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HomeRC & Power✈️Aircraft🚁HelicopterFlybarless Rotor Head SystemsSkookum › Skookum SK-720 Flybarless System
03-31-2010 03:51 PM  10 years ago
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blade3d

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New Jersey USA

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Skookum SK-720 Flybarless System
http://www.helidirect.com/skookum-s...tem-p-18576.hdx

Check it out Looking good
Blade3d
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04-02-2010 12:36 AM  10 years ago
keep-it-cool

rrApprentice

socal

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own 2 great unit and still in beta... IMHO it is now the new standard!
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04-02-2010 12:51 AM  10 years ago
Ronald Thomas

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Gainesville, Fl, USA

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If you fly larger helis, the SK-720 includes a heavy-duty external power bus
More to wire in? Almost all the others do it internally
Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!
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04-02-2010 12:57 AM  10 years ago
keep-it-cool

rrApprentice

socal

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Yes if you want or need a 20a bus.... No other unit does that!

Here is some talk over on HF about how the bus can also help with vibs...

It also goes into detail on how you dont need all the wires you think you do.

>So, we have 6 cables coming to the vibration sensitive unit in case of PowerLine
or 8(!) without PowerLine
>So, I don't see any advantage of the PowerLine in terms of vibration reducing.

1) All but one of the cables to the power bus only need to connect the signal pins. So the total number of jumpers is 4, to send 9 signals (or 3 for 7 signals). If you use an external receiver, only 3 jumpers are used.

2) The cables connecting the receiver and power bus can be light, 24-26 gauge or lighter, not the normal heavy 22 gauge . Also, the wires for the satellites are very light, around 28 gauge.

3) Note the stiffness of a rod goes by the third power of thickness - so 1/2 as thick means 1/8 as stiff. In this case, it works out to about 1/3 as stiff for 24 gauge vs 22 gauge. For spektrum wires, it's more like 1/4 as stiff.

So a 500 size or smaller heli has 5 light-gauge servo wires + 2 lighter spektrums or 3 light receiver jumpers. Normal score here is 5 + 2 * 0.75 = 6.5. (Space is short on these helis, and the wires aren't an issue as long as they're not over-strapped)

For larger helis: Using the power bus to serve 7 channels, the unit sees 3 light jumpers, + 2 spektrum or 3 light receiver jumpers. Without the power bus, the unit would see 5-6 heavy servo wires + 2-3 receiver wires, plus 1 power. So normal score here is 4.5 if you use the power bus, vs 7x3 + 1.5 = 22.5 if you skipped it.
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04-02-2010 10:04 PM  10 years ago
Bruce2.5D

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Vancouver, Canada

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>More to wire in? Almost all the others do it internally

Yes, almost all the others are under-designed for anything over a 500-size electric.

Servo connectors are only meant to handle 3 amps each. A set of four 8717 servos will often be pulling 12 amps.

And from a vibration point of view, you can't have six heavy cables connected to a sensor unit; so either the power bus has to be separate, or the sensors themselves.
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04-02-2010 10:11 PM  10 years ago
Ronald Thomas

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Servo connectors are only meant to handle 3 amps each. A set of four 8717 servos will often be pulling 12 amps.
Yeah I know what you mean

My point is another power bus for up to 20 amps is pretty big and bulky which defeats the purcpose if the self contained unit. If you need a power bus for a servo system that needs 20 amps then you may want to rethink your setup

I hope this system does well.....only time will tell. I need more unbiased opinions on it before I try it..............Ron
Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!
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04-02-2010 10:21 PM  10 years ago
keep-it-cool

rrApprentice

socal

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I hope this system does well.....only time will tell. I need more unbiased opinions on it before I try it..............Ron
I dont know what you mean by unbiased, I would think 95% of pub testers paid for theirs, I know I did. I even asked for a 2nd when I found out how well it works!

Also the power bus is there only for large setups and if its required by your setup.

I think some cant keep from thinking that their v-bar is now out-dated
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04-02-2010 10:22 PM  10 years ago
Ben-T-Spindle

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Central Illinois

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Any flight reports?

... BTS
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04-02-2010 10:23 PM  10 years ago
Ronald Thomas

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Gainesville, Fl, USA

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Maybe I should have highlighted a word there:
I need more unbiased opinions on it before I try it..............Ron
Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!
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04-02-2010 10:28 PM  10 years ago
Bruce2.5D

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Vancouver, Canada

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laughingstill: Yes but vbar recommends against using the mini-v for helis over 500 size...say isn't that a Logo 600?
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04-02-2010 11:03 PM  10 years ago
Riq

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ND

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Wow, I like the self leveling feature. Ill prob sell my gyro, head and ap2000i/fma setup and go with this fbl solution on my AP ship.

