50" Hydro Build

[Make-a-Wake]

Finally got some stuff in to actually start some work......missed the motor, delivery attempt was made and i was at work, wife and kids out

Well, this will give me a bit to do anyways............putting in the twin servo's, making the parallel connectors, adding bullets to the Big SF240hv

I will pick up the motor Monday and see if my custom made water cooling jacket will fit properly.............




.................................

[keithbradley]

I'll be following along on this one, I love the big boats!
My 50" mono should be here in a few days, I got the red, white, and blue one. These boats are made by Dragon Hobby, which I beleive are the same people that make the EKOS.

As far as running on 8s...I thought 9s was a little on the slow side honestly. I ran my 40" mono on 9s2p with a Neu 2215, and that was 1020kv. With a x457 prop it stayed cool (motor was VERY cool actually, usually came back in the 90's).
Have you considered running this on 10-12s? 9s is only going to put you at 25,000rpms with 780kv. I guess if you want to run a huge prop you may want to keep the rpms down, but otherwise let her rip.

Im looking forward to seeing how that HUGE new motor is going to do in this monster. It should move some water for sure!

[Make-a-Wake]

Thanks Keith.............. I planned on running it on 9s, that seemed to be the best config. for me batt wise especially as i have a bunch of 3s 40c 5000's. I'm gonna run two sets of 3 series packs for 9s2p. The motor specs actually say 30,000 rpms max on castles site............not sure how "true" that is but 9s should be right in a good zone. I have a 1460 i just got in, and the stock 78mm has been honed down to 66mm as well.

Yes.............i'm itchin' to see what this baby will do!!

[Make-a-Wake]

The Monster came...........!!

What a bruiser..............all 3 lbs. of it..........impressive in person.

Check out the pic next to a KB45(same size as Feigao 580L)...........

This is gonna be fun.................

[Jacked1]

WOW!!! That thing is HUGE! That boat is gonna scoot! You might be able to use one of these props!...

http://www.getaprop.com/content-product_info/product_id-7733/hung_shen_htp_3_propeller_12_dia.html

I might need to do a similar project for an excuse to get one of those motors! looks great man!

[keithbradley]

That thing is a monster but it still looks small in that hull!

[Make-a-Wake]

Thanks Jacked......!! I'm pumped!!!

Keith, it looks like a 380XL in a 1/12 for sure doesnt it!!

[madgadget]

Keith, it looks like a 380XL in a 1/12 for sure doesnt it!!
Today 08:26 PM

I don't know if I would go that far.I'll bet it sounds good regardless tho!

[Make-a-Wake]

Cooling jacket seems to have worked out well.............great pressure test!

Used O-rings from a Feigao 580L cooling jacket.............stretched 'em over and.............bam! Greased the groove and this sucker is on there.

Jacket is a piece of PVC coupler......60mm I.D.

[keithbradley]

Do you know for sure yet what you are going to do with the prop/flex shaft situation? I got my 50" mono today and it has the same 5mm shaft. I took it apart and it consists of a HUGE stuffing tube, a liner, then another liner inside of that, then the 5mm shaft. I have considered trying to turn down the end of the prop shaft (from the drive dog back)to 3/16" (its just barely too big for 3/16" props) and putting a 3/16" drive dog on it. Im not sure I really like this strut/stuffing tube/liner inside a liner setup though. I could just get a different strut and run a normal stuffing tube, might be further ahead.
Curious to see what you choose to do...

[Make-a-Wake]

So you got your Big'n in! Is it a decent boat? Mine has impressed me by the quality and so forth. Yea, the 3/16's barely "dont" fit...........i thought if turning mine down too, but then you have the threaded area...........how would all that work???? I think it would be better to bore out a drive dog and all the props you would use............if i do that i would take it to my local tool and die guy to do it within some tight tolerances so its all balanced and straight. For now, going with the stock setup............i have honed the prop down further to 63mm.

What do you think of my $2 jacket................?

[keithbradley]

So you got your Big'n in! Is it a decent boat? Mine has impressed me by the quality and so forth. Yea, the 3/16's barely "dont" fit...........i thought if turning mine down too, but then you have the threaded area...........how would all that work???? I think it would be better to bore out a drive dog and all the props you would use............if i do that i would take it to my local tool and die guy to do it within some tight tolerances so its all balanced and straight. For now, going with the stock setup............i have honed the prop down further to 63mm.

What do you think of my $2 jacket................?

Quite crafty on the jacket Looks like it should work well.

My plan with the flex was to turn down the shaft, then just run a die on the end and cut new threads to the size of a regular 3/16" prop shaft nut. The more I look at this thing though, the more I am leaning towards ripping it all out and putting a new flex, stuffing tube, and strut or stinger in it. The flex sticks out of the front of the stuffing tube a couple inches, then goes into that double layered liner. While Im sure this is fine at weedwacker RPMs, I think its going to whip around and self destruct at 30,000+ RPM. Also, the strut angle in the rear is not even close to neutral, and while its slotted, when you move it down to get it neutral, the hole doesnt line up. The slot should have been at an angle in order to line up. Again, with the stock motor (I saw a vid of one and trust me it was far from a rocket) the lift on the bow probably helps, but when I try to go fast I dont think I will be able to keep her in the water with that strut angle.
I hate to get this involved with the flex/tube/strut on a boat that already has hardware, but I think it has to be done. How is the strut angle on your hydro?

As far as the hull quality, the glass and gel work are actually pretty nice, and rudder is nice and thick/well machined. Its going to take a little bit of effort to get it water tight being a gasser, but I knew that going in.

I have to say Im a little envious in the power department. Ive got this dinky little 5692 to put in mine, which is seeming smaller by teh minute every time I see that picture of your castle!

[Make-a-Wake]

Post some Pics!!

My strut is very adjustable..................raises and lowers in about a 1.5" range, and can kick out or in a bit as well.

I cut my flex shaft off and left just enough out of the tube to fit it into the 8mm to 5mm coupler..............it didnt even need soldering..............already soldered far down the flex due to the squared off section that i lopped off.

So you feel the boat is fairly well built too...................that makes both of us, maybe others will start hot rodding these big ol' gassers too!

PICS!!! Inside and out too please.

[keithbradley]

Heres a few I took of the strut and inside...I can take more of the whole boat later. I didnt take too many cause I wasnt going to post them in your thread and clog it up with pics of my mono

[keithbradley]

Here are a few more, you can see how small that Leopard looks in there...

Its a deeper V than Ive ran in the past too.