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Author Topic: David's Amati Riva Aquarama Build - With some mods...  (Read 14888 times)

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Re: David's Amati Riva Aquarama Build - With some mods...
« Reply #75 on: May 30, 2020, 12:35:53 am »


Now that's a thing!   :-))
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Re: David's Amati Riva Aquarama Build - With some mods...
« Reply #76 on: June 03, 2020, 11:04:54 am »

Morning All


Planking adventure continues...





So far so good, ish... Bow is challenging, for me anyway. Main thing (I think) is that planks are going on flat and true to the frames.  I did sand the frames so they offer a flat surface to the planks for better bonding. A couple of small fillets required at the bow.  As this is first layer of two I think the main issue to get the final shape right for the mahogany layer.  But I suspect this is the easy bit. A couple of more planks and will then have to deal with the revised chines.  O0


I've test fitted the prop shafts to check where they emerge and where the planks will be cut, luckily its just one plank and between two frames:








By the way, the props are ending up about 11cm from the transom, the plans only show the static model prop position as far as I can see, and that's about 5cm, presumably the scale position... There was some logic / experience when building / racing multi boats that with the prop further away from the transom, and so from the rudder, handling at speed was improved in a couple of ways.  (I think... Neck out time...  :-) [size=78%] )[/size]


1. More lift is generated at speed. A combination of factors. The down thrust component of the prop(s) tending to push the hull up. If this thrust is a little forward of normal, its closer to the boats fore/aft balance point when planing, so rather than this thrust just 'lifting the stern', its helping to lift the boat.  A second factor is that the propwash comes off the prop in a spiraling cone, so the vertical component of this energy can either be seen (at worst) as a 'rooster tail' like effect behind the boat if the prop is close to the stern or with the prop further forward this energy pushes against the hull and is used to lift the stern. IMHO.


2. Better directional stability.  When planing there are three components that have a grip on the water (for clarity I'm taking the prop and P bracket as one component as they're very close). The 'V' of the hull (more pronounced at the bow) then the prop(s) and rudder(s) at the stern.  As the hull rises onto the plane the grip on the water of the 'V' is lost to a degree as its out of the water. So that leaves the prop(s) and rudder(s).  If they're close together longitudinally they just grip as one point which is a bit unstable, separated out they grip as two points, more stable.


That's my reasoning for doing it.  And as always, it might just be total garbage.  %%


Best regards to all.
David.



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Re: David's Amati Riva Aquarama Build - With some mods...
« Reply #77 on: June 06, 2020, 04:04:59 pm »

Afternoon All


Planking continues...  Still.


Starting to generate the shape of the new chines, just becoming visible at the bow:











Shaping of the next few planks will decide whether the revised chine will be viable.  :-))


Good weekend to all.
David.

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Re: David's Amati Riva Aquarama Build - With some mods...
« Reply #78 on: June 06, 2020, 05:02:06 pm »

Looking good so far David.

What timber and size are you using for the planks? I've got a future build that's plank on frame.

Chris
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Re: David's Amati Riva Aquarama Build - With some mods...
« Reply #79 on: June 06, 2020, 06:24:50 pm »

Hi David.


You have been busy  :-)) .


Looks a good job so far, interested to see the revised chine.


Just shows what can be done with a microscopic block plane  {-)


Mike
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Re: David's Amati Riva Aquarama Build - With some mods...
« Reply #80 on: June 07, 2020, 10:43:19 am »

Hi Chris


The planks are 7x1.5mm, and I think are limewood. They're part of the Amati kit, it doesn't say limewood but I think I read that somewhere. Maybe Mike knows..?  The next layer is 8x1.5mm Mahogany, I'm assuming this is standard practice to avoid joints lining up too often.


And Mike, that little plane has indeed seen plenty of action so far. Its a pleasure to use.


Best regards
David.

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Re: David's Amati Riva Aquarama Build - With some mods...
« Reply #81 on: June 07, 2020, 12:00:19 pm »

David, Chris.


It is indeed Limewood and European at that.


Unfortunately, Bass is often sold as Lime but that's because the Americans often call Bass as Lime.


There is no comparison to the two, European Limewood is far superior to Bass in every possible way.


BTW, on a different note, have found some incredible wood filler, very smooth, many colours and ridiculously easy to sand, maybe you've already heard of it.


It's called OSMO from Germany, via this company here in England...  www.wood-finishes-direct.com/  not at all expensive.


I try to avoid the need to resort to fillers and use them as a last resort, but this stuff is so good, I now spend my time looking for something to fill  ok2 ok2  Not


Mike.


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Re: David's Amati Riva Aquarama Build - With some mods...
« Reply #82 on: June 07, 2020, 12:51:08 pm »

Hi Mike


Well the limewood does seem to behave well for me. Flexible and easy to work with. Looks to sand well too.


