4 prop expresscraft 60inch

[bedrock]

Hi guys

A few pic's of my new 60Inch Expresscraft SupercatPlus link to first bench test

http://www.youtube.com/watch?v=C2hOUWP1zDs

Set-up

Hull - Expresscraft - Supercat 60 inch
4 - Scorpion 4035 800KV Outrunners
4 - Castle Ice HV 160's
4 - Props - Octura - X465
12S Hyperion G3 45C

Have just finished Build -
Thanks to -
Andym - props's
Ark RC Australia - Motors/ESC's
Hobby Depot - Hull/Hardware

Hope to get this in the water in the next week - will post some video - Have HD Go-pro Camera on board

[JMSCARD]

I'm excited! So you are running 12s1p on each scorpion? and with large props too.... this should go like stink! definately get us some video.... even Randy "Rearwheelin" Duke would give you a nod' of the cap on this one... lol....Very Nice Setup... I am couning up to see "Ballpark" what this setup would run.... eeeshhhh

8 X 6s G3 45c hyperions= $ 2160
4 X Castle esc's= $1000
4 X Scorpion 4035's= $756
4 X Andy Brown props= $450

Ouch... this isn't a cheap build... Thats well over $4000 before you even start looking at Hull/Hardware/Flexes/Cooling components, etc., etc....

Nice Setup....

[dasboata]

Nice build 4 props $450 is that correct I need to raise my prices LOL

[domp444]

Wow! That is beautiful. I can't wait to see it run.

[kjohnsiii]

Nice boat! I cant wait to see what it does on the water.

[JMSCARD]

Nice build 4 props $450 is that correct I need to raise my prices LOL

I was guesstimating...lol.. this isn't my build I was just adding it up... if they are andy brown props are they "done up" i assumed...

[Brushless01]

Dont you also have one of those hulls with four castle motors ?

[Doby]

I think theres still room for two more motors.......

[bill34207]

I gotta stick around to see how this one comes out. It's gotta be fast. :bowdown:

[Stephavee]

that a crazy cat man... shut those nitro boats down....and make em cry!

[RIPFENCE]

ridiculous build..awesome :eek:

[bill34207]

that a crazy cat man... shut those nitro boats down....and make em cry!

Chances are they'd want to incorporate something into the rules requiring a de-tune on electrics with an "unfair advantage, in the spirit of sportsmanship".
Heck, my 50" twin can give a glow or gas a good run for it's money.

[Brushless55]

Unreal! :w00t:

[rearwheelin]

I think the a quad drive just went big time !!!!!!............Careful getting on the throttle to fast !

[bedrock]

Thanks Guys

Dasboata - The props were done here in Australia by AndyM - fantastic job

Brushless01 - I have a MHZ Iceberg running 2-2215 2Y's

rearwheelin - thanks mate - I was inspired by your build - cant wait to get this in the water!!!

I have 4 Castle 2028 780KV Motors on order will put a couple in this hull if the Scorpion's dont work out - Having some custom Water Jackets made as we speak

Thanks
Dean

[forescott]

Why soo much angle on the top 2 outrunners?

[RIPFENCE]

Thanks Guys

Dasboata - The props were done here in Australia by AndyM - fantastic job

Brushless01 - I have a MHZ Iceberg running 2-2215 2Y's

rearwheelin - thanks mate - I was inspired by your build - cant wait to get this in the water!!!

I have 4 Castle 2028 780KV Motors on order will put a couple in this hull if the Scorpion's dont work out - Having some custom Water Jackets made as we speak

Thanks
Dean

4 2028 motors for 40 hp are you kidding me?!?!?! hahaahhaa plan on water skiing or something? holy %#$#%#^#&#%^# :laugh:

[RIPFENCE]

the on ly thing that could be more insane is a 92 inch cat with 4 neu 2230's just go for the 2028's because i need to see it haahaha..

[RIPFENCE]

one more thing..i f you do not end up needing all 4 castle motors and jackets pm me because i am looking to use one..thanks...i cannot wait to see this thing break the sound barrier

[milfiebre]

This thing is bad a#% !

[Joe Ford]

Thanks Guys

Dasboata - The props were done here in Australia by AndyM - fantastic job

Brushless01 - I have a MHZ Iceberg running 2-2215 2Y's

rearwheelin - thanks mate - I was inspired by your build - cant wait to get this in the water!!!

I have 4 Castle 2028 780KV Motors on order will put a couple in this hull if the Scorpion's dont work out - Having some custom Water Jackets made as we speak

Thanks
Dean

LOL so you were the one who ordered 4 of them. I was wondering what they were going in (should you use them that is ;) )...glad to see they're being put to good use. Fellow speed freak myself. Can't wait to see the end result!

[rearwheelin]

Be very carfull when punching the throttle , even at speeds around 60mph mine will nose up and catch air ! It is a steady increase that will keep you on the water. I have blown mine over at over 70 and twice at 50 mph all because of hitting the throttle to hard. I dont think you will need water jackets but the wieght will be benificial. I am guessing your speeds to be in the 70's with the 800 kv motors. You have soo much power though. Everything should run pleanty cool ! :beerchug: P.S. I would thrust with your struts. I use Octura thrust washers and leave a gap about the thickness of a thumb nail. Thrusting with my motors caused alot of lift on the back end and made mine handle wierd. My opinion when building a boat that thrusts with motors has to be planed so that the motors angle in the hull is as the direction of thrust..... Set up looks nice and clean ,Good job !

