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Feb 17, 2020, 08:16 PM
Registered User
RCTyped's Avatar
Quote:
Originally Posted by crash_tested
Iíve got a Spektum DSMX Satellite

I donít know why the receiver would be an issue, but Iím open to possibilities


How do you have it mounted?

I put mine under the back of the tail boom using a Gorilla tape adhesive square. Havenít flown it yet due to weather and work.


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Feb 17, 2020, 10:22 PM
The Other Side of Your Screen
SilverSport's Avatar
Quote:
Originally Posted by Freeskiken
Found this.

Quote: The Nano Tech appear discontinued now, but dimension is listed as

72x25x20mm and weight as 69g

https://hobbyking.com/en_us/turnigy-...lipo-pack.html

I think packs up to 65mm long or so will fit, the 25 x 20 dimension is close to the OMP packs. The 72mm is just a little too long. It will fit, but you have to really squeeze the canopy on.

The OMP packs are 58x25x22.5 and weigh 58g for comparison.

https://ohiomodelplanes.com/collecti...30146088796203
I can't say where OMP got those figures from, but I have 5 OMP packs, all are 61 x 25 x 22 (one is 60mm long) and the average weight is a little over 59g. Maybe the don't measure from the same point I do!
Feb 17, 2020, 11:28 PM
Easily Distracted
crash_tested's Avatar
Quote:
Originally Posted by RCTyped
How do you have it mounted?

I put mine under the back of the tail boom using a Gorilla tape adhesive square. Havenít flown it yet due to weather and work.


Sent from my iPhone using Tapatalk
Iíve got mine Gorilla taped to the top of the control unit

I didnít think that would be an issue.

Is this a poor place for the receiver?
Feb 17, 2020, 11:55 PM
The Other Side of Your Screen
SilverSport's Avatar
I have my SpekSat servo taped to the frame on the right hand side right past the canopy pin where the canopy does not hit it. There is not a lot of tape covering both the Sat and the spot on the frame. I couldn't think of any other spot that would work well in most situations and minimize damage in case of crash ..... these spek sats with the short antennas are not available new anymore, and even the Lemons are now coming only with the long antenna's . I like short on my heli's.
Feb 18, 2020, 02:15 PM
Northampton UK
I've got the Spektrums SPM4650 receiver for when I get my M2 and cheaper than the DSMX also has built in bind button.
Feb 18, 2020, 02:43 PM
Easily Distracted
crash_tested's Avatar
Quote:
Originally Posted by tourerjim
I've got the Spektrums SPM4650 receiver for when I get my M2 and cheaper than the DSMX also has built in bind button.
That seems pretty cool

Nice find

Of course they’re back ordered at horizon though

https://www.horizonhobby.com/dsmx-sr...led-p-spm4650c

Edit:

Looks like there’s a new version


https://www.horizonhobby.com/SPM4651...8aAvfKEALw_wcB
Last edited by crash_tested; Feb 18, 2020 at 08:23 PM.
Feb 18, 2020, 05:32 PM
Slideways at warp speed.......
kiwi_craig's Avatar
Nice review by John Salt. John publishes a really nice series of digital books on RC heli flying.

OMPHobby M2 Helicopter Review & Flight (22 min 46 sec)



https://www.rchelicopterfun.com/about.html

https://www.rchelicopterfun.com/rc-h...r-e-books.html
Feb 18, 2020, 08:12 PM
Easily Distracted
crash_tested's Avatar
Quote:
Originally Posted by kiwi_craig
Nice review by John Salt. John publishes a really nice series of digital books on RC heli flying.

https://www.youtube.com/watch?v=rSQPMPPGoYc


https://www.rchelicopterfun.com/about.html

https://www.rchelicopterfun.com/rc-h...r-e-books.html

Iíve seen that video, itís entertaining indeed
Feb 18, 2020, 08:58 PM
Registered User
Hi folks, just a quick update on my custom flight controller project for the OMP M2.

