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Author Topic: New Build for BMPRS racing A-Class  (Read 8053 times)

craig dickson

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New Build for BMPRS racing A-Class
« on: April 09, 2013, 06:14:23 PM »

 Hi Folks
Having enjoyed my introduction to  BMPRS in 2012 mainly being pit man for my twin brother, I thought it was time to build a boat and get some racing in myself for 2013.  I have opted to build the Crusader II from Bernard Holder powered by an SC46 engine with a Prestwich tuned pipe. This boat is proving an absolute joy to build as its hull design gives loads of access and plenty of room for all of the components.
The purpose of my topic is to share some build photos. These may be of interest to seasoned builders but hopefully also beneficial to any folks relatively new to model power boat building and wanting to see some angles of how a model power boat can be put together.
My first challenge was engine and prop tube installation: Shaft angle was kept as low as possible being 9.5 degrees. The exit hole for the tuned pipe was later widened in diameter to allow for clearance.

This photo shows the prop tube and rudder externally (front of the skeg and rudder have been sharpened to reduce drag):

 
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craig dickson

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Re: New Build for BMPRS racing A-Class
« Reply #1 on: April 09, 2013, 06:21:14 PM »

Rudder servo mount in place:

Servo vertical alloy brackets to take the clamp mounts:

Water pick up externally:

 
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craig dickson

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Re: New Build for BMPRS racing A-Class
« Reply #2 on: April 09, 2013, 06:28:17 PM »

Battery pack suround. To take a 5 cell pack wrapped in foam secured with plastic ties:

Radio box surround:

Internal reinforcement of radio box flange for lid:
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craig dickson

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Re: New Build for BMPRS racing A-Class
« Reply #3 on: April 09, 2013, 06:32:26 PM »

Access hole cut out:

Dry fit of radio box:

Box fitted in pre-fibreglass tape:

 
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craig dickson

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Re: New Build for BMPRS racing A-Class
« Reply #4 on: April 09, 2013, 06:36:06 PM »

Those importat pilots of the boat.....

Alloy fuel tank cradle:

Tank in place:
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craig dickson

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Re: New Build for BMPRS racing A-Class
« Reply #5 on: April 09, 2013, 06:39:47 PM »

Front grab handle:

Grab handle mounts (alloy backing plates fitted underneath the deck for strength):

 
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craig dickson

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Re: New Build for BMPRS racing A-Class
« Reply #6 on: April 09, 2013, 06:42:46 PM »

Dubro fuel filler valve and mount bracket:

Iternal fittings:

 
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craig dickson

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Re: New Build for BMPRS racing A-Class
« Reply #7 on: April 09, 2013, 06:50:33 PM »

Top hatch retaining brackets and quick release clips (one each side):

Front bulkhead (with vent holes for expanding foam to be added):

Hull and deck joined with plenty of clips:
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craig dickson

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Re: New Build for BMPRS racing A-Class
« Reply #8 on: April 09, 2013, 06:52:03 PM »

The front bow section has now been filled with expanding 2 part marine grade PU foam.
I will post further photos once the final build stages have been completed.
Cheers
Craig
PS. If you have read this far, thank you for your time in reading/looking at these threads.
Please feel free to make any comments or ask any questions.
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black magic racing

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Re: New Build for BMPRS racing A-Class
« Reply #9 on: April 09, 2013, 07:57:25 PM »

about time craig,nice build so far mate :-))
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F1 madness

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Re: New Build for BMPRS racing A-Class
« Reply #10 on: April 09, 2013, 08:07:40 PM »

Looks good  :-))
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Danny

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Re: New Build for BMPRS racing A-Class
« Reply #11 on: April 09, 2013, 09:30:56 PM »

Hi Craig, nice build and very useful photos.
I can't see where your cooling outlet is, but make sure its high up on the left so the jet can be easily seen from the bank.  Another tip is to lay absorbent kitchen roll in the bottom of the radio box.  Then, if you do get a slight seepage (oooh matron!) then the odd drops will be soaked up rather than being bounced about in the box until they find something interesting to wet!
Cheers and have fun
Danny
 

tmbc

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Re: New Build for BMPRS racing A-Class
« Reply #12 on: April 09, 2013, 09:31:52 PM »

about time craig ! great build m8 just watch out for luke  :-)) :-)) :-))
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craig dickson

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Re: New Build for BMPRS racing A-Class
« Reply #13 on: April 09, 2013, 09:55:38 PM »

Thanks very much for your encouraging comments!
Oh just on a typo error, this hull is the Crusader III (not the II as first stated).
Danny, thanks for your note on the water cooling outlet. You are very observant. That is the one hole in the hull that I forgot about despite buying a neat brass outlet fitting.
I will fit it on the left side as per your good suggestion.
Cheers
Craig :-))
 
