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Author Topic: Perkasa to Brave Swordsman, a long overdue conversion.  (Read 10970 times)

smudger1309

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Re: Perkasa to Brave Swordsman, a long overdue conversion.
« Reply #25 on: February 26, 2018, 10:13:13 pm »

i have 1:92nd  but its modify hull but she good on the water
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ballastanksian

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Re: Perkasa to Brave Swordsman, a long overdue conversion.
« Reply #26 on: February 26, 2018, 10:32:34 pm »

She's looking great. I did a bit of searching and I think the gun is a 'Navalised' 20 pounder originating from the gun the Centuron carried before the 105mm gun came along. The Tiger tank barrel looks the part especially with the muzzle ring  :-))
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unbuiltnautilus

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Re: Perkasa to Brave Swordsman, a long overdue conversion.
« Reply #27 on: February 26, 2018, 10:38:51 pm »

Glad I saved it for that 'future' project!
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derekwarner

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Re: Perkasa to Brave Swordsman, a long overdue conversion.
« Reply #28 on: February 26, 2018, 11:06:29 pm »

Yes looking good build-up UBN O0 & that's a rather formable vessel with the 40/60 Bofor mount to compliment on the stern ..... Derek
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unbuiltnautilus

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Re: Perkasa to Brave Swordsman, a long overdue conversion.
« Reply #29 on: March 24, 2018, 07:27:17 pm »

Performance data finally compiled, much less than I expected as I discounted props that proved too slow, produced too high a current drain, or were operating at a very low voltage. Although the 4.8v/6v range provided some interesting results that would suit smaller, fast but not as fast, vessels. With very good low current performance. Proving that down there 'in the dirt' as I described it, currents and performance still have uses, just not on this speed machine!
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unbuiltnautilus

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Re: Perkasa to Brave Swordsman, a long overdue conversion.
« Reply #30 on: March 24, 2018, 07:37:54 pm »

I hope everyone can open the doc attached. Anyway, I have bucked the REVS REVS REVS + VOLTS school of brushless motor operation, and got the performance I want at only 8.4v. The only problem I have now, is that I am tied to NiMh batteries for this voltage. I will try the model on a 7.4v LiPo at some point. I am hoping that the 1 volt drop in voltage may just be mitigated by the slight reduction in weight, and the extra grunt offered by Lipos...well you can but hope!
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unbuiltnautilus

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Re: Perkasa to Brave Swordsman, a long overdue conversion.
« Reply #31 on: March 24, 2018, 07:46:39 pm »

Like my HMS Snowflake and SS Ohio builds, I decided to knock up some resin fittings for the model. Mainly driven by a need for four identical long range tanks, plus we have another conversion within the club, being produced as a Libyan Navy variant with SS11/SS12 Surface to Surface missile fit. This model also needs four long range tanks. Add to this the 40mm Ammunition Lockers, five on mine and ten on the other model..decision made, get moulding!
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unbuiltnautilus

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Re: Perkasa to Brave Swordsman, a long overdue conversion.
« Reply #32 on: March 24, 2018, 07:51:36 pm »

I am most chuffed with the gas turbine exhaust doors. The master started life as some unused resin in the bottom of a shot glass!
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unbuiltnautilus

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Re: Perkasa to Brave Swordsman, a long overdue conversion.
« Reply #33 on: March 24, 2018, 07:59:58 pm »

Today I got some plywood construction under my belt. The forward bridge work today was mainly in 1/16" or 1.5mm ply. I have gone up a thickness for this part of the build mainly for structural strength. Initially it was only going to be two pieces in 1.5mm, with the rest being constructed out of 0.8mm as before. Unfortunately, the structure started to twist as I assembled it. Mostly caused by slightly less than flat plywood, introducing stresses as I went. So 1.5mm ply was used instead, as I used every sneaky trick in the book to get rid of the twist.
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unbuiltnautilus

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Re: Perkasa to Brave Swordsman, a long overdue conversion.
« Reply #34 on: March 24, 2018, 08:05:41 pm »

Most of the re-enforcing is going in AFTER the parts are tack glued together. Cyano gives me an almost instant stick, and is strong enough to allow me to pick up the assembled part, check everything is aligned properly, then beef up with balsa strip or plywood as needed.
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unbuiltnautilus

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Re: Perkasa to Brave Swordsman, a long overdue conversion.
« Reply #35 on: March 24, 2018, 08:11:40 pm »

I am working my way towards the cowling assembly. Not looking forward to it though! Many curves and not much structural support. So I am building such and such a part, while thinking three or four steps ahead to the curvey bits! I have to work like this as at present, I only have a vague idea how I am going to approach this part of the build.


That's Scratchbuilding :} :} :-))
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unbuiltnautilus

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Re: Perkasa to Brave Swordsman, a long overdue conversion.
« Reply #36 on: March 24, 2018, 08:13:43 pm »

I am once again at that point of the build. Construction has caught up with planning....best option, cup of coffee and a night in front of the TV!!
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Re: Perkasa to Brave Swordsman, a long overdue conversion.
« Reply #37 on: March 25, 2018, 02:05:03 am »

Can I ask what you use as a sealer for the plywood?  Dope or sanding sealer or something else?
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unbuiltnautilus

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Re: Perkasa to Brave Swordsman, a long overdue conversion.
« Reply #38 on: March 25, 2018, 08:26:21 am »

Can I ask what you use as a sealer for the plywood?  Dope or sanding sealer or something else?


