Delta Force Micro Hydro Build (Need Help with Power???)

[longballlumber]

Hey guys,

I just recently picked up one of THESE (Delta Force 16" Vortex Hydro)

I plan to pick up the following hardware from OSE...

Strut - http://www.offshoreelectrics.com/pro...prod=ose-80046
Rudder - http://www.offshoreelectrics.com/pro...prod=ose-80048
Turn Fin- http://www.offshoreelectrics.com/pro...prod=ose-80048

I already have the .125"/.130" flex cable, drive dog, and coupler here at home.

What I need is some advice on picking up a motor and motor mount. Which Leapord motor (and motor mount) would be best suited for this boat?

I am thinking that 3S will be the best way to go for performance and amp draw. As far as the controller, I have a spare on of THESE (Aquacraft Wildcat 50amp)

Soooo.... What is your suggestions for a motor????

Thanks
Mike

[ray schrauwen]

No need to overpower it. Do you prefer inrunner or outrunners? There are some inexpensive outrunners with many more watts to a comparable sized inrunner.

A similar motor to the mini-cat/tenshock hydro is sold at HK for about $62 but for that price you can get a nice Leopard inrunner from Steve for the same price and it's 4 poles instead of 2... LBP2845/3Y 2960KV 39A

[longballlumber]

Thanks for the reply Ray. I haven't done much with this little stuff, but it's always had my attention.

I like the idea of an inrunner so that I can water cool the can. Plus, I have the opinion the the RPM vs. Power curve tends to be better with the inrunners vs. the outrunners. However, that is simply an "eye test" meaning I don't have any techinal data to back up my claim. Will the 48mm length motor be OK or would the 2860 Lepord be a better fit for the application?

Later,
Mike

[marko500]

Mike I have one of these boats. Was powered by a Mega 1615/3 inrunner and it was pretty fast. I also used a Medusa inrunner in it but it was almost too fast. Don't remember the specs on the Medusa but it was a 28mm dia motor I believe. Power was a Turnigy 2650 3s lipo. And the esc was a Castle Barracuda 80. Motor mount is just an angled piece of aluminum type mount. HS81BB servo, Fuller's strut. It's a fun boat, I should probably dig it out and run it again.
Mark

[longballlumber]

Thanks for the reply Mark,

Do you recall what kind of Kv those motors were and what prop you were running?

[marko500]

The Mega is 3000kv, the Medusa was a little more then that. Might still have the box the Medusa came in, I'll see if I can find it. For props I ran an x427. x430 with the Mega, I'll see whats on the boat when I used the Medusa. If you need pics of how it's laid out inside I'll see if my son can snap some. Any measurements let me know.
I do remember with the Medusa it wanted to torque lift the one sponson, but a little weight in the sponson cured that.
Mark.

[ray schrauwen]

The 2860 is a bit heavier and bigger. Since it is only a 16" boat the 2845 will easily power it and not heat up much. Most of the RTR versions of a DF or Tenshock ony use a Max 300Watt 20mm x 40mm 2 pole motor so a 2845 is quite a bit heavier but, not too heavy. I'm not sure I would stuff a 2860 into a 16" hydro but, lemmie check out how one fits into my HK 17" pod racer hull (not built yet)... Kinda tight.

The Tenshock 3800Kv motor at hk is only 15mm x 30mm in size so, a Leopard 28mm x 45mm would be the largest I would go in this. the 2950kv is a nice rpm for 2S-3S and it's a Y wind that is a little easier on esc's also. Remember the shaft on Leopard 2845 and 2860 is 4mm in diameter

Thanks for the reply Ray. I haven't done much with this little stuff, but it's always had my attention.

I like the idea of an inrunner so that I can water cool the can. Plus, I have the opinion the the RPM vs. Power curve tends to be better with the inrunners vs. the outrunners. However, that is simply an "eye test" meaning I don't have any techinal data to back up my claim. Will the 48mm length motor be OK or would the 2860 Lepord be a better fit for the application?

Later,
Mike

[martin]

I also would go with the Leopard 2845-2960kv that Ray suggests, the 2860 will be to much in a 16" hull

[longballlumber]

Thanks Guys,

I appreciate the advice on the motor. I am going to order the other stuff along with a Leopard 2845-2960Kv tonight! Thanks for the heads up on the coupler. I made sure to get the 4mm shaft.

Later
Mike

[longballlumber]

Hey Guys,

I have received all of my goodies from OSE, and I think I made a mistake with the motor mount. First of all I ordered the Etti water cooled mount found here. It sets a little too tall for my liking and doesn’t give me enough adjustment before interfering with the cowling. I plan to reorder from OSE and get the same mount without water cooling.

I have already mounted the strut so my next step will be getting the rest of the components laid out to determine the correct CG. While I am waiting on my new motor mount I will be looking to get my rudder assembly located and mounted.

Question – Does anyone have a suggestion/recommendation on battery capacity for this little boat? Would 2200mah be enough or should I be looking for something bigger?

I will get some pictures up tonight or tomorrow.

Later,
Mike

[ray schrauwen]

I think 2200 is about the max but, I'm not sure. You would want to make sure the battery you choose fits and isn't too big.

[ray schrauwen]

These are smaller motors but, I just saw them on Castles web site. Pretty potent for a 20x40mm motor! http://www.castlecreations.com/products/0808.html

[longballlumber]

Boy you were right Ray. I picked up a 3S 2200 35c pack at my LHS and it's going to be a tought fit between the motor, battery, and contoller while still keeping the CG in the correct place. At this rate, I would have rather got a lower KV motor and went with two 2S packs side by side..

Oh well, I will get the other motor mount and try and make the 3S 2200 pack work.

Later,
Mike