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๐ฌ Re: Robbe PT15
5 years ago by ๐ญ๐บ MouldBuilder ( Vice Admiral)
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I use the Stabilit Express for most of the joints that need good strength and to be totally water tight. It is a really reliable glue. It is quite difficult to get in the UK also. I get mine from Germany.
Peter.๐ ▲
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Remove Ads ๐ฌ Re: Robbe PT15
5 years ago by ๐ฌ๐ง Martin555 ( Fleet Admiral)
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Excellent Cash,
I just thought that i should mention it. Martin555. ▲
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๐ฌ Re: Robbe PT15
5 years ago by ๐บ๐ธ Cashrc ( Vice Admiral)
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Doug, Iโve used those Dubro EZ connectors for years, but mostly on throttles. On flight controls Iโd use snap links and an l bend at the servo and a clevis at the control horn. I usually do the same thing on boat rudder linkage especially if itโs a little hard to access.
Yes, it did bind a bit, but I used an oversized servo are so I relieved the arm where the snap link bound at full throw. Iโm getting about 60 degrees plus movement each way at full throw, I should be good. This might be my last build for a while as I have some small things I need to do to the Studebaker....but I still have my eye on that Deans Pibber. That way Errol the Cat and I can double up our patrols. Might rub catnip on the rudder stick let him start with that๐คฃ ▲
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๐ฌ Re: Robbe PT15
5 years ago by ๐บ๐ธ Cashrc ( Vice Admiral)
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Hi Martin. The glue I used is epoxy mixed with micro balloons, and the stuffing box is installed with epoxy mixed with a little baby powder. I scuff the joint liberally with very coarse sandpaper so as to give the epoxy something to grip. So far Iโve not had a problem with any of my boats, as Iโve done all of them the same way with filled epoxy and a thorough scuffing. I did think about putting say, 1/8th square strip fwd and aft of the bulkhead joint, but that idea came to me just as the glue got good and hot as it cured, which was just a little too late.
Cash PS-I do have a small stash of Stabilit Express, but I hate to use it unless absolutely necessary as itโs hard to get in the US ▲
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๐ฌ Re: Robbe PT15
5 years ago by ๐ฉ๐ช RNinMunich ( Fleet Admiral)
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Hi Cash,
So far so good๐ I tend to agree with Martin though! Coupla points๐ The hull and motor bulkhead appear to be plastic, probably styrene? So I would have used an appropriate bonding solvent glue to literally weld the bulkhead in. Rather than the apparently surface type glue you have used. Risk of cracking off the surface under vibration!! Since it is done now I would reinforce it by 'welding' in support brackets both sides of the gearbox. --> On a closer (magnified) look, the bulkhead appears to be plywood, hence choice of glue! I might have made it from thick plasticard to match the hull material, or ally with right-angles at the ends to increase the area of attachment to the hull and rigidity. Rudder servo on it's side- Appreciate why, I was forced to do that in my Sea Scout in the tiny rear compartment. No chance to stand it up and I did not want to cut holes in the floor. I too first used a plastic clevis, similar to yours, but then found that on full left rudder command the clevis jammed on the servo body or output shaft.๐ Hope you've checked for that! In Sea Scout I solved it by swapping the clevis for small screw type connectors from model aircraft - see pics. They can be fixed on the outside of the rudder arm with no danger of binding on the servo๐ Here you can find some inspiration for detailing๐ ▲
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๐ฌ Re: Robbe PT15
5 years ago by ๐ฌ๐ง Martin555 ( Fleet Admiral)
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Hi Cash,
You're off to a good start. It is probably to late now but the bulkhead that holds the shaft/gear (red bit) is glued in with some sort of brown glue and the rudder tube support seem to be glued in with what looks like Araldite. The surface of the hull has to really be scratched up and partly cut in to so that the glue has something to grip to. The only reason i mention this is i have seen bulkheads like this pull away easily. Maybe it is still possible to clean off some glue and add some plastic to the hull/buikhead joints as the plastic will hold better to the hull plastic, then put a small screw through. Martin555. ▲
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๐ฌ Re: More hull work
5 years ago by ๐บ๐ธ Cashrc ( Vice Admiral)
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I decided to pull the 540 in lieu of an new old stock Goldberg โTurbo 550โ I had built an old Goldberg Mirage airplane a few years ago and used a brushless outrunner to power it, the 550 motor was included in the kit. The Carl Goldberg company used that motor in both the Mirage and Electra sailplanes, when I was an avid aviation modeler I built both. I had built a Mirage while station in Germany in 88-92, and the 550 powered that plane nicely on 6 cells, even back then. Itโs a long can motor similar to the EF76II that came in the PT15, but I suspect itโs a hotter wind, 27 turn or possibly 24, as it winds up considerably better on 7.2 volts. Hopefully Iโll have a decent turn of speed on 6 nimh or 2 lipos, if not I might do a brushless swap or a hotter open end bell brushed motor....or just go to a three cell lipo and see how long the motor lasts๐คฃ
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Remove Ads ๐ฌ Re: More hull work
5 years ago by ๐ฌ๐ง Martin555 ( Fleet Admiral)
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Very nice indeed Cash.
