Re: Zagi 400 conversion to Lipo and Camera setup options?

markm75 wrote:
Motor ESC confusion:

As you have seen.. I found the Astro020 here
http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXFFK9&P=7 for
$150.. this included a 25 amp ESC (which I could find the motor for
about $88 and the esc for $48 elsewhere), but it also included the
deans plug and prop 5.5x4 and prop adapter (I'm not sure what these
would cost seperately)..

I'm confused on using say a 3s 2100 or 3s 3200 15C lipo pack with this
motor, as most specifications show the rpms with 8cell nimh packs..
they list the rpms at 18,700k and 20 amps.. but I would have to assume
that with a 3s pack, the amp draw would be higher (how to know for
sure?).. though i did see a spec of 3s/ 20amps/ 31700 rpm, another
showed 3s 30 amps/ 270 watts/ 30000 rpm.. but didnt list which size
prop was giving those numbers.. base question is.. how do I know
whether the 25 amp esc is enough for this unit given a certain size
prop..

There is also the Mega 16/15/4 (or 3) motor.. which is a better
performer. the 16/15/3 or 4?

At different voltages, they perform identically. The /3 is a bit hot for direct drive except in ducted fans or 2s LIPO.
They both appear to be the same price,
with many combo deals going for $129 (base motor around $88 as well,
usually with 25 amp escs).. again.. the 15/4 shows 8cell on a 5x2
giving 19200 rpm, 6.4 amp draw, using 18amp esc.. would a 5x5 on Lipos
give higher amp draw being as the pitch is higher.. meaning I'm not
sure which ESC/prop combo is the right one for this motor..


you can load a /4 up to about 20-25A..its a hell of a motor.

Probably a 6x4 or 5.5x4.5 for a zagi. Should be close to 18A on nickels, more on 3s LIPO.


Again, I'm comparing to my 15,200 rpm I have now with 9.8oz 1700mah
pack.. whereas with the Lipo it may be half that weight.. I guess I
shouldnt always just look at the RPM values as comparison, but I'm not
sure which of these combos would give me the best performance per
price.. they both seem to be similarly priced in the end.

Of course.. if they blow away the speed I have now.. and i'm too
chicken to get fancy at high speeds, I may find myself at like 1/3
throttle for most of the time anyway (lol).

I searched around for hits on 400 zagi and these motor choices, not
alot of details out there.

Thanks for any help on deciding between these two/ which ESCs/prop to
pair up etc..



.

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