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NTM
01-23-2008, 09:53 AM
Hi, I should have snapped more pictures as I built it, but I thought I'd throw a few pics up anyways.
I won't get a chance to run it for a few months yet, as our water's quite frozen around here !

The motor is a neu 1912-1y (830kv), esc is a hacker 77, batteries are a pair of 25c 10s 3700mah packs to be run in paralell, and the first prop on deck will be an octura 940/3. Once I get a few runs on it I'll switch to a detongued prather 235.

This is the closest it'll get to the water for a while. Hurry up spring !
http://img.photobucket.com/albums/v325/NTM95/IMG_1082.jpg

http://img.photobucket.com/albums/v325/NTM95/IMG_1085.jpg

http://img.photobucket.com/albums/v325/NTM95/IMG_1091.jpg

http://img.photobucket.com/albums/v325/NTM95/IMG_1090.jpg


I couldn't find squat for information while building this thing so I'll throw up a description of how I mounted the wing and cowl for others future reference.

If you look closely at the pics, you can see a deans female plug at the front, behind the cockpit, this is wired into the negative lead that runs to the esc. You just plug in the male jumper deans and it provides power to the esc and bec, an on/off switch basically.
There is a hole in the front of the cowling that engages that deans plug and there are neodynamium magnets epoxied in the cowling that line up with matching neo magnets epoxied in the hull, that are visible in the pics of the hull opened up.
This way there are no hold downs spoiling the look, it removes easily but stays put (the magnets are very strong) and the sub hatch (turbine exhaust) can be taped easily.

The idea was to be able to put the batteries in and tape up the hatch well ahead of time, and merely plug in the jumper, slip on the cowling and go once at the lake.


The wing is mounted with carbon rods that are epoxied through the deck of the boat, they extend right to the bottom of the hull for more strength and are epoxied there as well. They only stick above the deck of the boat 1/2" or so.
The wing uprights have holes drilled in their base that mate with the carbon dowels sticking out of the deck of the boat, a small hole is drilled horizontally through the wing upright and the dowel to allow a retaining pin to be slipped in. I just use small pieces of solder as I want them to shear easily in a blowover.

The horizontal wing I epoxied 10-32 du-bro brass inserts into. I then drilled the corresponding holes in the vertical uprights and retained the horizontal wing with 10-32 plastic bolts with small pieces of fuel tubing on each side.
I made small brackets to go on the plastic 10-32 bolt between the horizontal wing and vertical upright to attach the wing supports to. I drilled and tapped the strut mount for a pair of 4-40 cup style ball links. Made a couple of supports with 4-40 rod and clevises and there you go !
The wing is very secure under normal conditions but will seperate easily in a crash. Both the horizontal and vertical wings were injected with foam, so the wing assembly floats.

Cheers !

Nathan

SJFE
01-23-2008, 06:46 PM
WOW Really really really NICE :D

ReddyWatts
01-23-2008, 07:26 PM
Looks great!

Where did you purchase the hull?

NTM
01-23-2008, 08:23 PM
Thanks guys, the credit goes to h&m for building such a nice hull. There's no paint on it at all, only vinyl, the gel coat was flawless and the seams hardly noticeable.

I purchased the hull from Brian of Raptor RC. He had it sitting around for a while.

The next project I'm looking at is either a 50" expresscraft thunderbolt with twin neu 2215's or a mhz nomad xl with twin neu 1915-1y's. Lots of time to build during the winter here. Either one done semi scale with mtc arneson drives.

A couple pics of the thunderbolt, 50" long, 17" wide, 8 pounds for the bare hull:
http://img.photobucket.com/albums/v325/NTM95/Tr50334.jpg
http://img.photobucket.com/albums/v325/NTM95/bp05.jpg

A couple pics of the nomad xl,48" long, 4.5 pounds bare:
http://img.photobucket.com/albums/v325/NTM95/Isiklar20small2034.jpg
http://img.photobucket.com/albums/v325/NTM95/ElectroCat_MTC1_x.jpg

I'm not sure which one to do, I'm kind of leaning towards the nomad, because it has scale style sponsons with no ride pad. Takes more power to move at a given speed but it'll handle rougher water and be less prone to blowing over, I've got the power to burn.
Even though it's smaller it may handle higher speeds better that the thunderbolt will, the thunderbolt was designed as a gas hull and is out of it's element above 65 mph.
The nomad's a little more cost effective too.
But the thunderbolt's pretty cool looking and I can just imagine the sound of twin neu 2215's...


Regards,
Nathan

Mich. Maniac
01-23-2008, 08:59 PM
WOW Really really really NICE :D

:iagree: Nice paint booth there too. I just have one question why is it called twin wing when it only has one?

Doby
01-23-2008, 09:12 PM
The wings have to do with the 2 cuttouts on each side in the hull, visible next to each side of the motor,,,,I think !

Diegoboy
01-23-2008, 09:15 PM
see pic...

Mich. Maniac
01-23-2008, 09:24 PM
Yeah, wow, that IS really really nice. wow. thanks for pointing that out guys. How slick!

NTM
01-24-2008, 02:03 AM
Yeah the hull was actually kind of unsuccesful in 1994 when it was raced.
The design principle is that the leading wing lifts and creates a low pressure area on the top off the trailing wing, which in turn lifts the back end. It was supposed to kind of aerodynamicaly stabillize the hull and cross the line between a boat and a low flying aircraft.
The problem was that the drivers were scared of it because it had no "feel" to it at speed, because, well, it was flying. I'd be scared of flying an aircraft that had no control surfaces too !
It was however, fast.

Regards,
Nathan