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A66

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Re: New Build for BMPRS racing A-Class
« Reply #14 on: April 09, 2013, 10:31:33 PM »

Hi Craig, Builds looking good so far, take it you will be testing this weekend then!?LOL  :-)) :-))
Steve.
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Re: New Build for BMPRS racing A-Class
« Reply #15 on: April 10, 2013, 05:51:19 AM »

Hi Craig, I like the use of the MG hood fastener you are using to hold the lid on, very clever too. You are doing a very nice build, thanks for sharing.  Mick B.
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martno1fan

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Re: New Build for BMPRS racing A-Class
« Reply #16 on: April 10, 2013, 05:42:54 PM »

Hi Craig, nice build and very useful photos.
I can't see where your cooling outlet is, but make sure its high up on the left so the jet can be easily seen from the bank.  Another tip is to lay absorbent kitchen roll in the bottom of the radio box.  Then, if you do get a slight seepage (oooh matron!) then the odd drops will be soaked up rather than being bounced about in the box until they find something interesting to wet!
Cheers and have fun
Danny

One word Danny Tampons oohh err  {-)  soak up plenty of water and then some lol.
Mart
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craig dickson

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Re: New Build for BMPRS racing A-Class
« Reply #17 on: April 10, 2013, 06:07:27 PM »

Hi Mart
Though I laughed the tampon idea seems a cracker! I wonder what my wife will say if I ask her for a tampon. She'd probably say "Shouldn't you go and see your doctor first Craig?"  {-)
Mick, the clips that hold the deck on came from Prestwich Model Centre. I didn' know they were MG clips. All I did was use some 3mm thick alloy plate bent and drilled to hold the clip horizontal.
Steve, unfortunately won't be ready for this weekend. Despite a few days holiday I have been busy fitting thirteen 6x5 foot fence panels today and boy that is harder graft than I expected.
Cheers
Craig
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craig dickson

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Re: New Build for BMPRS racing A-Class
« Reply #18 on: April 12, 2013, 08:24:39 PM »

Should we bother with hatch flotation devices?
I decided to attach  some flotation to this hatch on the basis of if it comes away from the boat I will be able to retrieve it. Also if the boat flips and the hatch remains attached (as I hope it will) the foam will give extra buoyancy to the boat.
I opted for plastic securing ties  for minimal weight and with them being a neutral colour they are hardly noticeable when viewed from outside the hatch.
Cheers
Craig

 
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tmbc

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Re: New Build for BMPRS racing A-Class
« Reply #19 on: April 19, 2013, 10:00:59 AM »

craig

why didnt you fibreglass 2 small strips of metal in slightly arched so you could pass the cable tie through and then you wouldnt have had to make any holes !

the boat looks great at weekend too m8 cant wait to see it on the water  :-)) :-)) :-)) :-)) :-))

mark
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martno1fan

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Re: New Build for BMPRS racing A-Class
« Reply #20 on: April 19, 2013, 06:41:04 PM »

Just silicone some poole noodle to it,doesnt need that much to be honest.
Mart
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craig dickson

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Re: New Build for BMPRS racing A-Class
« Reply #21 on: April 19, 2013, 08:03:42 PM »

craig

why didnt you fibreglass 2 small strips of metal in slightly arched so you could pass the cable tie through and then you wouldnt have had to make any holes !

the boat looks great at weekend too m8 cant wait to see it on the water  :-)) :-)) :-)) :-)) :-))

mark
Hi
The way you suggested I agree would have been neater. The main reason for not doing this was that because this hull has a lot of freeboard I wanted absolute minimal weight above deck level to maximise stability. And the "clear" coloured plastic ties are actually hardly noticeable in respect of the small section showing above the hatch. That should be evident later when I photograph the finished boat.
Silicone would have been an alternative option and probably just as effective I agree.
Cheers
Craig :-)
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craig dickson

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Re: New Build for BMPRS racing A-Class
« Reply #22 on: April 21, 2013, 06:06:08 PM »

The boat now race ready and finished:

And the internals:
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craig dickson

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Re: New Build for BMPRS racing A-Class
« Reply #23 on: April 21, 2013, 06:08:16 PM »

This short video clip was taken yesterday on its first test run prior to its first BMPRS race next weekend at Nottingham:
https://www.youtube.com/watch?v=l6hFLnbxrQw
Cheers
Craig
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tmbc

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Re: New Build for BMPRS racing A-Class
« Reply #24 on: April 21, 2013, 07:44:14 PM »

looks good craig be good to see it racing at weekend  :-)) :-)) :-))
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