[JMSCARD]

Randy I didn't know they made water jackets for outrunners? :) I think you were thinking water cooled motor mounts.... But you are right about the super sick setup and I bet those quads can put out some serious bow lifting thrust... Ha ha... Had to pick on ya about the water jacket thing...

[H2OCamel]

wow that is one clean looking build! Can't wait to see it run! Make me sad my 54in super hawaii never made it to the states. I wanted to do a four engine model of the real thing. post video!

[rearwheelin]

Randy I didn't know they made water jackets for outrunners? :) I think you were thinking water cooled motor mounts.... But you are right about the super sick setup and I bet those quads can put out some serious bow lifting thrust... Ha ha... Had to pick on ya about the water jacket thing...lol....Nooooo........Bedrock was talking about his new Castle motors I was refrencing to....dont u know they can be water cooled ! Its really messy though..................:sinking-guy:

[JMSCARD]

lol....Nooooo........Bedrock was talking about his new Castle motors I was refrencing to....dont u know they can be water cooled ! Its really messy though..................:sinking-guy:

oh gotcha...lol.... the outrunners are around 800kv too so I jumped to conclusions... ha ha.... I haven't seen you run an outrunner in any of your boats so I didn't know if you recognized it... :sinking-guy: my bad... :beerchug:

[Rich]

I am grabbing a seat for this one . . .

[keithbradley]

Very cool build Dean. Its been a while since I have seen you around here...looks like you have been busy!

[bedrock]

Thanks Keith

Yep I hope she goes fast - its been raining here for a few day's so I have not had a chance to test

If not I will replace motors with the New Castle 2028 motors 780 KV'S that i have on order from Castle - I am having Water jacket's made for these as we speek
I'm sure this will move this hull!!!

Dean

[ls1fst98]

this thing is nuts!!!! i cant wait to see it on the water!

[ScarabChris]

Excellent! I love out of the ordinary boats.

[ron1950]

after watching your vid i see u have a fleet of giant boats...must grow em big in VC

[calcagno45]

Very nice choice on electric components! Top of the line is the way to go!

[ojb]

cant wait to see it go top job

[rearwheelin]

Your week is up......video please !:bounce:

[bedrock]

Randy

Have not got this baby out yet - been windy....... busy at work

will try this week... - Hope she goes - got no idea what speed to expect??

Dean

[andym]

Come on Dean, enough teasing mate. Just be careful when you get the dog to ski behind it !!

[derektheshop]

wow unbelievable great build

[rearwheelin]

Randy

Have not got this baby out yet - been windy....... busy at work

will try this week... - Hope she goes - got no idea what speed to expect??

Dean
I think she should be in the 70 mph range, but she is going to want to move there super fast so watch for a light front end ! Even if your moving at 50 mph + and then hammer it she can get light and a big boat like that can pack some uplift and go over......I have done it a few times trying to pop wheelies ! Its going to get crazy fast !!!!!!!!!!!!!! P.S. You will need to watch the turns when accelerating through them because the thrust footprint on the transom is wide and the boat has a tendancy to straiten out so don't push it to hard close to a bank ! Late apex then throttle up 3/4 into the turn and watch her fly !

[Old School]

Bringing an old thread back to life. My son recently purchased this bare hull on eBay and it arrived today. Considering the phases this hull has been through with its checkered history, the hull was in surprisingly good condition with nothing major wrong with it. No longer did it have its multiple Scorpion motors or its dual EDF propulsion units. The hull was received bare.

Odd that the hull did not initially receive a gasser motor as the original purchaser fitted the four Scorpions, however, even with no evidence that rails had been fitted, the hull interior looked like a gasser had been used. The interior looks to be greasy as if fuel and oil stained.

As received the upper half of the hull was painted red. Upon removal from its packing the colour turned out to be a painted matte red vinyl overlay and was peeled off extremely easily revealing a hull in surprisingly good condition.

I set about removing some of the blobs of 5 minute epoxy and RTV sealant used to fill in the holes originally drilled for the four struts. It is intended to inlay the hull with a carbon fibre inlay as the hull is surprisingly thin for such a large boat. Remember this is a 60" hull.

My son has sourced Speedmaster 1/4" nitro stingers for it. The plan is to fit the two spare Turnigy (Proteus) T20 motors that I have as well as the 1/4" flexshafts and motor mounts originally purchased for a stillborn project. I have seen a You-Tube video of a similar Expresscraft 60" hull with the same two stingers and performance was more than acceptable. The hull in the video did bounce around a lot like a cork bobbbing on the water so ballast weight with multiple batteries is obviously needed.

I took a couple of images to give an idea of the hull in its current configuration. This, no doubt, will be a long term project. It is good to see that old boats never die.


