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Author Topic: Bigish Aquarama Special Build  (Read 12660 times)

ukmike

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Re: Bigish Aquarama Special Build
« Reply #25 on: August 14, 2017, 10:27:15 PM »

Here are some pictures of the lightened and more accurate version of the boat.
Much of the birch ply has been replaced by using a lightweight type ply, not Lite Ply, also much cheaper.
The keel has been perforated with lightening holes and the frames have had as much wood removed as possible.
The 2 deck thingys, don't know what they are called, have been changed to approx 2/3rds light weight ply and 1/3rd birch which will be similarly lightened after fitting.
So far the new parts as pictured are 350 grams lighter than the same original parts so I am on course to acheive my final finished weight.
It is very difficult to fathom the plans as the construction is unusual and the notes in French are baffling, even Google translate is struggling.
Anyway here are the pictures, see what you think.


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ukmike

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Re: Bigish Aquarama Special Build
« Reply #26 on: September 19, 2017, 04:43:19 PM »

Hi.
Progress on the second hull is proceeding, all be it at a snails pace.
Here are some photos of the work so far, the spray rails are built into the hull as per full size, they are formed as an integral part of the double planking and be about 8mm high at the stern tapering to nothing at the bow.
The stern platform or "Ailerons" as the French designer calls it are removable to allow sanding of the hull and then fitted later.
I am having to resort to some filler here and there to get the first layer of Lime planking as near to perfect as I can which should help the Mahogany final layer a little easier to apply.
The bottom is glassed already as it only has a single layer of 3mm Lime.

Mike.
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martno1fan

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Re: Bigish Aquarama Special Build
« Reply #27 on: September 19, 2017, 10:43:10 PM »

Nice work Mike  :-)) .
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derekwarner

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Re: Bigish Aquarama Special Build
« Reply #28 on: September 19, 2017, 11:24:59 PM »

Morning Mike......that double diagonal planking is progressing very well.....it's always a pity to paint it  <:(....

Getting back, the motors appear to be 4 bolted out-runners and the 2 bolt bearing assemblies also appear to be outer spherical and so self aligning

Are the bearing housing outers plastic?.....is the part at the red arrow an inner shaft as a part of the bearing assembly as it appears to be steel and your shafts appears to be brass..........is there a specification sheet available?...

Just going forward a few pages <*<....critical resonance/speed or vibration issue [at a high speed]?

Derek
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Derek Warner

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Davo

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Re: Bigish Aquarama Special Build
« Reply #29 on: September 20, 2017, 12:57:17 AM »

Definitely a labour of love. You must have some excellent woodworking machinery for producing such precision parts (plus your skill to use them!). I have achieved chine spray rails on standard ply constructed hulls by oversailing the ply at the chine rail, profiling as per your pictures then finishing with a little body filler. It certainly keeps the spray down.
Looking forward to he next instalment....
David
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ukmike

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Re: Bigish Aquarama Special Build
« Reply #30 on: September 20, 2017, 08:28:54 AM »

Hi Derek.
The bearings are FL8 floating bearings with alloy housings, the reducing sleeves,( 8mm to 4mm ), are steel.
The 4mm shafts are 316 stainless steel.
The spiral cut couplings will absorb any and all movement in any direction although the alignment of the whole drive train is a accurate as I can possibly make it.
Have fitted whole assembly in situ and run it up to maximum speed with both motors and there doesn't seem to be any problems, in fact, the whole system was amazingly quiet.
I did fear that the the empty wooden hull would act as a loudspeaker, but was amazed by how quiet it was.


The main reason for using 2 floating bearings was to carry the thrust of the props, I didn't like the idea of an ugly wheel collet on the exposed shafts.
The whole setup was very inexpensive and very effective.


Mike.
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ukmike

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Re: Bigish Aquarama Special Build
« Reply #31 on: September 20, 2017, 08:54:26 AM »

Morning Davo.
Thanks for the reply, unfortunately I don't have many tools for my work, just the usual hand tools plus a 30 year old bandsaw, a home made 8 inch sanding table using a washing machine motor, an equally old jigsaw and my favourite, a Proxxon Moto tool.
All of the cutting out was done using the bandsaw or jigsaw.
How I would love a selection of machines but have neither the space or finance any of them.