I usually use Cellulose Sanding Sealer, sometimes I use Shellac Sanding Sealer instead, just cos I have some..also it has a slower drying time, which can be useful for wicking in to softer timbers. Usually at least two quick coats, followed by a dry sand with wet and dry paper. Then a primer coat or filler as needed.
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unbuiltnautilus

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Re: Perkasa to Brave Swordsman, a long overdue conversion.
« Reply #39 on: March 25, 2018, 06:35:50 pm »

Back to my brushless current tests. For those that have a bit of trouble opening PDF documents, I have figured out how to cheat the PDF, so I can display it.
There is not a huge amount of data there, but what is there gives an idea of how quickly the current can ramp up as the voltage rises. The 2 blade 45mm prop that I settled on was, to say the least, unexpected. I was anticipating something at least 10mm smaller diameter as the best match. However, that is why we test things!
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ballastanksian

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Re: Perkasa to Brave Swordsman, a long overdue conversion.
« Reply #40 on: March 25, 2018, 09:21:30 pm »

Excellent working out Dr Nautilus  :-)
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unbuiltnautilus

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Re: Perkasa to Brave Swordsman, a long overdue conversion.
« Reply #41 on: March 25, 2018, 10:28:01 pm »

Excellent working out Dr Nautilus  :-)


Dr Nautilus??  Yes, I can live with that :-))
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derekwarner

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Re: Perkasa to Brave Swordsman, a long overdue conversion.
« Reply #42 on: March 25, 2018, 10:41:33 pm »

ubn.....I am having trouble in understanding what Class of [Fwd] gun mount you are using  %)....[not the Bofor down aft].... Derek
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Re: Perkasa to Brave Swordsman, a long overdue conversion.
« Reply #43 on: March 25, 2018, 10:51:26 pm »

ubn.....I am having trouble in understanding what Class of [Fwd] gun mount you are using  %) ....[not the Bofor down aft].... Derek
Evening, or whatever classes as evening on the other side of the world!


I shall refer you to reply 7 back on page one, where I detail the intended armament fit for the Brave class, and what went wrong, leaving us with Bofors fore and aft.
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unbuiltnautilus

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Re: Perkasa to Brave Swordsman, a long overdue conversion.
« Reply #44 on: April 12, 2018, 11:57:40 pm »

Right ho, construction has once again commenced, following brain cells catching up with build requirements!


First job was to build an aft extension, to support the projecting cowl assembly. This was sanded slightly to give a subtle down angle aft. Made from two layers of balsa wood sheet, it was then rounded off to match what was already there.
Also, I decided to run some 3/16" square balsa beads around the gap in the top of the superstructure. All useful for a good glueing surface when it comes to bonding down the roof.
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unbuiltnautilus

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Re: Perkasa to Brave Swordsman, a long overdue conversion.
« Reply #45 on: April 13, 2018, 12:04:47 am »

The next part of the cowl assembly was the 1/32" ply top. This was initially going to be a one piece, wraparound, that would consist of the side walls and streamlined parts disappearing into the door area...just that bit too ambitious on reflection :o . So, roof with slight fold downs at the sides, plus a slight angle change about an inch aft of the front edge. Scoring the wood ( on the right side!! ) is very helpful for this construction. Allowing me to fold the ply over the existing balsawood shaped formers. Cyano and activator allowing me to build fast, while on occasion, glueing myself to the plywood!
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unbuiltnautilus

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Re: Perkasa to Brave Swordsman, a long overdue conversion.
« Reply #46 on: April 13, 2018, 12:09:27 am »

A bit more CAD was needed, so a Cardboard shape Aided my Design. Due to some sort of structural miracle, it could be recycled for a template for the other side of the superstructure with the absolute minimum of adjustment. Wonders never cease...
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unbuiltnautilus

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Re: Perkasa to Brave Swordsman, a long overdue conversion.
« Reply #47 on: April 13, 2018, 12:17:45 am »

Then things got intense and much plywood was cut to fit, while not many, if any, photos were taken. I must have been enjoying the build process too much.
Repeating the process of scoring and folding, 1/32" ply slivers were bonded in the gaps between the flat panels. These took up the space better than filler alone would do. Re-enforced with cyano glue and zapped with activator, they were then ready for sanding. I use a flat Permagrit file for this work. making sure not to sand straight through the plywood!
Once sanded to a decent profile, the whole lot was then fillered with a one part, air drying filler and left to go hard.
Once sanded down, a handy comparison with the original cardboard mock up was in order.
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unbuiltnautilus

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Re: Perkasa to Brave Swordsman, a long overdue conversion.
« Reply #48 on: April 13, 2018, 12:23:48 am »

The cowl was the part causing me sleepless nights ( Almost ), with that out of the way, mostly, it should be plain sailing from now on in. Offering up the now mostly complete superstructure to the rest of the model, I can see why most people build Brave Borderer, not Brave Swordsman, Swordsman is butt ugly! Still, it should grow on me as the upper works get more 'busy'.
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ballastanksian

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Re: Perkasa to Brave Swordsman, a long overdue conversion.
« Reply #49 on: May 09, 2018, 10:41:01 pm »


It just looks a little more archaic. I would rather have that 20pounder up front to make someone's day a misery any day!


She looks a little cutie UBN  :-)) :-))
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