Delta Force Vortex Hydro, Second Try

[spicedcrab]

as some of you know, i lost my 1st vortex on the 4th run. i just started the build on the second hull that i got from steve here at OSE. i will try and take more pictures this time as i go along for anyone who is interested. so far i got the motor mount and stuffing tube and strut mounted. i used JB weld for the motor mount and also were the stuffing tube goes through the hull. i 1st cleaned the area's to be epoxied with alcohol. i scuffed the stuffing tube were it goes through the hull and made a gentle bend all the way. i used rtv sealant on the screws that mount on the transom.

[smm_cbf]

just courious, how did you lose your other one?

[jeff180]

I like that strut. How much was the hull and strut?

[ace028]

Looks cool, if it were me I would have used epoxy to mount your stuff instead of jb weld as it looks a little better, and is cheaper. I want to build one of these soon, gotta convince the wife that I need one lol.

[spicedcrab]

smm; i had it overpowered and had hull failure, here is the thread, http://forums.offshoreelectrics.com/...ead.php?t=3264

jeff: the hull and strut both came from OSE, its the speedmaster 21 strut for $29 and hull for $85

ace; you dont need to convince the wife............ do as i am doing on this build.......... give the boat to her for MOTHERS DAY! she will ask you to build it and test it for her also!

[ace028]

ace; you dont need to convince the wife............ do as i am doing on this build.......... give the boat to her for MOTHERS DAY! she will ask you to build it and test it for her also![/QUOTE]

Thats a great idea lol

[spicedcrab]

i started putting some carbon fiber tubing in to strengthen the bottom and motor.

[Heath M]

Looks good,
don't forget to add flotation to in the sponsons and anywhere else you can fit it...

[10gauge]

Spicedcrab, I use carbon plates from ACP-Composites to strengthen the thin motor mount area. By the way where was your COG in relation to the sponson on your first build - It seemed to run very nicely on the video.

I am almost done building a DF22 as well and the COG is 1.25" behind the sponson. I'll be running a 8L-3072kv, 3S/4500mAh/30C LiPo, Hydra 120 ESC, and x435 to start.

[spicedcrab]

my COG was about 1 3/4" behind the sponson. im still deciding on what motor and what voltage i will put into this one. my guess is that your 8L and 3 cell will be a good setup as well as your COG (sometimes the boat will go under when you start to move and you will have to restart, but ok after you get it moving) after you start stepping up the props while you test and check temps, i think you will get to about an X638.

its a fun boat to build isnt it, good luck with yours as well.

[spicedcrab]

i just noticed that when the top and bottom of the hull was made, they did not put a fiberglass seem up in the sponsons, thats were my last hull split, so i am going to try and come up with a way to reinforce it up there. 1st thought coming to mind is smearing a very thin layer of jb weld all over inside, then taking some braided fishing line and pushing it up in there to stick to the epoxy so there will be fibers running all around to strengthen it. then use a small amount of expanding foam before the epoxy sets to be sure that the line gets smashed against the epoxy.

[10gauge]

. . . I am waiting for the epoxy to dry on the motor mount... It appears that my COG is actually 1.5in fully loaded. For this hydro, I really wanted to use a 1P Lipo that was rated at least 4000mAh/30C. I looked at many different brands and the most powerful one that barely fits into this hull, (sideways in the bow area), is the Elite 3S/4500/30C LiPo from rclipos.com - Pat is honest and trustworthy. It should give 135A continuous, enough to drive a Neu 1509.

[10gauge]

Wow, I thought it would have split somewhere along the drive line. I'll have to check out my hull too and see how strong the seem is.

[spicedcrab]

i finished the carbon tubes used for bracing the bottom. i smeared a very thin layer of JB weld (about 1/4 ounce total) into the front of the sponsons to give them a coating for the braided fishing line to stick to, i then added a bunch of the fishing line inside and pushed it in with a wire clothes hanger so that it was in contact with with all the side walls acting as fiber would from fiberglass. i then used 2 part foam and filled the front of the sponsons, right as i did that i took one of my lipo's that i will be using (TP 3300 4 cell) wrapped in plastic and put it in the sponson so that the foam would only go were i want it and not in the way of the battery that will go in later.

i believe that this will be enough to hold the hull together just in case it may have been week up there, for insurance. (it may not even be necessary, i just want to be sure) and it didnt take long for this step anyway.

some more pics........

[crazzy maxx]

that sux how the old one blew apart
nice work with this one! keep it going