Mike.
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derekwarner

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Re: Bigish Aquarama Special Build
« Reply #32 on: September 20, 2017, 10:00:09 AM »

Thanks Mike for the understanding.......it is always good to see quality fit for purpose components selected for drives  :-))

Having said this, will the drive line not always be in compression rather than tension when running ahead?

Derek
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ukmike

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Re: Bigish Aquarama Special Build
« Reply #33 on: September 20, 2017, 11:31:57 AM »

Not the case Derek, any thrust fwd. or reverse is stopped at the FL8 as the shafts are locked  at that point by 2 grub screws in each 8mm bearing onto each of the sleeves and 2 in each reducing sleeve on to each shaft and the bearings themselves have absolutely NO backward or forward float.
That was the whole point in using them.


Mike.
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derekwarner

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Re: Bigish Aquarama Special Build
« Reply #34 on: September 20, 2017, 11:52:09 AM »

Mike ...when I looked for 'FL8 floating bearings' the only meaningful page was the SKF link for the same part number...but this relates to two bearings in combination but apart with the <.....> and >......< capacity

I understood why you had chosen such a bearing O0....and is good to understand for members [me included].....as to the capability of these FL8 assemblies

Is a WEB link available?.....  Derek
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canabus

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Re: Bigish Aquarama Special Build
« Reply #35 on: September 20, 2017, 12:02:51 PM »

Hi UK MIKE
Very nice setup !!!
Quiet as a mouse !!!
We realigned and upgraded a drive line in a mate's boat.
The red universe joint went again!!!
Replace the bearings and shaft, realigned the motor mount which was the main problem.
Used my motor alignment tool and installed the motor with a solid coupling.
The motor is rated for 18 volts, but, only runs 12 volts.
We run it on 18 volts and the owner said it's quieter than ever!!
But why is the motor revving so hard !!!
He was totally happy with our upgrade and that carton of beer was dam nice.

The boat was in the water at the weekend(only 12 volts) the quietest boat ever!!
   
  :-))
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martno1fan

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Re: Bigish Aquarama Special Build
« Reply #36 on: September 21, 2017, 12:29:07 PM »

Hi Mike if you still have the first one you half built id be interested in buying it and finishing it off and using it as a plug to make a fiberglass version .
Mart
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ukmike

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Re: Bigish Aquarama Special Build
« Reply #37 on: September 21, 2017, 01:05:05 PM »

So sorry Martin, I took it to the local council tip along with some other rubbish that had to go.
Shame !!

Mike.


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martno1fan

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Re: Bigish Aquarama Special Build
« Reply #38 on: September 22, 2017, 05:44:08 AM »

So sorry Martin, I took it to the local council tip along with some other rubbish that had to go.
Shame !!

Mike.

<*< <*< <*< hehe oh well worth a try mate no worries .
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bj

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Re: Bigish Aquarama Special Build
« Reply #39 on: September 23, 2017, 07:39:09 AM »

Mike ...when I looked for 'FL8 floating bearings' the only meaningful page was the SKF link for the same part number
Is a WEB link available?.....  Derek
The part in the picture is what I knew as a Pollard Self Aligning Cartridge Bearing (designed for agricultural use) but they seem to be defunct now.
Nearest that I could find was http://www.bearingson.com/category/2-bolt_flange_bearings/cast_iron_2-bolt_flanges/saft200_series/1_2-bolt_ductile_flange_bearing_saftd205-16g.asp?page=2&SortType=0
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ukmike

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Re: Bigish Aquarama Special Build
« Reply #40 on: December 08, 2017, 04:15:34 PM »

Hi.
The build is not dead but is on hold due to family health reasons.
My wife has been in hospital for several weeks but is now home, unfortunately as yet, cannot do much for herself so I have been looking after her of course as well as running the house and seeing to her little dog Albert. Didn't realise how much involved in keep a home going.
To make matters worse, her Father of 95 passed away very recently which has compounded the problem.

