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« on: October 30, 2013, 12:33:57 PM »
VC
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L'enfant Terrible du RCIndia

Inspired by the speedboats that one sees in the good old James Bond movies, I've started scratchbuilding a new model.

Balsa / Japonica / 2mm Ply / Foam Board build.

OAL : 950 mm
Beam : 250 mm
Estimated AUW : 1800 grams
Motor : Speed 550 DC Brushed
Direct Drive with universal joint
Single Propeller: 3 blade 55 mm dia
ESC : 30 A Turnigy (Overkill?)
Power : 3 S LiPo
Power reversal via DPDT switch (servo controlled)

Model will feature open cockpit with working lights. Hopefully, this build will give me confidence to start the much bigger Aquarama Riva someday.

Girish, thanks for the servos!

Posting a few pics that I am loosely following for the build.
Tahoe19-l.jpg
Aastha - 950 mm Scratchbuilt Speedboat
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« Last Edit: October 30, 2013, 01:29:59 PM by VC » Logged
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« Reply #1 on: October 30, 2013, 12:43:12 PM »
sanjayrai55
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Don't wake a Tiger until you've factored the teeth
Cool! Will be following with great interest Cheesy
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« Reply #2 on: October 30, 2013, 01:16:54 PM »
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L'enfant Terrible du RCIndia
Thank you Sire! All started with a Graupner boat that I had as a kid. Many years later a senior gentleman from Gurgaon procured beautifully laser cut parts for the Aquarama Riva. Hats Off A little practice will help me do justice to that beauty when I do build it.

Build started on 27th. Oct. Using an existing keel and modifying it - lot of surgery involved. Bulkheads have to be repositioned and completely redesigned to arrive at the desired shape. Motor has been wired to the DPDT switch and tested - works fine. Stuffing tube is a brass pipe that has been lengthened with the addition of ball point pen skeletons. The greasing funnel on the tube is from the tip of a ball point pen.

Target completion date is set at 30th. Nov. 2013  Giggle
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Re: Aastha - Scratchbuilt Speedboat
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« Reply #3 on: October 30, 2013, 01:33:18 PM »
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Don't wake a Tiger until you've factored the teeth
So, this madness is the fault of that "senior gentleman from Gurgaon?" Ban him, hang him, bake him in pies!!!! Wink
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« Reply #4 on: October 30, 2013, 01:36:31 PM »
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Would have loved to have indulged in the last alternative suggested by you, however, I am a vegetarian in my food habits. Unfortunately...........
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« Reply #5 on: October 30, 2013, 02:03:49 PM »
amitbhisikar.2006
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That will be great boat. Will be following this post. :-).
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« Reply #6 on: October 30, 2013, 09:34:33 PM »
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The only large water body here to run this SPEED boat is the Brahmaputra, I suppose. Bhorolu is out of question! Veterinary pond will be small if you want to test its speed. Have you thought about it? Guwahati outskirts?
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« Reply #7 on: October 30, 2013, 09:56:26 PM »
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 Bang Head Didn't think of that....... Bang Head
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« Reply #8 on: October 31, 2013, 06:59:53 AM »
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Where did you source the propeller from?
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« Reply #9 on: October 31, 2013, 07:03:30 AM »
lastRites
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I have seen that most boat scratchbuilders here use DPDT switches controlled by servos to get reversible brushed motor controllers. Is there no affordable reversible brushed esc available?
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It is the pervading law of all things organic and inorganic,
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That the life is recognizable in its expression,
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« Reply #10 on: October 31, 2013, 09:21:44 AM »
VC
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L'enfant Terrible du RCIndia
1. Prop was sourced from RCD

2. You are the champ - why don't you design one for us? Seriously.

I had sourced 2 reversible ESC's from a forum member (possibly came out of a cars) and installed them on my earlier builds - Mermaid and RAF FIRE Boat. This is my first attempt with a DPDT.

Cheers!
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« Reply #11 on: November 01, 2013, 06:48:38 AM »
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Wink Tongue
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Of all things physical and metaphysical,
Of all things human and all things super-human,
Of all true manifestations of the head,
Of the heart, of the soul,
That the life is recognizable in its expression,
That form ever follows function. This is the law.
 

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« Reply #12 on: November 01, 2013, 10:50:18 AM »
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Deck finalised and side sheeting planks have been cut. Hull sheeting has also started.
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Re: Aastha - 950 mm Scratchbuilt Speedboat
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« Reply #13 on: November 01, 2013, 11:43:13 PM »
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Hull planking almost completed. 3mm balsa cut into strips 50mm wide and stuck with CA to the formers. Hull base from 1.5 mm sheet. Bow section to be done next. All excess will be trimmed away and gaps filled.

Used a heavy book to allow the adhesives on the pre bow curves to set. All joints reinforced with Bond Tite WOOD Adhesive after the CA has dried.

Will be reinforced with layers of Belco automotive putty after the hull has been sanded to shape.
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« Reply #14 on: November 01, 2013, 11:48:32 PM »
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Tedious and time consuming process, however, the results will nullify all that. Hopefully. Head Scratching
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« Reply #15 on: November 02, 2013, 07:08:20 AM »
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Does the angle of the prop cause difference in speed? I had read somewhere that speedboats have the props at a shallower angle than normal boats. "Surface drive" props?
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Of all things physical and metaphysical,
Of all things human and all things super-human,
Of all true manifestations of the head,
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That the life is recognizable in its expression,
That form ever follows function. This is the law.
 

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« Reply #16 on: November 02, 2013, 11:11:48 AM »
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Yes it does affect the speed/performance. The prop should ideally be parallel to the hull for best efficiency. The steeper the angle of the prop, the worse the efficiency as it will generate a down thrust into the water and cause the hull to rise. The shallower the angle, the more water it will push to the rear of the boat with increased efficiency and speed.
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« Reply #17 on: November 02, 2013, 01:46:20 PM »
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Nice... very nice...
I wish I will be able to get the neatness of your builds in my builds
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« Reply #18 on: November 02, 2013, 03:57:49 PM »
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Blackbird!!!
Really apperciate you build VC sir very excellent boat Smiley Great build Smiley
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« Reply #19 on: November 02, 2013, 05:12:58 PM »
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Running out of adjectives. Wish I could have the same level of dedication that you have.  Hats Off Hats Off Hats Off
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« Reply #20 on: November 02, 2013, 05:41:09 PM »
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That is one beautiful boat taking shape. Eagerly waiting….
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« Reply #21 on: November 02, 2013, 05:44:40 PM »
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Thank you gentlemen. The bow is the always the most difficult to shape and I am about to start on it now.
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« Reply #22 on: November 02, 2013, 07:54:16 PM »
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Amazing scratch build, VC bhai. Cheesy

Quote from: lastRites on October 31, 2013, 07:03:30 AM
I have seen that most boat scratchbuilders here use DPDT switches controlled by servos to get reversible brushed motor controllers. Is there no affordable reversible brushed esc available?
HobbbyKing 45A Xcar ESC (brushed) for 750 rupees, shipped. Ordered 2 weeks ago, now waiting patiently. Cheesy
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« Reply #23 on: November 02, 2013, 09:55:41 PM »
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Anjan, link please. This one?

http://www.hobbyking.com/hobbyking/store/__32025__HobbyKing_X_Car_45A_Brushed_Car_ESC.html
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« Reply #24 on: November 03, 2013, 02:07:58 AM »
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VC bhai, yes that one.
Check this site for product buddy codes for discount-- http://hk.rc-international.info/swarm
I got mine for around $11 inclusive of shipping.
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