The SG E12

[trillian]

I haven't been in any rush to finish it but there's very little to do as the airframe was already built. So the servos are on and the FBL unit is on and is partially setup. The spare motors I have right now are a bit high KV but I'll fit one temporarily if I don't find what I'm looking for in the meantime. I'm thinking a good choice is the Scorpion 4525 / 370 but I'm hoping to find a good 2nd hand one, we shall see.

The drivetrain is so silky smooth and has so little drag. The only other helis I have with similarly free-spinning drivetrains are the Kasamas.

Anyway, I'm now keen to get it flying so I'll probably get it finished sometime next week.

[DCflyer]

Tri setup nice. What headspeeds do you intend to run? A 370kv might be a little low I would think, even for a 3 blade, unless you're planning on running very low headspeeds. I would think 450-500kv would be much more well suited.

[trillian]

Originally Posted by DCflyer

Tri setup nice. What headspeeds do you intend to run? A 370kv might be a little low I would think, even for a 3 blade, unless you're planning on running very low headspeeds. I would think 450-500kv would be much more well suited.

It will be a matter of finding what works best but I run my Triabolo at 1290 and it works amazingly well at that speed.

With only a 96 tooth main gear it's not easy to get the E12 down into lowish territory. I would think the most I'd want is maybe 1400-1500. So even with the 10 tooth pinion at 370KV my governed headspeed would be 1520, I'd have to run a bit below the Jive sweet spot for anything lower. To get even 1400 would put it at 55% throttle.

--- update, looks like I have a Scorpion 4035/400 coming, so we'll give that a try and see how it goes. ---update 2 - also have a Pyro 700-45 coming now as I was offered a good one 2nd hand.

[malc1]

How easy is that head to setup Sheryl?

[trillian]

Originally Posted by malc1

How easy is that head to setup Sheryl?

It's very easy in my experience thusfar. I have built two other JR heads, the MB 331 and 351 and the fit of all the parts has been perfect, links fit exactly right, not too tight etc.

It did take me quite a while adjusting the links on the 351 head as I just couldn't seem to get all three blades totally matched in pitch but I finally got it close enough to where the tracking looks fine.

On the 331 head I cheated and used a couple turnbuckle links I already had that were close enough to the right size.

The E12 is pretty much ready to fly now, just need to double check a few things in the FBL setup. One thing I discovered once the motor was in is that it is very tail-heavy with anything smaller than 5000mah packs and I like to be able to use 4000s or even 3500s sometimes.

So I have a mod that allows one pack to be mounted in front because otherwise the nose portion under the canopy is completely empty. I can get a good C of G this way with really small packs. For anything about 4500mah and up it's fine with both packs underneath. (the motor wires exit rearwards because originally I was going to put the ESC in back but moved it to the front when I discovered there was a C of G issue.)