Anyway, back to the build.
I have had to bring the boat along with the wood, electronics and all of the bits that are needed to finish the build indoors due to my shed getting quite damp in the winter months and don't want to risk any damage to anything.

I have however made the twin rudder control linkage and fit the servo. All of the materials excluding the 2 tiller arms I already had leftover from my flying days.
The servo is a 12.5Kg metal geared digital waterproof type and the pushrods are carbon fibre tube. The bellcrank I cut from Paxolin sheet.
It seems to work quite well but needs a little work work before it is finished.

Here are some photos of the assembly, they may be of interest.
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Martin [Admin]

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Re: Bigish Aquarama Special Build
« Reply #41 on: December 08, 2017, 06:02:58 PM »


Good to have you back Mike.

Our kindest regards to your good lady, we wish her well.   O0





Blue anodised aluminum ball end joint .... that's POSH for you!  :o
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martno1fan

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Re: Bigish Aquarama Special Build
« Reply #42 on: December 11, 2017, 06:28:47 AM »

Sorry to hear about your good lady Mike , i wish her a full recovery and hope you both have a good Christmas .
Mart
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ukmike

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Re: Bigish Aquarama Special Build
« Reply #43 on: December 11, 2017, 09:02:29 PM »

Sorry to hear about your good lady Mike , i wish her a full recovery and hope you both have a good Christmas .
Mart

Many thanks Martin, I'll pass your good wishes on to her.
Mike
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Davo

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Re: Bigish Aquarama Special Build
« Reply #44 on: January 05, 2018, 05:17:07 PM »

A very neat well engineered solution to the steering requirements.
You may already have it in hand but I would think of adding some vertical ply stiffeners between the rudder posts and the transoms for and aft. Hitting debris with the rudders at speed could otherwise twist the posts and damage the hull. I see you have an amount of floor stiffening but a bit extra may be useful.
A masterclass in woodwork.
Looking forward to the finished boat.
I hope your wife is recovering well and 2018 sees improved health.
David
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ukmike

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Re: Bigish Aquarama Special Build
« Reply #45 on: January 06, 2018, 01:51:02 PM »

Many thanks for kind words David.
Will take on board your suggestion re the rudder post reinforcement, never gave that a thought !!
Mike.
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ukmike

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Re: Bigish Aquarama Special Build
« Reply #46 on: March 31, 2018, 03:20:17 PM »

Build resurrected, at last!

Have revamped the transmission system as I wasn't convinced that there would be enough power from the motors.
The replacements are 50mm size, 1500 watts each and 6 cell Li Po's.
Have completed the exposed shaft setup,(just fitted dry at the moment).
Also have altered the motor mounting.

Here are some photos of the work so far.
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ukmike

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Re: Bigish Aquarama Special Build
« Reply #47 on: April 28, 2018, 04:30:48 PM »

Back in shed now so this thread may get a little more interesting.
Having recovered from illness, both my wife and myself, progress will start to be made, also, have had a long wait for mahogany.

Here are some photos of the completed spray rails and transmission, water pickups, propshaft p brackets and rudders temporally fitted.

Mike.

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ukmike

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Re: Bigish Aquarama Special Build
« Reply #48 on: April 28, 2018, 04:42:13 PM »

One more photo which I forgot.
Shaft tubes in place, might make some small fairings covering the tubes.
I need 5mm more thread cutting onto the shafts to enable  the fiiting of the rear cones but the shafts are 316 stainless and I don't have the wherewithall
to do this, any suggestions most welcome.

Mike.
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Davo

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Re: Bigish Aquarama Special Build
« Reply #49 on: May 03, 2018, 08:44:25 PM »

Amazing woodwork re all that planking.
Looking at the rudders, would it have been possible to put a crank on the left rudder at 3 o'clock and just linked (as shown) to the other rudder? It may take some of the energy losses and play out of the system that the centre crank induces. In saying that, either system should work fine.
Hope it is progressing well.
David
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