see cp airplane props. There's still yet another way to achieve linearity from a servo. Rack and pinion is 90 percent efficient though.
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03-11-2014 09:20 PM  6 years ago
HeimD

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the great southwest

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solved with negative expo.
Bingo.
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03-11-2014 09:24 PM  6 years ago
JKos

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Redondo Beach, CA

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But not in the transmitter, HeimD. We are talking about the FBL unit which is doing the swash servo calculations, not the transmitter.

- John
RR rules!
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03-11-2014 09:54 PM  6 years ago
HeimD

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the great southwest

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Yes, let's disregard the TX because it isn't part of the whole flying equation now, is it? Are you going to re-program/fly a FBL unit without a TX? Don't think so...
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03-11-2014 10:30 PM  6 years ago
whoamis

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san francisco, ca

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HeimD: when flying straight and level in the wind, the FBL makes corrections without the sticks moving. There are other moves where the sticks are still in at least one dimension and the FBL makes corrections.

If the expo matters to the FBL, putting it in the radio won't help in these use cases.
oops, bounced it!
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03-11-2014 11:37 PM  6 years ago
BobOD

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New York- USA

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I can see it coming now. A whole bunch of threads titled:

"Where do I get the v5.3 linear firmware?"
"I tried to download but it says I'm not registered. "
"I loaded the latest linear software and now it doesn't connect."
"What do you mean I have to pay again for 5.3 pro-linear?! "

Team POP Secret
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03-11-2014 11:52 PM  6 years ago
Al Austria

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Sacramento, CA - USA

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In other words, the current software linearizes the pushrod motion.
Depends on the flight control system. Certain systems may grant users the ability to input known servo positions into a lookup table that may(or may not) assist the control loop.

Ultimately, the only thing that any well optimized flight control system cares about is that the error between its desired(commanded) attitude, and the vehicle's actual attitude as derived from a calculated sum of sensor data is kept to a minimum. FBL systems will compensate, to a point, for geometric shortcomings in a mechanical setup.

IMHO, the added complexity and weight of this setup, at the very least, LOOK cool...
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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Eureka!!! Linear servo motion!!!!!
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