Id like to see how effective it is.
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04-02-2010 11:58 PM  10 years ago
Eco8gator

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Palm Beach, FL

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A bus capable of 5x 3A and an short inrush burst at 20A is good design practice. BUT the on board bus is probably already made to handle this.

If any advantage comes from this EXTERNAL bus is the potentially reduced vibration going to box containing the sensors. I do agree with this especially if you plan on using the Accels (sensors that give you an absolute position reference for self leveling) to self level a nitro machine.

I wish them luck with their new design.

C
Xera Motors
ProBar
Minicopter
Thunder Power
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04-03-2010 12:20 AM  10 years ago
Ronald Thomas

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laughingstill: Yes but vbar recommends against using the mini-v for helis over 500 size...say isn't that a Logo 600?
500 without issue might I add
Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!
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04-03-2010 01:31 AM  10 years ago
Bruce2.5D

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I stand corrected. My bad.

Actually the SK720 has flown on a logo 500, with a very similar setup, no power bus as it's a 500 size. Very smooth machines.
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04-03-2010 02:03 AM  10 years ago
Ronald Thomas

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Gainesville, Fl, USA

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Technically you are correct as the Logo 500 swings 550mm blades and a true "500 size" swinge 425mm blades Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!
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04-03-2010 03:04 AM  10 years ago
SpeedVision

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Grand Rapids, MI USA

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Looks like a fantastic package, Art! Nice work! Everything looks top notch!

Even though Mikado has taken a lot of heat for the dual purpose strategy of MiniV for small to medium and Standard V for medium to large, I really do prefer the separate sensor on my bigger bird. Not only is is more "user friendly" but it does isolate the gyro's from the "business end".

I'd be curious to hear your opinion relative to performance since "user friendliness" is subjective...
Flybarless - The future was yesterday...you in?
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04-03-2010 05:38 PM  10 years ago
t2o

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Pleasureville Ky

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The power-bus is optional; if you don't like it, don't use it.

Whats more, the bus could likely be used on any FBL controller making your Mini-vBar... or any Rx for that matter.. 700 ready?

I can't see any reason that the Bus could not be used in any application where High Current might be an issue. If I am wrong, let me know!
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04-04-2010 09:27 PM  10 years ago
Bruce2.5D

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Vancouver, Canada

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Re power busses, it's true that in most systems & receivers the servo bus itself can handle 12 amps for short bursts. The real problem is in feeding that bus. Servos keep getting faster, so their current spikes have gone way up. So much that dealing with brownouts gracefully is major headache for receivers and gyros. Now we're at the point where a single connector is only (technically) rated for one servo's worth of current.

So unless you use one power jumper for each servo (4?), or a small deans wired right into the rail, then in a technical sense at least, the system is under-engineered.

That's doesn't mean you can't get away with the way most helis are now, and I'm not meaning to knock anybody. It just means the hobby is evolving to where (I think) the current way of doing things is a bit borderline, and 2s lipos directly wired to a heavy bus will be the norm. You can already see at least 4 buss/regulator products meant to address this issue, so it's not hard to retrofit.

Just to throw it out there: Within 2 years, I expect to see high end servos with separate power and serial bus connectors, like sail winches
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04-05-2010 09:56 AM  10 years ago
Al Austria

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Sacramento, CA - USA

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Got a chance to fly this system yesterday on a Velocity 50. It was only the machine's second flight but I've got to say, it performed EXTREMELY well, especially considering it had not even been tweaked yet. Out of all the FBL systems I've flown(including the V-Bar), its pirouetting performance is probably the closest I've felt to a standard flybarred machine. Cyclic felt natural, more so than the V-Bar, and the machine locked in well while in a hover.

As an SK360 user, I felt it was lacking when it came to hard 3D. That said, the SK720 is a HUGE upgrade in performance. This system is going to be a contender for sure.
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04-05-2010 11:44 AM  10 years ago
Ben-T-Spindle

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Central Illinois

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It’s definitely time for me to order one and get on the list. Looks the SK-720 is going to be a very popular choice.

... BTS
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HomeRC & Power✈️Aircraft🚁HelicopterFlybarless Rotor Head SystemsSkookum › Skookum SK-720 Flybarless System
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