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TOPIC: G-Air - Eone

G-Air - Eone 1 year 1 month ago #164

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Well, the motor I use in this setup is a standard 12090, not a 12090/S (sensored). So yes, it's a guessing game for me. But it would be super nice with telemetry and some live data recording.

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G-Air - Eone 1 year 1 month ago #165

Hey, nice looking unit. Beautiful curves, which we all enjoy... on many desires...

Wondering what batteries are you using and what's the weight? I ask because you have them mounted on the bottom of the frame where the petrol tank is normally located. Have you tried putting them closer to your waist? We have found that to be more comfortable, but it depends on weight. Our batteries are 8 and 13 kgs, but a lighter one is coming that should put our total weight at under 19 kg, and we have tested a battery that works for only about 10 min that puts the total weight at approx 17.5 kg. At that weight, the placement is less critical and maybe it helps in flight...
In our video, we show a frame modification that has increased comfort by eliminating a bottom bar on the frame and replacing it with a kickstand. If you want more details, let me know..

Also, we are using the MGM Compro motor controllers and have been for about 4 years. They are twice as expensive as the Chinese units, which we have tried, but you really do get what you pay for. In this case, telemetry, and 12 minutes of flight data. And they are LIGHT - half a kilo. The company has incredible service, but some of their software is ... difficult, and the manual is an adventure in itself. We have blown up one (my fault) but they are pretty robust and highly programmable. I keep looking for something comparable and cheaper, but not found it, although the US/Euro rate now makes the MGM unit less expensive in the US.

You may already have this for measuring temps, but we use a cheap IR temp unit, Digitech from memory, which we have also found very useful for checking controller data.

look forward to further posts..

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Last Edit: by ozeflightclub.

G-Air - Eone 1 year 1 month ago #166

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The problem with MGM Compro is that they can only handle up to 15S. For the Eone project I use 18S (66.6 volt). But yes, they make some real nice products.
As mentioned, this setup is only for testing the concept. The idea is to use as many "standard" components as possible. For example, from the RC community. The batteries I use are from Hobbyking. ZIPPY Flightmax 30P - 6S 8000mah put together in a 3S2P configuration which provides 66.6 volts 16.000mah.

It would definitely be better to mount the batteries further up. But I don't really care to modify the cage as it is only a temporary solution. The weight is 22 kg. with batteries and everything. The batteries alone are approx. 8 kg.

I saw how you modified the bottom of the cage. It's really good thinking. For sure, something that many can benefit from. But it's not relevant for my current project. My setup will at some point be built into a traditional XC harness... as a start assist system ;-)
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Last Edit: by Gamba.

G-Air - Eone 1 year 1 month ago #167

ah, yes.. I do remember that now about the setup.

I replied in a battery thread about the Flightmax graphene.. 16 ah 6s... very nice. I used them succesfully but the voltage was just a bit too low at 2S. recommend them if you want to get rid of the 2P.
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G-Air - Eone 1 year 1 month ago #170

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Doing some refueling...

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G-Air - Eone 1 year 1 month ago #173

OK he's back. things will be gathering momentum and the bank balance will be taking a hit....mans gotta go what a mans gotta do :-)
few quick questions if a may ( as always with me ) ..
E-prop Spec and part number .... at the moment I have 2 wooden props I was going to use just for spin up testing but seeing as most favour the carbon fibre option, I think I'd better start saving ..

Did you have any synch issue using the sensorless C12090 ? I actually had the same controller as you but panicked when I heard hoorro stories about controllers and Bruno at Alienpower systems such great service he exchanged mine to the 450 amp sensored one I have now .. ( you cant fault the guy backup and service is great )

Motor mounts ? any preferred brand ? type ? supplier (I do have the ones off my Donor paramotor but new might not be so bad )

Cheers Bo

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G-Air - Eone 1 year 1 month ago #175

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The prop I use is the one for Polini THOR 100. I would like to try the one for THOR 80. I have an idea that it fits better with my setup. On the other hand, I have no problems with the overheating of neither the engine nor the ESC. This is the one I use now: www.shop.electravia.fr/catalog/product_i...00&products_id=10144

I still need to play some more with the timing on the ESC. The setup works fine but sometimes the motor can still shortly make a high pitch sound at high rpm. No doubt that a sensored motor would be better. In the long run, if I can't get rid of the noise by fiddling with the timing, I will try a THOR 80 propeller. It has a little less resistance.

Motor mounts... I'm not sure what you mean. For which motor do you need a mount. Do you have some pictures or drawings.
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G-Air - Eone 1 year 1 month ago #176

Hi... we do not use motor mounts any more. If you have a well balance prop, there is so little vibration that they are just unnecessary. We did put a 6mm hard rubber grommet between the motor and the mounting plate. Haven't noticed any difference from when we had the rubber motor mounts.

Regarding the prop, we have used several, incuding the eprop 125 for the HPD 13. we have, however, gotten heating problems with the motor, which is direct drive (and not an HPD).

Oz-e Flight Club
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G-Air - Eone 1 year 1 month ago #177

Yikes! that looks complex. We use 16 ah and 20Ah packs and run them in parallel if we need to. The 20 Ah packs are doing fine and cost about $350 each for 14 S. They can be made up to any 'S' you want.
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G-Air - Eone 1 year 1 month ago #178

Hi Bo.. attached is a summary of our testing with different timings for our 15 kW motor. On this motor, as the timing advances, the peak currents and power reduce but the motor heats up more.

Our larger 18 kW "pancake" Rotex motor stays pretty cool and handles peak currents much better... of course.. under a 130 helix prop and 137 folding Bolly prop.
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G-Air - Eone 1 year 4 weeks ago #179

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ozeflightclub wrote: Yikes! that looks complex


Hehe... That's the way to do it when choosing to use cheap hobby components :-). You can't really buy cheap chargers that can handle more than 6S. But yes, I will at some point get some bigger batteries so I don't need so many.

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G-Air - Eone 1 year 4 weeks ago #180

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Hey guys.
I have an important question that I could use some feedback on. The Eone is pretty much ready to put on sale. The retail price on a gear system, without motor and ESC, is going to be 624 EUR. That's more expensive than I hoped. The whole idea was to make a cheap solution for DIY people.

Our problem is, that we produce all the parts in-house here in Denmark. The gear consists of many parts and machine time is expensive in Denmark. With this price we make almost no money. But that's fine. We don't do it for the money. We only need to cover the costs. We could probably make it significantly cheaper by outsourcing the production. But we are not really interested in doing that. All the fun would go away and we would no longer have control over the quality. It would probably also require larger quantities to get the price down.

And now my question... What do you guys think about this price tag. Flemming and I have to decide if we realy bother to put the Eone on the market. No matter what... although we have spent a incredibly amount of time on this project, we do not think it has been a waste of time. It has been really fun and very educational for us.

Please... It's important that you guys are brutally honest in your reply.

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