ML Boatworks, PX335 O/B Tunnel, 33.75" FE , frame up design like the PX/NX300 kits!

[cybercrxt]

See how the stumble pads stay bonded to the center section, but not the sponson at this time:



Now its time to bond the sponson top decks: This is the most critical part of the build besides the center section top deck. If you have a twist in the sponson after the top deck is on..the twist stays!


In preparation for the top deck bonding, you will again want to put down a riser on the flat board. This will allow you to clamp down your sponsons while the top deck sheeting drys, ensuring the sponsons do not get twist while you tape the decks on!



Epoxy the decks on, tape them to the sponsons, and put them on the riser, and gently clamp in areas that do not affect the top deck.



Once the sponson decks are dry, using your sur form, and sanding block and clean up all the outside edges:

[cybercrxt]

add epoxy on the bonding area between the center section, clamp the 3 parts, double check with your 90degree angle to be sure the sponsons to tunnel are at 90 degrees, make sure your ride surfaces lay nice and flat on the building board..from the sponson transom, to around 11" or so forward. If you have more than maybe 1/32" gap, I would really look over your kit and see what is causing that before doing the final bonding of the 3 parts.

Here is the hull after clamps removed (I used the same clamping technique as you saw a few posts above while dry fitting the 3 parts):


And finally bond your air brakes:


Another shot of the finished product. Now you will need to bead seal with epoxy and silica all the way around the bonding area of the sponsons to the center section. Once that has dryed slightly, you can brush the rest of the hull with epoxy sealing coats. I will have pics of that this week when I add the bead seal and epoxy. So far, only 7-8 hours have been spent on this build..not to bad! Keep an eye on the thread. For now, this is all!

[cybercrxt]

Woke up early and worked on seam sealing the critical areas. You can see from the pics were I taped off so the West systems mixed with Silica would be easier to focus in the corners. This step is worth the tape and time as it makes for a much cleaner bead.









The thickened mixture of West Systems 105 w/ 205 hardener, and 406 Silica

[cybercrxt]

You can kind of see the bead in the seams. When I get home today, I will scuff the bead (since I was not home around an hour after applying the silica mix) and apply the first coat of west systems 105/ 205 epoxy on the exterior. You can also see I did however epoxy the inside of the radio box

[cybercrxt]

Starting to get things done on the tunnel. Hull is cleared, cowling was in basecoat in the pic, its now clearcoated, however the satin black is awesome looking! Should have done the whole boat like that. Neu 1521 1.5d motor, gonna just use my old Hydra 240 as its already set up with this motor and has bullets on it already. May switch to an Ice controller later. Getting a lot done during this long weekend! Enjoy, Mike

[cybercrxt]

Some pics of the finished boat. Neu 1521 1.5d, Castle Ice ESC, OS lower, Hyperion 4s 45c 3300mah packs:

[Brushless55]

I dig it!
how big of packs will fit this hull?
thanks

[cybercrxt]

Hey Brushless,

I am currently doing (2) 4s 3300mah 45c hyperions, however I could see getting (2) 4s 4200mah 45c packs, possibly two 5000mah packs, or if you needed to go 5s or 6s lipo I could see possibly getting (2) 6s 3300mah packs in there..Its gonna depend on your esc setup in all honesty. 6600mah is a gracious plenty in this hull tho, anything bigger is just not really needed. Mike

PS, I am working on a 39.5" hull called the QX400 as well...that will have a LOT of room if you need more!

[Grazacind]

Mike the boat looks great. I am taking the QS370 out SAW racing this weekend.

I will have to chat about a drop sponson lauterbech kit one of these days

Cheers mate and hope to see you down this way one day.

[cybercrxt]

Andrew, Let me know how it goes! What motor setup will you be using?

[mattmak]

such a nice boat. want.

[Grazacind]

Andrew, Let me know how it goes! What motor setup will you be using?

Mike I will be using a Castle 1520 1600kv on 6s then moving up to a 1518 1800kv on 6s.

See how it goes from there.

[Brushless55]

I've got a 1527 1D that could rock this on 4s I think

[cybercrxt]

Andrew, those are good motor choices. Brushless, im sure that will get the job done...with ease...., but that motor, even only at 4s power would be stout on the 39.5" QX400 i am building right now.

[cybercrxt]

I thought some of you might like this. For the first time ever, all 4 size tunnels next to each other, from left to right, GS480, QX400, PX335, PX/NX300: