Slo mo Shun

[Bob Abell 2Participant @bobabell2]

Making progress with the lettering

 

The letters were made by scanning the kit transfer sheet, doubling up on the PC, printing out on glossy paper, cutting each letter out…..painting them with acrylic and glueing them on with PVA and final varnishing…….a long process, but it`s worth it!

 

Bob

[Phil Winks 1Participant @philwinks1]

It looks absolutelystunning Bob ! Remind me how long is this monster

[Bob Abell 2Participant @bobabell2]

Thank you Phil

 

It`s only 1.5m long x 600 wide…….Not as long as GE but it really is a monster!

 

It`s the shear volume of the beast!

 

Still got a lot of work to do yet…….more letters….fin stays……..hand rails….bits and bobs…..rudder……prop shafts……etc

 

But there`s no rush in the present weather…….Brrrrr……it`s piggin` Kalt, up here!

It was minus 6 degrees this morning!

 

Bob

[Phil Winks 1Participant @philwinks1]

Not quite that cold down here only hit -4 this morning !! we’ve got an evening sailing tomorrow at our club pond and already some old timers are saying they won’t attend if its to cold unsuprisingly these are the same ones who said we don’t sail  enough as a club  I ask you what can one do? no pleasing some folks! I have reynolds syndrome, which  is much like vibration white finger, and my hands can go dead even in 15 degrees, and I’ll still be there. Even if only for an hour!

[Bob Abell 2Participant @bobabell2]

The undersurface………..I was told by a speedboat expert, that a few “daggers” may be required, to prevent sideslip?

 

Should be fun!………Bob

[Phil Winks 1Participant @philwinks1]

He’s probably right Bob there’s not a lot in the water once she’s on the plane. But then at that speed I’m guessing she’s designed for straight lines only, or were these raced on a curcuit? Also I would have thought lots of wax polish might be a good idea here! Make her a slippery as possible

[Bob Abell 2Participant @bobabell2]

Hello Phil

 

Thinking about it………..Don`t think wax polish would make any difference………I think it`s the actual  water density, being split, as the boat travels along………..something like that, anyway!

 

Bob

[ashley needhamParticipant @ashleyneedham69188]

that hull looks incredibly incredibly draggy unless on the plane….going to take some getting there!!

 

Cant help thinking that that hollow in the hull could be filled with compressed air as a starter…like that funny Italian torpedo boat we were looking at a while back?

 

Ashley

[Bob Abell 2Participant @bobabell2]

Hello Ashley

 

With the enormous hull area,  it could get on the plane……….the same way as a kite does?………………………eh?

 

Well, it`s quite possible?………………………Bob

[Bob Abell 2Participant @bobabell2]

Work in progress picture

[Phil Winks 1Participant @philwinks1]

WOW looking the business Bob. The thinking behind the wax polish idea is, when a boat moves through the water the water molecules touching the hull are as it were stuck to it and the drag is caused by the rub between the molecules not adhered and those that are this action incidently works like an aircraft wing inreverse holding the hull down. now wax is hrdrophobic and repels the water stopping (hopefully) the molecules from adhereing to the hull allowing it to slide more easily. well thats my theory anyway. Pretty sure I’ve opened a can of worms here lol

[Bob Abell 2Participant @bobabell2]

Just had a crazy idea……..(another)…!

 

What if I applied compressed air to the cavity, before moving off?……..With a little air pump…….the area concerned is almost 2 sq ft!……..aka….a hovercraft…..worth a try at some stage!

 

It would be half way onto the plane?

 

Bob

[Phil Winks 1Participant @philwinks1]

a compressed air cylinder and quick release actuator may be more effective Bob However I can see there being a possible flip over if its a too violent or b released at to high-a speed. conversely if released at too low-a speed a comical but useless bump will prob be all you get. Compressed air cylinders the right size are available they use them on model aircraft to operate undercarriage and on model jets to start the turbine spinning my guess is Al Mcginchy of als hobbies would be the best to advise on size/pressure available

[ashley needhamParticipant @ashleyneedham69188]

Oy !! who suggested this very stratagem in a post or 2 ago !!!! 

 sniff ,I dont mind my posts being ignored

Ashley

[Bob Abell 2Participant @bobabell2]

Hello Ashley

 

Point us in the right direction……….I don`t recall your post?

 

Bob

[Phil Winks 1Participant @philwinks1]

I think he’s refering to this Bob

Posted by ashley needham on 22/12/2009 08:34:30:

Cant help thinking that that hollow in the hull could be filled with compressed air as a starter…like that funny Italian torpedo boat we were looking at a while back?

 

Ashley

 Well Ashley I’m so sorry didn’t think I was ignoring your post just adding to it mate

[Bob Abell 2Participant @bobabell2]

Sorry Ashley…………..I`ve looked back anf found your post………thanks Phil

 

Your suggestion didn`t register with me at the time……….I did mention that the boat being big and wide etc, could get on the plane in a kite like manner………but was ignored…..lol

 

I still think it would tend to “kite” going into wind?…..What do you think?

 

Bob

[Bob Abell 2Participant @bobabell2]

Spot my deliberate mistake!…………………Worragorp!

 

I was just making great progress on the rudder mech, when I spotted a serious error!……….The wooden extension brackets!………No room for the surface piercing props!

 

Back to the drawing board!………………..Must take more whoski wi` watta!

 

Well it is Christmas!……..Happy new year, Fellas…………….Bob

[Phil Winks 1Participant @philwinks1]

Ooops been there done that myself Bob  best wishes for 2010 mate

[ashley needhamParticipant @ashleyneedham69188]

Bob, dont faff around with surface piercing props. The boat wasnt designed for it, and it would take such a long run up and have to

go so fast as you would soon run out of room.

 

Useable fast performance is whats required.  I could probably make my Fantome go twice as fast, but only for 30 yards or so and i would have to slow down.AND it wouldnt run for so long.

 

A big boat like that will APPEAR to be going very fast if the attitiude on the water looks right, and the wake is just so and the engines are whining suitably. Stick some 50,000 rpm brushless in there geared right down 10:1, and yours will be the power and the “wow listen to that” factor.

 

My Fantome doesnt appear to be going that fast, but its a big boat, and the wake against the jetty is something to behold (it swamps it on a close fly-past). It also thrumms along effortlessly at a mere 5,000 RPM.  It also ploughs THROUGH the water and commands it, it doesnt bounce and hop like some cheap RtR.

 

Capitalise on your  plusses. Size, style, engineering, clever bits hanging out the back.

 

YES

 

 

Ashley   

 

PS For heavens sake touch up those bits on the fuselage, where the paint has rubbed off…

 

Edited By ashley needham on 29/12/2009 19:02:41

[Bob Abell 2Participant @bobabell2]

Thanks for your replies Phil and Ashley

 

The attraction of surface piercing props is the big spray at the back!………That`s the only reason really

 

Conventional props would be the easy way out, though………hmmmmmm?

 

Visitors who see my model for the first time, think it`s made of Ali………`till I confess that it`s only cardboard……….Can`t really lose that illusion either!

 

 

Ash………What does your Phantome weigh….what motors……what props……and what batteries?………………….Any idea of the speed in feet per second?

 

Dithering Bob here………staring into space again……..fingers drumming on me hull!……..about to toss a few coins!

 

 

[ashley needhamParticipant @ashleyneedham69188]

OK…

 

5.6kg for the boat, 2.65 for the 12v 7Ahrs gell battery = 6.35Kg    48″ long by 13″ wide.

 

2x MFA 800 motors, twin 50mm high-pitch 3 blade brass props made especially by George Sitek….however the boat kit came with  50mm X plastic 2 bladers…there doesnt seem to be much difference in performance…but the brass props are l&r handed.

The motors only rev to 5000 rpm or so and I dare say this accounts for the lack of difference in push. A straight swap to 850`s would bump up the shove but double the current consumption. I know lots of bods are dismissive of the humble 800/850, but they seem to be ok to me.? 

Speed in whatever measure… dont know.but see the picture for effect.

 

Yours is a bit bigger though I think, and not such a slippery shape, at least, until on the step.

 

Ashley

[Bob Abell 2Participant @bobabell2]

Thanks for the info Ashley

 

For starters……Two 900 motors, with Flexi shafts for future R & D

 

I`ve got four 12v jellies……….. dare I double them up to 24 volts each?

 

What are the risks?………Anybody?

 

Working on the fiendish rudder mech with air rudder for effect

 

Bob

[ashley needhamParticipant @ashleyneedham69188]

Bob, I dont see a problem doubling up on batteries, they are matched after all.

 

If you are having watercooling, then you could divert some of the stuff to form your rooster tail…in fact even if you DONT have watercooling, you could use the same ruse?

 

Motor setup sounds like a plan..if you were to leave sufficient room to try different motors I think you would eventually get there..  you may need the air rudder if it goes fast enough!!

 

Ashley   ps remind me how heavy was your boat going to be? to save me scouring through all the logs   ta

[Bob Abell 2Participant @bobabell2]

Good morning Ashley………and friends……(hopefully)

 

Just weighed Slo Mo and the latest up to date weight, is…….15 lb

 

The Rooster tale sounds an essential suitabell feature……..thanks for the idea!

 

Just making the bellcranks at the Slo mo, with a special crank for the air rudder….all exciting stuff at the Mo

 

Will need to consult Mr ACTion man regarding the 24 volts and his ESC`s

 

Happy New Year, fellas………….Bob

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