Der Goetz

My Feedback: (9)

Heya Guys!
I got the motor at a decent price and already got the Castle HV-85 after contacting Castle and them giving me the ok for that setup.

I will be running 10s LiPo.
Question is: What prop should I run? I am obviously a speedfreak and want this thing to go as fast as possible.
Unlike the pattern guys with 22*10's I would like to go higher pitch than that.
What options do I have?
Right now I am looking at Thin Electric Props in

18*12
19*12

Or I can go and get a
20*13 and clip it it 18*13
or
20*15 and clip it to 18*15

I know I would loose some efficiency, but oh well.
But I am afraid that 15 might be too high and that the prop will never "grab".


Question part two:
I am building a harness to accommodate my 2100's. They are 3s and 20C. I already own 12 of them and this is the only way I can afford the hobby...break down the big packs. Plus I will add one single cell-pack on each set making it 10s (3*3s plus 1s).
So, I was thinking (as of now) to run two sets parallel for 4200mAh at 20C. Will this be enough?
Or should I run 3 sets for 6300mAh? The plane would take it, but I would obviously use 30 cells instead of 20 cells per flight, which would force me to recharge before the next flight instead of being able to "hop" between battery packs.

What do you guys think? Please help, this is a new area to me.
Thank you and best regards,

Götz

gniessen

My Feedback: (5)

According to ElectriCalc it should be able to swing a 20x12 just fine. I am going to swing a 24x6 on a big Fokker D-VII, but that obviously if a slower plane. How much prop clearance do you have? You might want to go to a 3-bladed prop for more of a scale appearance.

But I would keep things simple to start with 3 of your 3s packs in series and then run a 2 or 3 parallel strings. That would be much easier to maintain and then you could decide if you wanted to bump it up later with another 1, 2, 3 cell pack in series. I'd build a board with Deans connectors to keep it neat. Or they may sell them.

A10FLYR

My Feedback: (1)

My experiance dictates 3P if you are going to pull max amps, and it sound like you are. I've cooked to many packs pulling the amps you are considering by using 2P. All TP 2100s. APC 19/8 E.

d_wheel

I agree with A10FLYR. I am using the same motor on a GP Patty Wagstaff Extra 300, using a 20x11 prop, and 10s4p 8000 pack. My watt meter shows 3000 watts on a full charge, and it will still give 2800 watts after 15 minutes. However, the battery temp reaches around 130 degrees f at this point. I usually fly pattern style maneuvers during the first 10 to 12 minutes. The throttle will go from mid stick during level flight to full during verticals and zero stick during down lines. I average about 800 watts for the flight and pull around 4 to 6 amps out of the pack. Trying to use 2p would shorten your flights quite a bit and possibly damage the pack. Also, you will have to provide plenty of colling air flow over the pack.

Good luck with your project and please keep us informed of your progress!

D.W.

Der Goetz

My Feedback: (9)

Oh, thank you guys for the advice!

I have plenty of clearance and would not consider 3-Blades due to their poor performance if scaled down.

And I just read the last post, I will obvioulsy go with a 30cell setup at 2100-20c, in 3p.
Thanks guys, that was awesome (and expensive, hahha) advice!

Regards,

Götz