I got it flying back at the end of January, but then I went on vacation for a week, came home, got a bad case of the flu for a week, and now am finally getting back after the project. After tuning the feedback loop PIDs to the limit of oscillations the tail was holding fairly well, but I wasn't really happy with the cyclic control performance. Analyzing the logs showed that the limiting factor was the 35ms system delay caused by the servo travel time and the phase delay in the rotor head. I tried a couple of interesting things to mitigate this including coding up a delay compensation block, but the obvious and final solution was just to use a big helping of feed-forward from the cyclic input commands directly to the servo output mixer. It's now flying pretty dang nice and robotic on the cyclic, much like the original M2 controller.

My next step is to begin adding code into Betaflight so that it will know what Collective Pitch is. Right now I'm just passing the collective channel directly through into the swashplate mixing. Once I start keeping track of collective inputs I can begin using that information to do pre-compensation for the tail motor control. After that I'll write a simple governor for the main motor that also uses collective pre-compensation logic.

I also tested out the self-leveling mode in Betaflight by assigning it to a button on my TX. It works nicely after a bit of tuning. I'll need to tinker with the code for the self-leveling mode to create a true "rescue" mode that ignores cyclic inputs and gives a collective punch-out after leveling the heli, but that should be pretty straightforward once I get the time to do it.

Overall I'm really pleased with the progress and hope to make a lot more headway in the next week or two.
Feb 18, 2020, 10:06 PM
Slideways at warp speed.......
kiwi_craig's Avatar
pretty cool, but what is the end objective to this exercise ?? it sure sounds like allot of work ??
but hey if coding and related is your thing then all good fun right. It would be nice that some works out a decent heli coding for all these quad controller units.
Feb 18, 2020, 10:06 PM
Registered User
Just wanted to let everyone know that I've created a new thread for the flight controller project and have included more details on the hardware I'm using and links to the code over here:

https://www.rcgroups.com/forums/show...ller-%28FBL%29
Feb 18, 2020, 10:12 PM
Registered User
Quote:
Originally Posted by kiwi_craig
pretty cool, but what is the end objective to this exercise ?? it sure sounds like allot of work ??
but hey if coding and related is your thing then all good fun right. It would be nice that some works out a decent heli coding for all these quad controller units.
There is a ton of awesome miniquad technology (FC, ESC, and bi-directional telemetry) that isn't really being utilized on the helicopter side, so why not? It's about time there was a good open-source helicopter flight controller, and I think the mini and mid-size helis could really benefit from that new technology in a a lot of areas - performance, cost, and weight savings.

As far as difficulty goes... well, it is a hobby after all - might as well take it to the extreme!
Feb 18, 2020, 10:52 PM
What Goes Up...Must Come Down
abjets's Avatar
It is all about the hobby!
I'm trying to figure out a versatile battery securing setup for a few of my bigger batteries...while still retaining the use of the stock battery tray and battery for the one include with the aircraft. Fully implementing the KISS system Cool bird and excited to get her flying soon.
Feb 18, 2020, 11:24 PM
Slideways at warp speed.......
kiwi_craig's Avatar
Quote:
Originally Posted by eqtrian
There is a ton of awesome miniquad technology (FC, ESC, and bi-directional telemetry) that isn't really being utilized on the helicopter side, so why not? It's about time there was a good open-source helicopter flight controller, and I think the mini and mid-size helis could really benefit from that new technology in a a lot of areas - performance, cost, and weight savings.

As far as difficulty goes... well, it is a hobby after all - might as well take it to the extreme!


yup ! there was a heli settings on the original open pilot / CC3D unit, but it got dropped due to a lack of uptake, or so they said, could have just been a bunch of drone guys who couldn't be ars*d............................

things like basic telemetry, 6g stability, "rescue" "bail out" "Safe" etc are finding there way into most heli FBL systems, and have been around for awhile on Spirit, Beast X pro, MSH ibrain, and several other units............ , GPS positioning etc etc is all available on the Spirit and Naza H h
I'm guessing the $50 controller is appealing vs the $200 - $400 heli FBL..............
Feb 19, 2020, 09:56 AM
Registered User
keithy4129's Avatar
Quote:
Originally Posted by kiwi_craig
Nice review by John Salt. John publishes a really nice series of digital books on RC heli flying.

https://www.youtube.com/watch?v=rSQPMPPGoYc


https://www.rchelicopterfun.com/about.html

https://www.rchelicopterfun.com/rc-h...r-e-books.html
I own all of his material, great guy.


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