RC_Bob

Hello Everyone.
Just thought I'd start a thread w/ my progress of my aeromarine shadow sport 40 project.
The tubing is TEMPORARILY held by hot glue for now to find a good position.
The flexshaft may have to be trimmed down a little bit.
The motor will be held by a horizontal mount(you can kind of see it in the bottom right corner of one of the pics).


Any suggestions/comments are welcome!

ryan_t888

I'm interested.

Which motor, cells are planned?

Ryan

animalnut

I could be wrong but is this a sub surface drive on a three point hydro if so that tube is way to steep and the prop is way to deep but like I said I could be wrong[sm=confused.gif]

ryan_t888

Hydros are all surface drive.

Ryan

Raydee

My Feedback: (3)

I am not a big fan of the Strudder setup, but to each his own. I am about to paint my Sport 40 soon, hopefully it will be on the water before the summer hits. What are you planning for electronics in yours. Those hulls are pretty big and will need some power to get them up and going.

RC_Bob

I plan to use a hydra 120, 10XL, and 14 cells. The prop in the pic is an x440.

Thanks for the tip about the surface drive. How high/low should the strut be then?

ryan_t888

That setup will be weak in the power department.

Ryan

RC_Bob

What can I do to improve it? More cells? Bigger prop?

CadillacDTS2001

hydra 240 on 18 cells with a lehner 2280/8

RC_Bob

wow, sounds like a nice hi-amp set-up.

sorry taylor but I currently don't have the cash for that combo right now.[sm=frown.gif]

CadillacDTS2001

not really a hi amp setup. you would get away with a hydra 120 ... or a CC80 if you had to.
Lehner 2250's will run on a hacker 77Aesc up to 8s lipo with out a problem.

RC_Bob

Thanks taylor.

I'll think about that set up, but what about the one that I currently have right now? Will it pull out enough power(for a 37 inch sport 40)? If not what part of it can I improve for more power?

ryan_t888

The cheaper route

Turnigy HV ESC
6s LiPo
KB-45 9XL 1400kv (OSE) or 12L - 1400kv (HC)

all from Hobby City

Ryan

CadillacDTS2001

^ what he said.
also if you want a cheap lipo. get the ZIPPY brandname ones from untied hobby. they are Chinese ... yeah .. but they have a 90 day warranty against puffing and such

RC_Bob

Thanks ryan, that's just what I've been looking for

But what prop size would be good for that combo?
Also what about using Nimh for that combo?

ryan_t888

Prop depends on which motor you choose. Most likely starting at low 40's and working your way up to mid-high 40's. (mm)

18-20 NiMh cell would be the minimum requirement. I'd look away from NiMh cells especially when you can get lipo for nearly the same price as good NiMh cells.

Here:
http://www.hobbycity.com/hobbycity/s...idProduct=6350

At 60 bucks a piece, you would need 2 wired in series for 6s. Only 120 bucks US for 22.2v. How much would you pay for 22v worth of good NiMh cells?

3 month guarantee
20C discharge good for 80A which is what a KB-45 motor would draw.
Lighter
Faster
All around Better

Ryan

SV27dayton

Man that is outstanding. I think we are looking at the end of nimh here.

RC_Bob

Alright, I'll look toward the lipos a bit more.

But first can someone give me a brief lesson of taking care of them and using them(cuz I've been using nimh all this time).
Also name a good and cheap charger for 6s[sm=rolleyes.gif]

CadillacDTS2001

don't run your KB on a 1P setup. they ARE amp hogs and WILL hurt your cells.
especially since these are only 20C cells. I would be very weary of doing this

RC_Bob

I'm sorry, I meant 3s charger, not 6s charger.

What does the 1P mean? One pack?

RC_Bob

Aw whatever.

Well I just tried out the boat today and I got to say it's actually pretty good. Tops were around 45 mph. All temps were really good after running for one minute.

I just remembered that my mount can use KB45 motors and I might as well use one.
What do you guys think about swapping the 10xl for a kb45 1700kv?(and using the same set up stuff; 14 cells, hydra 120, and 40-42 mm prop)

ryan_t888

Bigger Prop. You may be able to spin something close or over 50mm. Start with the 42mm prop and check temps as you increase every 2mm in prop sizes. No temps should exceed 140F, I aim for less than 130F in race setups.

Ryan

RC_Bob

Alrighty, thanks for the tip.

What about amps with the KB45 I mentioned? You think a hydra 120 can take it?

ryan_t888

Yes, just watch heat carefully.

Ryan

RC_Bob

Tried out the kb45XL today and got some good and bad stuff.
Speed was really good. 45-50 with:
hydra 120
45mm
14 cells(intellect 3600s)
kb45xl 1700kv

All temps were below 140 F(everything except the batteries were a pinch warm)
I'll try a 48mm soon.

But for some reason the connectors that connected the esc to the batteries burned up and melted the tamiya connectors(I used adapters: tamiya to deans)
Could this be because of short circuit?(like probably some water got on the connectors?