Please explain this to me like I was an IDIOT!

[furyphoto]

After months of reading, and about a million crashes on G3 I am so close to pulling the trigger on my Swift.

Thing is, I can't get my head around what motor to get for AP.



Here is what I think I know....

- For AP a nice low head speed will be stable, say like 1600-1800

- I am after the most efficient system for Lifting power and Flight length

-It makes sense to me that smaller pinion will put less strain on the motor, hopefully resulting in less current draw, and longer flights. So 9T is probably the best for my application.



So... Would it be better to run a Higher KV moter with a lower voltage, higher MaH Pack, or a lower KV motor with a higher voltage , but lower Mah pack. Remembering that lifting, and flight length (and budget) are of importance.


Here is a hypothetical example... (emphasis on hypothetical!)

considering 9T vs 96 on the main gear... 96/9=10.67 ratio
Assume motor efficiency is 85%

8S1P,3000MaH with 750KV motor - (28.8x750x.85)/10.6 = 1732 Headspeed

VS.

4S2P, 6000MaH with 1500kv motor - (14.4x1500x.85)/10.6 = 1732 headspeed


In hypothetical theory, both of these systems weigh the same, and have the same head speed. Will one lift more weight, and/or fly longer than the other? Will one lift more weight, while the other one flys longer? How do you find the balance? :?


I am really just trying to gain an understanding of how the mechanics work so I can make an educated purchase. If I was a simpler man, I might just buy what someone told me to, but I am cursed with having to understand it before deciding! Go figure.

I will appreciate any and all input, and will not get offended in the least at any response, like I said explain it to me like I'm an idiot (please use small words!)

Thanks,

Andy

[BungeeMike]

After careful review of your data its really pretty simple.
Call Joe at Joker Usa buy a maxi and let him figure it all out. :D
Bungee

[LoopBaCK]

I think, with no disrespect intended, you're overthinking it. :) :)

Maybe to help the need to understand you could try a typical engine such as the Century 600 but get some different size pinions to play around with.

I've been using one for a few months now (with 10T pinion) and have had great results. Mine is this:
Century 600 with 10T pinion running 530mm Carbon Blades
eMoli 7s battery on a Castle 45HV controller

It's not the perfect setup but works for me. Sounds like you've prepared well and are very ready for that next step.

[oscillator]

Andy,

excellent questions. My understanding is the motors are most efficient when running flat out - so that would point to the lower KV motor (assuming both motors were equally efficient). Of course efficiency of motors can vary considerably - and I don't know how to get that data other than testing motors or asking around.

Ideally, you would want the lowest headspeed that gave sufficient lift and stability with the motor close to flat out and a reasonably small pinon - say 9-11T.

Cheers,
Mark

[askman]

for swift, I think one of the zpower z50A 600kv motor or z30A 800kv motor would be good depending upon voltage. I am planning on 600 for swift on 10S A123. running 100% is way to go in throttle mode. (no governor) with smooth AP flying, you are almost better off anyway. I don't mind using slightly bigger pinion to get right headspeed in AP, as we are not concerned with peak power or bogging anyway. I like to fly at 1700-1800rpm if possible with 550. I've flown down to 1600, and it actually may be better for video as it was very mild.

[furyphoto]

Well, I am planning to run emoli's for starters, so a 7s with the Z30 800 and a 9T, or with the Z50 600 and a 13T would seem to be good choices.

Does anyone have these motors in stock? The only Z50 on TPPacks is the raptor conversion, but is certainly won't fit the swift without mods. Is there a different version? and the only place I can find the Z30 800 is in Austrailia.

Does anyone have these motors in stock?

Thanks

[askman]

pm gary, he is going to have z30A by tomorrow or monday. and 50A monday or tuesday. he was supposed to update his website today/tomorrow.

[qb7ops]

Well, I am planning to run emoli's for starters, so a 7s with the Z30 800 and a 9T, or with the Z50 600 and a 13T would seem to be good choices.

Does anyone have these motors in stock? The only Z50 on TPPacks is the raptor conversion, but is certainly won't fit the swift without mods. Is there a different version? and the only place I can find the Z30 800 is in Austrailia.

Does anyone have these motors in stock?

Thanks

Touch base with Gary at tppacks.com. Although not currently listed on his site, I believe he will have the full Z-power line listed shortly.

[furyphoto]

Thanks Guys,

I see that Gary has updated the website, although everything is currently out of stock.

SO which one should I put my name on the list for? Z-30A 800, or the Z-50A 600?

Also, will I do ok with a CC45hv, any reson to get the 85?

Again, planning to run 7s emolis for now.


Thanks.

-A

[askman]

cc45hv is more than adequate for swift. on 7S or higher. are you planning on stretching it? if you are planning on stretching down the road or higher Voltage, go with z50, otherwise, z30 looks like good on 7S upto 550mm setup.

[furyphoto]

Thanks,


I think I will go with the Z50, I eventually want to hang a DSLR under it, so I will likely stretch it down the road.

I have sent a message to TPPacks to be put on the waiting list!

-A

[GGoodrum]

Actually, if you want to carry a DSLR you don't HAVE to do a stretch. A Z30A will easily handle any AP setup up to 600 blades, with gobs of power. I have a Z30A-800 in my Logo 10 Carbon and it only has 500 blades, but weighs 9-1/2 pounds with the Pan-LG mount and a 2 lb camera/lens assembly, and it still works great. A Swift with 550 blades will easily handle a DSLR, in my opinion.

Since the a123 cells cost about the same as the eMolis, I'd definitely go that route, rather than eMolis.

-- Gary

[furyphoto]

Thanks for all the advice guys, Z30A 800 ordered!

Can anyone think of any reason I can't charge the A123's with the Dewalt charger for starters if I am using a 10s configuration, and hook all the cells up to the Dewalt circuit to match the factory configuration; in a similar fashion to the V28 charger conversion?

-A

[askman]

you can do that. mainly, there is lot of connections to make to hook it up. beside the a123 charger cost fair amount and takes about 1hour to charge. I like being able to charge in 30min. :)