Spirit of Texas Drag Hydro

[drwayne]

Introducing my December 2012+ build.

40" Drag Hydro twin engine, 12S1P

Since 1975, when I would cycle my dragster 90mins from home to watch fire breathing blown V8 Hydros race around buoys on the big river, Ive been obsessed by power boats.
Awed to see drag hydros perform.. Youtube or live, they're a true heart pumper !

A colleague in Qld, Au took the challenge to build a 40" version of this hull
Diecast model here http://www.diecast.org/diecast98/htm.../reviewpix.htm



and came back with this




more to follow.
DocW

[drwayne]

2 x1/4 struts 78mm between centers, center mount extended rudder


shaft and motor placed for positions relative for cutouts


cutouts marked and in process of cutting

[Eyekandyboats]

man! that is going to be one cool build! good luck, ill be watching this!

[lenny]

[drwayne]

Shaft entry done
Motors positioned for mount tacking with 15 min epoxy
Itchy "Fairy" dust sprinkles everywhere


Outers positioned ready for tacking


slurry of 15min and floor sweepings for tacking down


the job done .. side rails to be laminated in CF..

[785boats]

I Love it.
What a sweet ride.

[drwayne]

I have Leo 5692/730 on 12S1P for this build.
The engine mounts can have the motor plate exchanged to suit a pair Neu 1527/1D(2300) 25mm hole centers .. it'll swap them over and run on 6S2P shared, once ride and attitude is all sorted .

[MrUnlimited]

Looks great! Are you building this for SAW?

[nata2run]

I'm sure ill hear this one in my bedroom when you let it loose, you done yet?? Ready for maiden?

[drwayne]

I build for fun, fast fun.
SAW depends on whether this hull ( 2nd? from mold ).. is stable at the speeds intended.
Stay tuned !

@Kent. You'll hear this spool up from your place, mate


3mm copper rails as charge carriers on the cap bank... soon to be covered in epoxy then heat shrink'ed.

[jcald2000]

Wow, nice Doc, you too are going to see data dumps like mine.
Can't wait to see it run!

[Richie the shipwright]

Someone has sticky fingers... Groovy doc. A couple of Conolly v8's would look extremely sweet in that puppy too... and sound KILLER!. Awsome, can't wait to see it. Totally my kind of crazy. By the way nice soldering...... (but your glasswork sucks!!! Floor sweepings!!!!?? Really???? DOC....WE GOTTA TALK.... he he he ). :-)

[drwayne]

Someone has sticky fingers... Groovy doc. A couple of Conolly v8's would look extremely sweet in that puppy too... and sound KILLER!. Awsome, can't wait to see it. Totally my kind of crazy. By the way nice soldering...... (but your glasswork sucks!!! Floor sweepings!!!!?? Really???? DOC....WE GOTTA TALK.... he he he ). :-)

The smallest Conley V8 now is a 6.09cu in (110cc) monster..the boat would need be 1/4 to fit it in !
This hull is a bees whisker under 1/6 scale
hahaha yeah, I did research Conleys a little ..... :)

This will have a different but equally exciting tone from it's twin 'big blocks' howling down the straight !

Floor sweepings.. an amalgam of Carbon and kevlar offcuts all masticated to form a sticky mass.. beats 5 min epoxy .. wont release if it gets warm. !!!
Thanks for the compliment ( I think )

[Richie the shipwright]

Ok.... floor sweepings....any SAWdust in there?? I hear that makes em go faster...? Deffinately going to scare a few children and scalp a few carp.... ( the boat dude... Not your glasswork..)

[Chrisg81983]

Pretty cool doc...

[drwayne]

Spent some time with turn fin mount.... mount is linearly adjustable underhull... fin adjustable linearly on mount.
Due the counter rotating props, Im not yet sure on best position for cog..the props will help raise the rear, so a cog adjust may be needed with a turn fin movement to suit.
Allows option of 1.25" centers behind sponson transom to 4" \_|
Ive had twins with props this close before( nitro and same rotation ).. opposing spin here will introduce different lift/thrust kinetics... planning ahead for ride changes.

[JCAustralia]

looking forward to see the vid doc : )

[drwayne]

Thanks to all comments.... it's interesting to build the first of a genre !

@Richie.. it's the adult aged kids who scare easy ! ...
and the turn fin will likely fillet fish quicker than John West ! hahaha

@JC .. yeah, for sure .. there's clowns out there panting for footage+gps already !

Waiting for cowl .. probably 7-10 days ..
Still plenty to do here...
esc mounts --- water tubes --- external safety loop ( mandatory in Au Assoc .. seriously you're a fool without one ) --- battery straps --

a boat stand !.. that's an idea !

umm
already laminated Cf onto side ply walls ,but was camera shy ..
already poured 16Oz/600ml ( when expanded ) of 2pak foam into the nose cones for strength... and poked pool noodles in as well.

11pm here.. time for a throat lubricant !
adieu

[srislash]

1/6th scale? There goes the Parma "Hemi".Any plans of scale like replication Doc? BTW,this should be a beast.

[drwayne]

@srislash.. it's only 40" long, mate ....and barely space to squeeze in the needed go-hard gear .. !
The cowl will be a concern for scale, but I trust the epoxyman to produce something admirable .
Im sure these hulls will be avail for sale once the build is finished

I do plan ( at this point ) to finish this as per the photo at bottom .

Parma Hemi ? for scale there's plenty blown V8 replicas in this size ( do they float ?? )

A beast or Monster ?.. water trials will tell !

W

667.jpg

[srislash]

There are some Doc,I found this one http://www.ebay.ca/itm/FORD-CAMMER-D...1#ht_500wt_923

A drag boat is something I have been dying to build but have not found anything suitable(until now).This hull looks awesome so I hope they will be available.

[drwayne]

There are some Doc,I found this one http://www.ebay.ca/itm/FORD-CAMMER-D...1#ht_500wt_923

A drag boat is something I have been dying to build but have not found anything suitable(until now).This hull looks awesome so I hope they will be available.

Err ahh that's a lot of breakage when it rolls over!
Sure ideal for on the shelf.
Cool, that seller is an easy cruise away. Thx the link.

Hahaha just checked, already have that, motor on loungeroom shelf !
Mine from another autoparts in Au. Very 'plastic' B(

[srislash]

Err ahh that's a lot of breakage when it rolls over!
Sure ideal for on the shelf.
Cool, that seller is an easy cruise away. Thx the link.

Ooh yeah,the breakage! Definitely have to have a sport mode option for cruising the scale look.

[drwayne]

[srislash]

That didn't take you long

[drwayne]

Err ahh that's a lot of breakage when it rolls over!
Sure ideal for on the shelf.
Cool, that seller is an easy cruise away. Thx the link.

Hahaha just checked, already have that, motor on loungeroom shelf !
Mine from another autoparts in Au. Very 'plastic' B(

That didn't take you long

hahaha

[srislash]

hahaha

Sorry bud,guess I kinda missed that tidbit.

[Heaving Earth]

I'm curious about a turn fin. This is a drag boat for going in str8 line? Do they need turn fins to keep str8? Just curious.... Looks cool so far

[drwayne]

@Srislash .. no probs, m8

Fin can be removed if/when this heads to SAW.
Wont need it for str8 runs, the CR props will oppose each other thus no prop steer !
Will need a fin for oval racing, though.. to hold in corners..

However, full size have turn fins for str8 line stability. see below


thanks to photographer (name?).

[srislash]

That is a good pic.It needs to be on a wall.