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Latest Lemon DSMP/X 7 check Plus Stabiliser

Asking for experiences

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Philip Baker28/01/2019 19:14:45
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50 forum posts
48 photos

Initial flight tests with this rx in a slope soarer are impressive.

I have the top pin model with no satellite and just a 29mm aerial. I was worried about range, but I flew the model far enough today to be happy.

Does anyone have experience with this rx, particularly in setting it's fail safe mode? Mine is bound to a DX-18 so channel 8 adjusts gain and a 3 position switch selects no stab, gyro, or full self levelling. Seems to work well although self levelling seems to be only for panic mode.

I have set fail safe as per the manual, but am not brave enough to deliberately test it in flight as it takes about 10 seconds to reestablish control.

Brian Hammond28/01/2019 21:47:42
299 forum posts

Iv,e been using 2 of these Lemon jobs for a year or more and found them great.

Denis Watkins28/01/2019 22:04:24
3874 forum posts
58 photos

You can turn the gain down Philip, then all modes work better in flight

Now if you turn off a Tx in flight ! ! ! It would take a long time to load and reboot

Do this on the ground

But an Rx loosing power one or two seconds, will reaquire in about 2 seconds

David P Williams31/07/2019 10:37:50
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840 forum posts
282 photos

I have one of these that I am going to fit in a HK/Durafly Tundra to help when it's breezy. I have a flap/ down elevator mix on the Tundra at the moment as it balloons like mad on lowering flap. Do I leave this mix on with the stabiliser or will the stabiliser sort it out? The attitude of the Tundra doesn't really change on flap deployment, it just rises rapidly, so as the stabiliser doesn't have any kind of height hold I guess it won't do anything. Have I just answered my own question?

Simon Chaddock31/07/2019 11:28:45
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5438 forum posts
2850 photos

David P

As adding flap increases lift for the same angle of attack you have to expect the plane to rise.until its speed has decayed to the point that lift matches its weight.

This could only be countered automatically if the 'stability system' also monitored throttle, air speed and flap angle. A full autopilot with auto throttle engaged?.

.

.

David P Williams31/07/2019 12:12:11
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840 forum posts
282 photos

Appreciate that Simon, it's just that I've never used one of these stabiliser things before and I'm not sure if or how any mixes affect them. I think they won't - I guess I'll just try it and see.

Frank Skilbeck31/07/2019 12:40:15
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4444 forum posts
101 photos

I assume when you say ballooning you mean that the model raises it's nose.

If you have a mix on the elevator and you are in heading hold/self leveling mode the gyro will see that as an instruction to rotate the plane around that axis and move the control accordingly, so best not to have a Tx mix active in those gyro modes.

Shaun Walsh31/07/2019 12:44:37
182 forum posts
12 photos

I have one in a Hobbyking Slowpoke and have been quite impressed. The first setting helps smooth out flight in gusty wind, you can see it working as the plane gets blown around. It also corrects for tail swing on take off. Never used the second, panic recovery, mode in anger but it does seem to work, you just have to ensure that you have taught the receiver what "level" is. On my first use of the panic mode the model flew with a slight left bank and a slight dive so I had to reset the gyros and now it works fine.

The only thing I might fult is that it takes a long time to bind with the transmitter when you plug the battery in.

Shaun Walsh31/07/2019 12:55:02
182 forum posts
12 photos
Posted by David P Williams on 31/07/2019 10:37:50:

I have one of these that I am going to fit in a HK/Durafly Tundra to help when it's breezy. I have a flap/ down elevator mix on the Tundra at the moment as it balloons like mad on lowering flap. Do I leave this mix on with the stabiliser or will the stabiliser sort it out? The attitude of the Tundra doesn't really change on flap deployment, it just rises rapidly, so as the stabiliser doesn't have any kind of height hold I guess it won't do anything. Have I just answered my own question?

From the quick guide to the Lemon stabilised receiver.

It is mandatory that any elevon (delta wing) or V-tail mixing take place in the stabilizer and NOT in the transmitter. Such mixing is controlled by the settings of switches J4 and J5, as shown in the illustration on page 3. Use of the transmitter for elevon or V-tail mixing is permitted only if stabilization is turned OFF at the receiver (switches J4, J5, J6 OFF). By contrast, other types of mixing, such as flaperons, aileron differential or aileron-to-rudder, are managed as usual in the transmitter. When this is done, switch J6 should be turned on to activate left aileron stabilization on channel 6 (AUX1). The Complete Guide provides a full discussion of this issue.

Edited By Shaun Walsh on 31/07/2019 12:57:24

Kim Taylor31/07/2019 13:43:09
279 forum posts
53 photos

Also don't use auto level (panic) IF you've got any flaperon or differential aileron programmed in.

I don't know what it does, but it's been flagged up as a problem on another site (and I think it's in the latest instructions anyway).

Kim

David P Williams31/07/2019 13:44:56
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840 forum posts
282 photos

Thanks all.

It climbs, quite a lot, with flap. I'm not sure whether the nose rises much or whether it just goes up like a lift. I only intend to use the stabilising mode, not the full self levelling, it's just to help out when it's gusty like Shaun's Slowpoke.

I had read the quick guide, and appreciate that it states that flaperons, aileron differential and aileron to rudder act normally. I was just after confirmation that flap to elevator mix would be OK too. J6 doesn't need to be on as the ailerons are on a Y lead on channel 2 and channel 6 (Aux1) is flaps. Channel 5 is currently ESC reverse (it has a reverse for use when on floats, but I don't need that at the moment) so that need to be reconfigured to be norm/stabilise/self level selection. The reverse could go on channel 7 (Aux2) if I need it.

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