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[DJW]

Morning All


Waiting for some free time and better weather to do some water tests. Here's a few pics of the pretty much finished running gear:











Regards to all.
David.

[Stuw]

Looks ready!

[DJW]

Got the Aquarama wet today..! (18 months since opening the box...)



Went pretty well. No water inside, always good. Waterline is good, some more fittings to be added so hull will eventually sit a little lower. Slight list to port, not sure why but will keep that in mind. Water pump works as does the sound system. Motor and ESCs did get warm so I will route some water to them. Motors only drew 9A as a maximum, so I may look as coarser props. Top speed was OK. But could do with a little more, especially if pulling a skier. I guess I might not need the 3:2 reduction that I built in, could even try reversing the gears for a higher shaft speed... Some options to think about.



Outing was to the Elmbridge Model Club lake at Egham. I'm not a member yet, but a very warm welcome from the guys down there. And a very impressive collection of IC powerboats...


I'm pleased with the chine mods, water is deflected out and down and the hull rides high and dry. Doesn't dig in on the turns, and handles well at all speeds.



And a video if anyone's interested...

https://youtu.be/iOqXcmdjqSs

Now the work on the details and fittings....

Regards to all
David.

[Ralph]

That's looking really nice on the water.


A lovely job 


Ralph

[Taranis]

Congratulations David    very nice

[derekwarner]

Superb on water video David


.......lumpy engine tick over  ......[bang-clang]   ....then from ...10 to 40 seconds, I thought she had a terminal transmission failure
.......until she turned & went ZOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOM   [into the distance]


Derek




PS.....may need to periodically check those Teflon washers at the propellers as any increase in speed/thrust may have a tendency to squeeze the thickness of the washers ...I suppose any increase in diameter could be a tell tale!

[DJW]

Afternoon All


Thanks for the comments.


The early part of the video was the boat doing a 270 degree rotation on shafts only. I haven't had chance to check the running gear over but will be doing now it's had a run. The majority of the thrust should be passed to the motor mounts, so hopefully the Teflon washers remain intact. But I'll be checking for sure.


The sound system could do with tweaking a bit. It's not going up the rev range far enough. Having said that it's only at low speed and near the bank that it's really going to be heard.


I don't Iike the brushless whine... the motors are rigidly mounted, so not sure what I can really do at this stage. As has been suggested. I'll try to start thinking of it as turbos doing their thing.


Props are 1415 Prop Shop items, I've ordered a set of 1517 items with a bit more pitch to see how they perform.


Regards to all.
David.

[Stuw]

Looks and sounds good but I see what you mean about the brushless motors whining! Not sure how to stop it though unless you change gear ratios to drop the motor revs? Or maybe increase them in case there is a harmonic being set up? Haven’t a clue but looks fantastic and that boating lake looks good.


 I wonder if that might be a good venue for my Javelin if/when I get it finished? I’m wary of the fact my controlling skills are a bit rusty and wouldn’t want to embarrass myself.

[Taranis]

I believe it’s the esc’s that create the whine. Not really much you can do about it.
Also get the whine on brushed motors from esc’s like Mtronics as I discovered in a tug I bought built.

[DJW]

Hi Chaps


The EBC lake at Egham is very good, lakeside parking, rescue boat, landing stage.  And I believe the club owns it plus some of the land around it.


I think I have to accept the sound with this build. I think you are right about the ESCs Andy, I tweaked the ESCs I thought to be outside hearing range, but maybe not... I was thinking that as I'm using a gearbox that supports the prop shaft on ball races, it could be them. I've a mind to learn from this build and scale up the Amati plans to 1/6 or 1/7, and try to iron out some of the issues.


Regards
David.

[Taranis]

As you know mine is direct drive but its just as noisy due to the frequency of the sound. However out on the water its barely noticeable.

Bigger is so much better    but I have too many models to make to devote to one

[DJW]

Morning All


Not had much time with the Aquarama of late. I've been spending some time with the Cutwater. Its been curved and then soft solder spot filleted to hold it together, then fitted a little better and once the final shape arrived at, a full fillet of soft solder run up the inside. I used a soldering iron, and then a small torch to flow the solder.  I've deliberately filled the screw holes at the leading edge. They're so close to the leading edge it's going to be very tricky to get screws into them, real or just decorative heads.  I was going to re drill them a little further away from the edge, but I actually like the cleaner look:





I'm still in the process of drilling out all the holes, then countersinking the cutwater for the 1.2mm CS SS Screws. For the final fit I'll add some epoxy to the screw threads to seal as they go. (Unless anyone has a better plan...)


[size=78%]


The filled and buffed screw holes are just visible in the pic above, in reality they're very hard to see.


Very best regards to all.
David.[/size]

[DJW]

Evening All
Been looking at the various rubbing strips.  Amati provide some white plastic and suggest painting it chrome. I purchased some chrome car trim, but decided to try 4mm brass D section. I milled out a 4mm slot in some nylon to hold the brass for drilling ready for 1.2mm SS screws.





This is the stern water level rubbing strips / fenders.





And the first deck level rubbing strip.











Strips will then be chromed before final fitting.





Best regards to all
David.

[Stuw]

This looks extremely high quality to complement the rest of your work!

[DJW]

Hey Stuw


Thanks for that.  Slow progress...  Not sure if its just that time of the year, or a bit busier with business, but a bit frustrated here at the lack of time I have for the boat...


I've now got the starboard rubbing strip drilled / twisted / shaped / polished and temporarily fitted.  Pleased to be using the brass, its going to look the part when chromed.











Not too happy with the Amati Musetto up at the bow.  I know UKMike has created his own for his 1/6 build. The Amati version is made up of 3 cast pieces in this version of the kit.  Giving some thought as to how it could be created in brass.


Best regards to all.
David.

[ukmike]

Hi David.


If you do make a new Musetto I would recommend that you use Copper plate. It anneals to a far softer / pliable state than Brass and stays annealed for far longer, allowing you to manipulate it more. Brass hardens very quickly and doesn't like re bending / shaping without re annealing, particularly on a smaller scale pieces.


Just as a matter of interest, the fixed inverted Chevron louvres on the full size Musetto were for allowing air into the FWD cabin which intern had closable / adjustable louvres, operated from the inside, hence the need for the black paint behind the Chevrons.


Boat looks superb.


Mike.

[Mark T]

Hi David


Just catching up with the forum and I agree with Mike about the use of copper, it's far easier to work with and is just a more malleable metal.


And yea - it does look superb