winter build ideas/plannin (dual cat)

[bea5017]

tryin to figure out my power system so i have an idea of how big to size down one of my cat plans... i want to try a dual outrunner setup, i am fairly inexperienced with out runners but i have 2 new 2s 5000mah 30 c packs waitin to go in somthin.. i dunno to run 2s2p or 4s1p as any outrunner motors ive seen hade low kv and any that had the approx 2300kv i run my oher boat on were very small about 60g? what im tryin to get at is w/ the increase in torque hence larger prop would make up for the lower rpm? this is jus some planning so im open to all sugestions..

[bea5017]

90 views no posts?

[Brod]

I think your right about the high KV of outrunners.
Just did a bit of a search for a 23-2500kv one and the only one i could find is the Scorpion HK-2221-12 V2: 2580Kv 38A 400W .
The nearest one which is the the Scorpion HK-3026-1900: 1900Kv 80A 1400W
Which if your cat is not too big would make a good twin motor 4S boat.
Have a look at this page,;lots of info etc. on Scorpion motors.

http://www.micronradiocontrol.co.uk/scorpion_hk_app.html

Brod,,

[CornelP]

Well, I'm not an authority, but with 150A to spare on a 4S arrangement or dual 2S, you could get away with 2837ish outrunner, with 3650kv... or a similar one. These could be ok on 2S. The one I saw had 435W, just enough... I did not see (yet) an outrunner with a current above 50A (al least not on the sites I usually shop).
I just think it is still better to aim for high rpm's... but you have a point, it should be ok. I will be testing a new smaller prop on sunday on my 30"... on 4S and 6S (Feigao 10XL, so plenty of torque) and will get some ideas...

The motor I was looking at is a turborix 3500kv

[bea5017]

cornel

i was thinkin on runnin 2 2s packs in series for 4s so i was likin the HK-2221-12 V2: 2580Kv 38A 400W one, how ever it only goes on ttoe recomend up to 3s props which concerns me

brod

thx for the good link here is one i found http://www.b-p-p.com/product.php?pro...&cat=30&page=1

[Brod]

What is the proposed size of your boat?

Brod..

[domwilson]

There is a guy on this forum who knows about using outrunners in a FE boats. His name is Mitch Dillard. See post #8 on this thread... http://forums.offshoreelectrics.com/...ighlight=mitch

I'm sure he can come up with some recommendations.

[bea5017]

brod i am not exactly sure but i wanna keep it pretty small 26" max... i have 2 30c 5000mah packs which i would like to use for the proposed build. that is why i am tryin to figure out what motor would be the best on 4s1p or 2s2p so then i can scale some cat plans to fit... i have never experemented with outrunners so i dunno how big a hull they can push relative to size, this will be my first dual setup so this also does not help

[bea5017]

what bout this twin http://cgi.ebay.com/Motor-KV3800-Out...d=p3286.c0.m14 on 3sp2 or http://cgi.ebay.com/Heli-Brushless-m...d=p3286.c0.m14 on a 20-26 inch cat

[Brod]

I would say you really want to be looking for a decent 3000kv motor for 3S.
Those cheap deals which include the escs too beware!!
I would go for a Scorpion motor.
I fly a Minititan heli on 3S with a HK 2221 V2 Scorpion,gobs of power and comes down cool after about 8 mins.
Much cooler than the Align motors and inrunners..
Brod..

[bea5017]

those scorpion motors are looking promising... how big cat u think 2 http://www.micronradiocontrol.co.uk/...html#scphk2221 could push on 3s

[Brod]

I would think your 26" one would be ok with 2 motors if you keep the build light.
I would get the Scorpion motor with the builtin fan though,even though its a sealed hull,it all helps.
Brod,,

[Simon.O.]

I'll fire in my 2c worth.
I have designed and built hulls around a motor, I have built hulls to suit a given power system (motor-esc-pack) I have drawn hulls to suit what components I have here.

There comes a time when you need to choose what you really want and go for it from the "ground up"

I say this as I go round in circles choosing a Cat size to suit what I have. I have given up on that and have now commited to save enough coins to get what I need to build a boat complete.

If you have loads of components (motor-packs-esc-props) then you can pick and choose a hull. If you do not have gobs of parts to fit then it is best that you decide what you would really like and work (save) towards it.

I am !!

[bea5017]

simon $ is not really a prob jus tryin to get the best plan togther b4 i start buyin..

im now considering 2s2p 5000 mah 30c twin http://www.innov8tivedesigns.com/pro...roducts_id=205

on 24 inch hull. the motors are only 80 grams a piece so im havein trouble tryna find the best length ive nvr done a dual set up so this is another reason i am having a hard time

[bea5017]

kinda haven second thought bout the scratch build but cant find any 20-26 inch hull cept the ally cat and scat cat 26 if anybody has seen any other