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Interesting. Why didn't you go Inav? ( lack of resource mapping? No target for this FC?)
Something to consider, for say a small wing. I prefer no FC/gyro on my 3d foamies. Quote:
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Inav is also good for airplanes, but the new FC usually supports Betaflight first, so I often use it.
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myxiplx, I am curious what motor, kv, battery and prop you are using in your Gripen (if your are using other than the TH Power Pack). There is very little info on this plane other than what you have posted here which is very helpful. I am looking to keep the plane light and am more interested in the type of flying you did in your garden than super high speed since I have a small space. Thanks.
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Last edited by u2builder; Oct 21, 2021 at 06:18 AM.
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The spec on mine is:
That spec with the motors relocated is a darn good all around model, it'll do big air and flies on rails, will harrier at about 30° really nicely, and has incredible roll authority. With the motors being on the control surface you have positive control of the model all the time and once you get used to the feel it really adds confidence flying on the deck. If you can fly 3D it's almost impossible to get the Gripen into a situation you can't fly out of. However if you want to really slow it down and fly in a small space, you need to add a gyro receiver. I wanted to try aero nishi's settings, so went with a Mamba FJI F722 Mini flight control board with a Matek F722-PX-W Fixed Wing PDB board, and a custom build of betaflight using aero nishi's instructions. It works great, but it's a real pain in the backside to solder, build and configure. Something like a Jeti Assist or a Spektrum AR637 would be a lot easier. :-) With a stabilised controller it'll harrier at 70° totally locked in, it'll slow down to a walking pace and is a total pussycat even at that speed. It'll also hover incredibly well, and flips are absolutely insane!! |
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Last edited by myxiplx; Oct 21, 2021 at 07:38 AM.
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Most excellent run down of specs... And much new tech that I need to become familiar with. Thank you for sharing that, you just jumped up my knowledge base by a few points. I am always grateful when someone does that. Mark R. old_coastie |
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Latest blog entry: bringbacktheumxjug
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Quick question, how comparable are the two Aura's (5 vs 8), was thinking of using mine as the "Wing" controller in a STOL plane and then using a ride along (dual bind) RX possibly even a stabilized RX like the Lemon for the remaining flight controls. Insights are always appreciated. o_c |
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Latest blog entry: bringbacktheumxjug
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https://www.rcgroups.com/forums/show...k-FC-on-Gripen |
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As far as I can tell the Aura 5 is exactly the same as the 8, but with 5 channels and no case. It uses the same set up. At $50 it is half the price and half the weight! It also has a built in launch mode (that I don't need with TH planes). The software has a bit of a learning curve. I had trouble with elevon set up on the Raptor but somehow got it. You have to remember to SAVE a lot or what you think you did may not have saved. I am definitely putting one on my Gripen when I get it, and may try an autolevel mode which my be good for something that happens too fast for my old eyes. The Auras have very nice adjustable stick priority which means as you move the stick further from center the controller doesn't fight you like some of the others. I am an Aura fanboy in my old age! Give one a try. I think they would best be used on the larger TH planes but I think the twin motor Gripen will be an exception. The Aura's have an option for dual motors which is cool. . |
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Edit: just found Gem Fan 4 x 2.3 3 blade at RDQ. Should be good. |
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Last edited by u2builder; Oct 21, 2021 at 02:56 PM.
Reason: Found it!
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I've actually flown the model with tri-blade 3040 props, and some 4050's, so it'll take a decent range of propeller sizes. The 3040's fly fine but were very loud, and I didn't see much improvement in speed with the 4050's.
I decided to try the 4025 to give myself a little more finesse in a hover and found they work pretty well as an all around blade. I suspect anything from a 4020 to a 4040 tri-blade would be fine. And a 5030 two-blade would probably also be a decent choice. PS. Interesting feedback on the Aura 5, those have been on my radar since launch but I've never found a reason to try them. My next Gripen is getting one for sure now! |
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I have been educated and exposed to so much because of RCG that I consider it well worth my time to wade thru the "hay" to find the "needles". If you follow my drift. Found more than my fair share of those needles in this thread.
o_c course there is always Ople (but he ain't human) |
Latest blog entry: bringbacktheumxjug
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Bit the bullet and ordered a second Gripen.
Gonna kit this out with a Flex Innovations Aura 5 and Blue Bird BMS-127WV servos. The Aura 5 website and manual impressed me and it could be a great match for the Gripen, and after doing some homework I also think I can get the overall weight down on this build. It looks like it might just be possible to get the AUW just under the 250g threshold even with a flight controller, which would make this a superb park flier. And as a bonus not only are the servos lighter, but now the servos and flight controller both support HV operation which means I don't need a BEC. I can power all the electronics using the balance lead and tapping into 2 of the 3 cells from the flight pack and run everything on 8.4V. Means I get to save weight whilst also getting far faster servos with way more torque, as well as battery voltage telemetry for free via the receiver. New spec:
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Re relocated motor mounts, is that going to be relocated with respect to your current build with them in the front of the elevons, or in respect to the factory version? |
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I'll be putting them at the front like my current build, but this time I'll be planing that from the start, so will do all the cutting ahead of assembling the airframe, and will also optimize the carbon flats to better suit that motor position.
There's also a ridiculous amount of yaw authority with these motors wide, so I'm planning to bring them in a little and fit them in the exact centre of the elevons, which should allow me to have the carbon bracing crossing neatly around the motor mount. Sent from my SM-G970F using Tapatalk |
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