I have never been interested in electric power, but sice Lithium polimether bateries apear...
Now, can someone help me to find a combination of prop/engine/reduction/batteries to have 3d performance in a 5 lb plane (like a 70 class 4 stroke)? is this worth?
thanks,

Daniel

what about costs?

Maybe a hacker B50? You will want gear reduction probably about 5 or 6:1 to swing a very large prop. At least that is how it is with other electric 3D models.

The Axi 4120 range will probably do you. They have the power to swing big props and don't cost too much. Also being outrunner you dont need a gear box. The weight will be a bit higher, but you dont have to over enginer the plane as it wont have the vibration to contend with.

thanks, any more (preferently cheaper) ideas?

I have a laser 3d that I'll buid soon and was wondering the same thing .

keep us posted.

thanks,

epc.

Daniel,

A good electric set up w/ lithium polymers like you requested is really a great power combination but unfortunately not cheap.

with that in mind you can go with a hacker B50 series which comes w/ a couple of gear options along with wind options. both of these are married together, so to speak, based on the performance of the specific plane you are thinking about powering. With electrics, you will be able to pick your prop size and rpm, and is best to match both of these to the specific plane for best performance.

A 3D combo I have set up is a 60-90 size conversion w/ 6S4P Lithiums, swinging a 20 x 8 prop at 5800 RPMS or so. A Hacker B50 XL w/ gear is used in this application.

You can back up and look at cheaper motors w/ offset gears and nicad batteries, but weight penalties and duration issues are some of the drawbacks.

Good luck!

Rob

So, Lipo`s + brushless is an incredeble combination with an incredible price...
I know, I will never buy fuel again, but is more than a YS63!; now, can someone suggest me another combination (maybe another brand of a brushless motor) that won´t break the bank?
Thanks for your replys
Daniel.

Exactly what plane are you thinking about powering?

I have looked into this and it is just way cost prohibative. To get a Hacker c50 acro, controller, LiPo packs you will run $1000. For a grand you can have a lot of Gas motors. I don't think it will be too long before it will become more budgetable but right now it is quite extreme.

If you can stay in the 3-4 pound range the 40 class hacker can still have a BEC and it can cut some cost out but it is still more than a 50cc gas.

I had looked at the House of Balsa electric Edge and thought about bashing it for 3D but it is just too much of a project right now with a 35% on the table. But it looks like it might be a good size and weight to work from. You can find the info in the current MAN but it isn't on their website yet. ~40 oz. ~45" span

I also thought about using FanFold foam to do a built up wing, using a CF spar, then using Balsa to frame the FanFold For the tail surfaces, light ply and foam for the fuse. I am still thinking it through though but I would like to get about 50-60" span and 3D surfaces. I wish one of the "real" "Pros" would take this on as a kit or ARF. There is a lot of demand out there if someone could do it. I'm not a builder, except when I have to be.... I'd rather fly!

Bean

Here is the FG I was speaking of..