Good timing with the filler recommendation, I've been using a very light balsa filler for general use where it won't be seen, but its no use for the next stages. Just ordered some of the OSMO mahogany and will let you know how I get on.


Best regards
David.

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Re: David's Amati Riva Aquarama Build - With some mods...
« Reply #83 on: June 07, 2020, 01:03:37 pm »

David and Mike

Thanks for the info.

I shall get some of that filler as well. Most are either too hard or too soft and with the former you can end up sanding too much of the surrounding material. Having that problem at the moment with DIY and Polyfilla where I'm filling some defects in the plaster. Sand it down and then have to do more filling!

Chris
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Re: David's Amati Riva Aquarama Build - With some mods...
« Reply #84 on: June 10, 2020, 04:28:03 pm »

Afternoon All


In the midst of forming the revised chine profile. My approach has been to alter the profile of the frames at the chine using wedges, then plank. Aim is to get a smooth modified hull form with flat chines in the mid section that will keep the boat drier and generate lift. (Sorry Carlo...  :embarrassed: [size=78%]  )[/size]


I took off the wedges from my original attempt, I wasn't happy that they were balanced.  New set are cut from plank material, so quite modest in angle, also shaped then cut into two for port and starboard so I know they're identical.  I'm then using from 1 to 3 of these wedges depending on the frame (fore/aft )position, it helps to be able to see the new 'curve' by eye before bonding / planking.





This next picture shows the original chine line, now with a variable gap to the planing surface due to the wedges.





And here is the side planking being extended, and final planing surface planks being clamped.





And here trimmed:





And the profile that I'm hoping will throw water clear rather than inducing it up the hull:








Hope Carlo would have approved... 


Best regards to all.
David.

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Re: David's Amati Riva Aquarama Build - With some mods...
« Reply #85 on: June 11, 2020, 09:01:20 am »

Morning All


Hard to show the chine mod without a direct comparison to the original shape.  This illustrates the mod, diagonal red lines are original V of the hull, those lines would have carried on to the chine in a 'by the plan' build of the original hull shape.  Red areas / lines to left and right illustrate the modified / flattened chines. Generally more lift along the length of the hull, significantly more lift in the mid / forward section:





So hull profile / chine modified with no triangular section wood added over the planking.


Hope that's clearer.


Best regards to all.
David.

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Re: David's Amati Riva Aquarama Build - With some mods...
« Reply #86 on: June 11, 2020, 11:38:57 am »

Neat modification David.

Chris
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Re: David's Amati Riva Aquarama Build - With some mods...
« Reply #87 on: June 16, 2020, 01:10:37 pm »

Afternoon All


Decided to get the prop and rudder hardware cutouts in place through the sub planking:











And this one shows the hardware in context with the hull:





And here's the interior:








Happy with alignment.  :-))


Best regards to all.
David.

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Re: David's Amati Riva Aquarama Build - With some mods...
« Reply #88 on: June 19, 2020, 01:50:09 pm »

Afternoon All


Some progress with planking, and drilled the hull for the water pickups:





And the planking is making its way up the side of the hull, hard chine looking a bit more obvious now:








Best regards to all.
David.

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Re: David's Amati Riva Aquarama Build - With some mods...
« Reply #89 on: June 23, 2020, 05:49:50 pm »

Afternoon All


Progress continues with the first layer of planks up the sides of the hull, and now I know what a 'stealer' is...








The form of the Aquarama hull is really starting to take shape, and its a beautiful design.


Best regards to all.
David.

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Re: David's Amati Riva Aquarama Build - With some mods...
« Reply #90 on: June 26, 2020, 04:47:17 pm »

Afternoon All


A milestone of sorts...  First time I've planked a boat, and first layer of the Aquarama hull is now in place:





And roughly trimmed, but at least its looking more boat like...





Now I can see a few small gaps that need filler, then the inside will be sealed, then the sanding starts.





Can we still say 'nice stern' in these politically correct days..?





Great weekend everyone.
David.

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Re: David's Amati Riva Aquarama Build - With some mods...
« Reply #91 on: June 26, 2020, 05:52:43 pm »

I just love a planked hull and yours is a delight.   :-))

Greg

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Re: David's Amati Riva Aquarama Build - With some mods...
« Reply #92 on: June 26, 2020, 05:59:09 pm »

Hey Greg


Thanks for that, hopefully this as rough as you're going to see it...


Gardening duty over the weekend, but roll on next week and the sanding.


David.

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Re: David's Amati Riva Aquarama Build - With some mods...
« Reply #93 on: June 26, 2020, 06:19:34 pm »

Great workmanship and photos  :-)  I've been advised that I should be building one

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Re: David's Amati Riva Aquarama Build - With some mods...
« Reply #94 on: June 26, 2020, 07:53:30 pm »

I wonder have you seen this ? been going over 2 yrs and still not finished  %%
https://www.youtube.com/c/BacktoHardware/videos

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Re: David's Amati Riva Aquarama Build - With some mods...
« Reply #95 on: June 26, 2020, 10:48:45 pm »

Hi Andy


Thanks for this, and yes I've seen the YouTube link, good job its time lapse..!  Some useful pointers, I don't speak Italian, but good to see the build progress.


