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DJI › DJI WKM - H and Gasser
09-04-2013 03:04 PM  5 years agoPost 1
flyrchelis

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La Quinta, Ca

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Has anyone tried the WKM-H with a gasser. If so does it seem to work ok.

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09-07-2013 05:06 AM  5 years agoPost 2
Joel Rosenzweig

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Marlborough, MA - USA

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I have used it on a gasser. I set it up on a Bergen. It flew very well.

Wookong-H has better vibration dampening compared with Naza, and is intended for gasser and turbine environments (in addition to electric).

Joel

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06-25-2015 05:04 AM  3 years agoPost 3
Manol

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Hermosillo, Sonora, Mexico

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I see this is an old thread, but just installed Ace Waypoint in my Predator Gasser (similar to Wookong) and can't figure out or get any information regarding throttle curves for a gasoline engine and these controllers, I don't know if I should go with the manual recommended linear curve or use the gasser-like curve I used (in normal mode) before installing Ace Waypoint?
Any help will be appreciated, Thank You.

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06-25-2015 02:01 PM  3 years agoPost 4
Joel Rosenzweig

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Marlborough, MA - USA

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Manol,

These systems were intended for governor mode operation only. The reason is that the flight controller modulates the collective pitch to maintain altitude and it must have an adequate head speed at all times to maintain control. The Ace One and Wookong have governors built in, but you would need to add a Stator Gator or equivalent to your gas engine in order to use it. The Stator Gator is a device that generates a pulse for each revolution of the crank shaft. If you can't purchase one for your particular engine, you can always install a magnetic pickup, or an optical pickup to achieve the same. The flight controller doesn't care how the pulse is generated - it just needs to receive a compatible pulse.

Once you have the governor setup and working, you won't be using a throttle curve at all in ATTI or ATTI/GPS modes.

If you don't want to use the built in governor, you can install a separate governor such as a Futaba GV-1. No matter what path you choose, you do need to use a governed head speed for proper operation.

I hope that helps!

Joel

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06-25-2015 05:12 PM  3 years agoPost 5
Manol

rrApprentice

Hermosillo, Sonora, Mexico

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Joel.

Thanks for the information.
I'll be using the built-in governor, pre-Ace I used the Futaba GV-1.
I do use the Stator Gator, just wasn't sure about the curves, I'll just go with the same curve as Normal mode in ATTI/ATTI-GPS just in case the Gov. quits for some reason.

I really appreciate your help, I'll continue with my setup.

Best Regards.

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07-22-2015 09:12 PM  3 years agoPost 6
dscot

rrNovice

Citra, Fl - USA

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Joel,

Or anyone else that knows this system well...... Would the WK-H need a dedicated governor or could I get by somehow with running the Revlimit on the Spektrum AR7110R on a nitro version?

Wanted to try out the system on an older EVO 50 FB version with a 50 Hyper motor.
I ended up with a WK-H and really don't have much use for it but would like to try it out.

Could go Futaba TC7 & R617FS rec or a Spektrum 9303 & AR7110R radio wise if setting up is easier on either one.

Thanks for any input, suggestions, advise!

Thanks again, Scott

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07-22-2015 09:23 PM  3 years agoPost 7
Joel Rosenzweig

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Marlborough, MA - USA

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Scott,

The WK-H has a governor built in, which is useful for glo or gas motors. You still need to add a sensor to your engine to enable the WK-H governor to function. If you want to use an external governor instead of the one built in, you can do that. The important point is that the motor must be governed through some means. I am not familiar with how the rev limiter works. If it only keeps the engine from exceeding a certain speed, then it is not quite the same as a true governor which will maintain an arbitrary head speed for you. But, if it's actually capable of maintaining an arbitrary head speed as loads change, then the rev limiter would be ok. I haven't touched a glo motor in a number of years now, so I just don't have practical advice on the rev limiter for you.

Setup is straight forward for most radios. However, it's best when your transmitter has a 3-position switch that you can use to set the flight mode. You need to be able to toggle between [manual] / [ATTI] / [GPS+ATTI] modes. If you only wanted two modes, you can do that, too. You must choose [manual] mode as one of your modes though, and then can optionally choose [ATTI] or [GPS+ATTI]. So whichever radio makes it easier for you to setup endpoints for high / middle / low switch positions is best!

Good luck,
Joel

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07-23-2015 12:34 AM  3 years agoPost 8
dscot

rrNovice

Citra, Fl - USA

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Hello Joel,

Thank you for the quick reply! Looks like I'll need a real governor the manual on the Revlimit has this in it:

"The Spektrum AR7100R features an integrated RevLimit limiter. The
RevLimit functions as a digital rpm limiter preventing the main rotor from
over-speeding. When the rotor speed is at or below the programmed
rpm, throttle position is controlled via the radio (i.e. throttle curves). The
RevLimit only engages when the rotor rpm exceeds the programmed rpm
reducing the throttle position preventing over-speed"

Got the WKH in a package deal and has only been mounted so far never flown yet so I'll put it and the EVO off to the side until I pick up a real governor. I did not think it would work but had to ask!

Thanks again, appreciate your help.

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