Turnigy H2218 to small?

[jamespl]

I have just had 2 turnigy H2218 2500kv outrunners delivered and I was going to use them in a dragon saga twin as a replacement for the stock 380 motors. I don't have the boat yet but the motors look really small. My question is have I purchased the correct size motors for this hull?

[Diegoboy]

Your concern is in the length of the 2218 motors corrcect?

They are the same diameter as the stock motors, but are much shorter. I feel they should work. The boat is what, about 25" right?

[martin]

I assume your refering to the twin 820mm or 32" Dragon cat, If so their to small to give any speed over the original 380 2636kv motors. Martin.

[jamespl]

Yes, it's the ekos clone. I was hoping they would be the same size as the ones in the latest ekos. Looks like I will have to scrap them then!

[martin]

Those motors you have are only 450 size heli motors, You want something like a 500 size heli motor. Not sure youll find any where the kv your looking for in those though. Martin.

[jamespl]

I think the H3126 (500 size) outrunners will be too big. Could try the 2200kv versions that fightercat stocks.

[martin]

Yes the 500 outrunner motors are 37mm diam, I would think a 380 inrunner with the cooler on is 34-35mm diam. But those Venom outrunners look quite big as well. Martin.

[martin]

Those Venom outrunners are the same diam as the 450 size outrunner motors at 27.8mm diam & 42mm long. Id give the ones you have got a try, They will be a bit slower because of the lower kv but you could up the volts.

[martin]

The 450 motors that you have are 500w, Turnigy do a 450/500 600w that is the same diam as the ones you have & same diam as the Venom ones. Their also 42mm long the same as the Venom ones, But the closest ive seen kv on these is 2900kv.

[Simon.O.]

Outrunners in a Cat

Fwiw I run Heli motors in my bigger cat. 29-33" depending on how you measure it.
I have run 500 size 1600kv Turnigy's and now have a pair of 1800 (1900?) Typhoons in there.
They are run on 5S via 100 mystery type E-bay sec's
These are the motors i have run with a lot of success
http://www.hobbyking.com/hobbyking/s...dProduct=11181

These are the motors i now will be running.
http://www.hobbyking.com/hobbyking/s...idProduct=9258

This may help

[martin]

Their may be issues getting these 500 size motors in on the Dragon Saga cat because of their larger diameter of 37mm. Martin.

[Diesel6401]

I think the H3126 (500 size) outrunners will be too big. Could try the 2200kv versions that fightercat stocks.

I ran the 1600kv ones on 6s in a twin HOR 32". Motivated the hull really nice, and sound wicked. I ran CF40's but it will take more prop. I planned on CF45s but sold the hull before I could try them.

[jamespl]

I might try some leopard 2850 2950kv inrunners on 3s when I get some more pennies. I just thought those outrunners would be a cheap upgrade, guess not.

[Simon.O.]

I might try some leopard 2850 2950kv inrunners on 3s when I get some more pennies. I just thought those outrunners would be a cheap upgrade, guess not.

I try not to be a thread hog but I have to say this. Outrunners are great in boats.
Not all boats and not all applications, I have a good spread of OR and IR motors through the fleet and there are some that may change soon too.

IMO if you have a good air volume like a mono or Cat then an OR can be tried and sometimes be successful.
In general riggers are not good homes to OR motors but it can be done

If you have found some well priced cans to go in there then do it. It is all about learning and having fun. !

[martin]

Most of my 450 outrunners now i make a watercooled mounting plate which keeps temps down as im pushing the motors to over 42000rpm unloaded. Martin.