I'm also going over UKMikes excellent build log of the Aquarama.


My approach has been to take the kit as a start point, and to take time to get it right. The instructions are best taken as 'guidelines'... I'm finding it challenging, but enjoying it for that reason.


Hope you decide to go with the build.


Best regards
David.

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Re: David's Amati Riva Aquarama Build - With some mods...
« Reply #96 on: June 26, 2020, 10:54:57 pm »

Iím really interested thanks but Iím not clear on what it will cost.
The kit at CMB is £279 but then thereís an etched brass set and a fittings set. I donít think itís obvious what the kit comes with and thereís conflicting spec regarding length depending on what seller you look at
Amati site only gives a weight and no dimensions  {-)
Those videos are superb without the need for dialogue, easy to pause it where needed

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Re: David's Amati Riva Aquarama Build - With some mods...
« Reply #97 on: June 27, 2020, 07:08:38 am »

Morning Andy


Agreed it's a bit confusing. I need to be at my PC on Monday to get you full details. Basically the main kit is static, then you add the hardware kit to convert to RC. But I was not impressed with content of that kit, heavy motors and average quality shafts. So a lot of builders seem to use brushless and third party shafts. The kit comes with all deck fittings, so not sure why it's available as an extra kit... I'll upload pics of fittings on Monday. There are fittings upgrades available from 'Cap Marqettes' you can find them on CMB site.


I'll add up what it's cost me and revert Monday...
Have a good weekend.
David.

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Re: David's Amati Riva Aquarama Build - With some mods...
« Reply #98 on: June 27, 2020, 08:33:26 am »

Thank you David
Iím going to join CMB club for 5% off everything for a year. They are already cheapest on very many things and discount off the kit alone will more than cover the £10 membership. I should have done that before I bought the Boulogne Etaples and the sealed Raboesch prop shaft  %%

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Re: David's Amati Riva Aquarama Build - With some mods...
« Reply #99 on: June 29, 2020, 05:12:31 pm »

Hi Andy


Been considering the build cost of the Aquarama.


So as you say the kit from CMB is around £280.00.


Then its either the running gear in their extra hardware kit at £150.00, or sourcing / building better parts.


There is a set here for the Riva by Krick at around £200.00 that's interesting, but I don't like the rudders...


https://www.krickshop.de/Accessories-Spare-Parts/Accessories-for-Ship-Models/Accessories-for-special-Shipmodels/Motorisierungssatz-ital-Sportboot-25035.htm?shop=krick_e&SessionId=&a=article&ProdNr=25036&p=197&rdeocl=1&rdetpl=productpage&rdebox=box4


I've gone for a pair of Overlander Brushless Outrunner 3530 1100kv motors at around £20.00 each. Built my own shafts and P Brackets, I think prop shop would supply similar for around £30 each.


And two standard scale 1415 (35mm) Prop shop props at around £15 each.


A pair of ZTW Shark 30A ESCs at £20.00 each.


And I've built my own rudders / shafts from scratch.  Maybe a value of say £15.00 each...


So I think that's about £200.00 worth of running hardware, that equates to the contents list of the 'hardware kit' by Amati and sold by CMB for £150.00.


A pair of Turnigy Graphene 3000mAh 3S Lipos at £25.00 each provides the power.


Then its the RC bits and consumables as for any build.


So in round figures so far we're at:


£280.00 Main kit
£200.00 ish for the running hardware
£  50.00 ish for the Lipos
[size=78%]______[/size]
£530.00


I have spent on some specialist parts....  £50.00 for a micro water pump...  £10.00 on faux leather...  LEDs and so on.


I did purchase a couple of 1/10 figures too, say £40.00.


So I'd say overall we're around the £600.00 mark, and if it makes it to the water for £750.00, I'll count that as a win.


A couple of your specific points:


1. Etched brass parts and deck fittings are all in the kit.











Here are the Cap Marquettes Dock Lights (UKMike kindly sent these as they were surplus, they're available via CMB), the kit versions are not good:





Here are the Lipos in place:





Here's a motor / ESC combo:





2. Seating / cushions are in the kit, but a bit nasty.  They're heavy and just a bit agricultural, so will be binned.  I haven't seen a third party set at all.


Looking at your other builds I think you'll love the Aquarama...  It deserves attention to detail and it looks to me like you have that in spades..!  I do think the standard kit build can be improved upon, mainly to get decent performance in terms of handing on the water.  Everyone seems to add a harder chine, and it has to be built light.


[/size]Hope that helps.
[/size]David.
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