Edit: I believe that the hull is now called an Expresscaft Supercat.

http://expresscraft.com/supercat.htm

Edit 2: this is the same style hull with different canopy

https://www.youtube.com/watch?v=cCOgKRUVRKo

[Beaux]

Bada$$ boat. Where did you find the lock down pins for the cowl.?

[Old School]

Bada$$ boat. Where did you find the lock down pins for the cowl.?

The pins were supplied with the hull so unfortunately I have no idea where they were sourced.

[CraigP]

Wow, never seen someone run an RC boat so close to kids in water... I bet I’m not the only one questioning that decision! But a beautiful boat and twin screws look more than enough to get that lady going!

[Old School]

Craig,
there is a part 1 video on his You-Tube site where he goes even closer to the children at even faster speeds before turning about. Nice boat but definately unsafe operating practices. My son advises the motors and ESC on the boat are extremely expensive offerings from Europe. The part 1 video description states the hull weighs in at 36 lb so I am surprised how bouyant the hull is. It seems too light.

[hughb]

Bada$$ boat. Where did you find the lock down pins for the cowl.?

http://www.rcboatbitz.com/index.php?main_page=product_info&cPath=6&products_id=1205

[Old School]

It is amazing what a little elbow grease can achieve. When received yesterday the interior was very dirty. An hour of scrubbing, removing loose 5-minute epoxy and RTV sealant and the surface is now much better.

The port side sponson tip had about 1/4" missing so this has been built up. The port side forward corner of the hatch cutout had a 1 cm crack. I sanded back through the gelcoat to the base fibreglass and the crack was still evident, so the area was ground out and now filled. I cannot detect the crack going all the way through the skin but will reinforce the underside later just to be sure.

[Old School]

Some progress has been made however a severe medical emergency in the family has meant that I have been visiting a close relative in the hospital most of the last four weeks. A carbon fibre inlay has been accomplished plus carbon fibre vertical struts fitted under the forward deck with install to be finished by my son (it is his boat).

Today I set about fitting the stuffing tubes. Perhaps by sheer luck, alignment is less than 5 mm apart over a distance of almost one metre, inferring that the tubes are parallel. I check with two lengths of one metre 6 mm carbon fibre rods shimmed inside the stuffing tubes and extending aft beyond the transom. After the motor mounts have cured then I will remove the motors and then finish the install on the stuffing tubes, cutting them to length.

When installing stuffing tubes I like to use the next size up brass tubing (in this case 3/8" O.D.) and bond this in the transom. Once cured this acts as an anchor to enable setting up the 11/32" stuffing tubes. I finish the larger 3/8" tubing sleeve flush with the transom outer face. The stuffing tube then extends approximately 2 - 3 mm beyond this, acting as a solid point to attach the Speedmaster nitro stinger. The stinger mount is drilled to accept the 11/32" tubing, still allowing the stinger shaft to be adjusted for either positive or negative attitude.

Before the stuffing tubes are finally installed I need to work out where the water cooling inlets will be fitted, whether mounted to the sponson aft lower surface or transom mounted.

The Turnigy T20 (Proteus) motors do look very tiny indeed in this hull. Hopefully, the motors will be run with a "Y" winding (730 kv) on either 10s or 12s. Balance (CoG) will be an issue with this hull due the long overhang at the bow and foredeck. I did add epoxy and two-part foam to the tips plus additional carbon fibre around the nose of the hull. The batteries will need to be located aft of the motors to attain a 32-34% CoG. Attaining a 40% CoG for speed runs should not be an issue. Unless parasitic weight is added to the aft end of the hull then I do not believe a 30% CoG to be possible.

[Old School]

I have progressed the drives with the stuffing tubes installed and the 1/4" flex drives cut to length and the cut ends soldered. A downside of the Turnigy T20 cooling jacket is that it is not able to be reversed and be able to positiion the cooling outlet nipple at the high end of the right motor because the inlet nipple would foul on the sponson inner wall. The jacket would need to be drilled and a nipple inserted at the 12 o'clock location. Given the difficulty removing and replacing the jacket without damaging the o-ring I do not wish to go there again.

My son has the stinger drives over 1000 klms away so I based the flexshaft length on the stinger installed on my Osprey build. The flexshafts are contra-rotating and are reduced to 3/16" at the propellor end. I have no idea what suitable props will be required but as I am doing just the basic build my son can research that at a later date.

While I do admire the beautiful all black interiors on the masterful creations of those master builders, I build more for functionality rather than aesthetics so do not pigment the epoxy used. The build has a long way to go yet but hopefully I have made the final task a little simpler for my son.

The view of the transom shows the battle scars this hull has endured in its previous life with the multiple strut drives.

[rol243]

as long as the water outlet on jackets are at the top [ 12 o,clock ] doesn,t matter where the inlets end up. not doing counter rotating props hey ?

[Old School]

Fortunately I was able to rotate the jacket to get the outlet almost at 12 o'clock with the inlet just above the tunnel floor. The left motor is set up with a reverse rotation flex and locking collet.

It is up to my son how he sets up the boat in the future. I believe inward rotating props give better directional stability at the expense of cornering speed. Since my son is a fan of outright speed then cornering speed is not that much an issue.