You are doing a brilliant job. I love the clean lines and the crispness of that hull. Keep up the good work. Martin555. ▲
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๐ฌ Re: More hull work
5 years ago by ๐ฟ๐ฆ redpmg ( Commodore)
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Years ago a youngster in our club had one of these Cash. Made a good job of building it but used a Graupner 2.5/1 geared shaft/prop set. Could never get it to plane properly, tried different props and eventually swopped the entire unit for a direct drive 600 with a p30 prop and that did the trick.
Found a RTR boat years ago very similar to the PT15 - but with those awful submarine motors and tank steering. It has the sharpest chines I have ever seen - could almost cut your fingers on them . Always meant to modify it . Love to see how your one performs. Nice build so far. ▲
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๐ฌ Re: Yee-ha!!! Paint!
5 years ago by ๐บ๐ธ Cashrc ( Vice Admiral)
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Thanks for the comments yโall, I do appreciate it๐
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๐ฌ Re: Yee-ha!!! Paint!
5 years ago by ๐ฌ๐ง Martin555 ( Fleet Admiral)
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Hi Cash,
What a difference a few coats of paint makes. nice job. keep it up. Martin555. ▲
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๐ฌ Re: Superstructure, or my love/hate affair with plastic
5 years ago by ๐บ๐ธ Cashrc ( Vice Admiral)
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You paint the exterior...Robbe did something similar with my San Remoโs cabin top, itโs made of the same material. Itโs what they do,or did I should say. Come to think of it my Acapulcoโs cabin is done up the same way too.
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Remove Ads ๐ฌ Re: Superstructure, or my love/hate affair with plastic
5 years ago by ๐ฌ๐ง marky ( Commodore)
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Daft question,do you paint the exterior or the interior of the clear bit ?.
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๐ฌ Re: Superstructure, or my love/hate affair with plastic
5 years ago by ๐ฉ๐ช RNinMunich ( Fleet Admiral)
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"What kit is this PT15 Cash?"
It's an old Robbe kit Pete. ๐ ▲
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๐ฌ Re: Superstructure, or my love/hate affair with plastic
5 years ago by ๐ฌ๐ง Rookysailor ( Commodore)
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What kit is this PT15 Cash? like the idea of moulded superstructure in clear plastic, will make the windows easier to mask, then paint.๐
Cheers, Pete ▲
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๐ฌ Re: Superstructure, or my love/hate affair with plastic
5 years ago by ๐บ๐ธ figtree7nts ( Admiral)
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Hi Cash,
My Brooklyn Tug Superstructure is made the same way! It will look very good once painted! I taped my windows with electrical tape. Very carefully cut it to size. Press down on the tape. When done it will look fantastic! On my superstructure you could barely see the details before painting it! Now look at it! Except for the booboo! You'll see it's going to look great! ▲
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๐ฌ Re: Superstructure, or my love/hate affair with plastic
5 years ago by ๐ฌ๐ง Martin555 ( Fleet Admiral)
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Hi Cash,
A few coats of paint will make that look great. Wall done. "most people wonโt notice it but I know itโs there...." The problem with this statement is because you know it will bug you until you change it.!LOL! Martin555. ▲
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๐ฌ Re: Painted superstructure
4 years ago by ๐บ๐ธ Cashrc ( Vice Admiral)
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Hi Mouldbuilder! I agree with you, masking isnโt fun. My saving grace is Tamiya masking tape in different widths and some tape sold over her called โFrogtapeโ. That tape will not bleed, and really gives one a sharp line.
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Remove Ads ๐ฌ Re: Painted superstructure
4 years ago by ๐ญ๐บ MouldBuilder ( Vice Admiral)
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Looking really nice. I am making a Robbe kit with a similar cabin structure. I have found this part to be tricky. I have had the most difficulty in placing the masks over the windows.
The paint job looks really good.๐ ▲
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๐ฌ Re: Painted superstructure
5 years ago by ๐บ๐ธ figtree7nts ( Admiral)
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Hi Cash,
Great job, Looks very good! Cheers, Ed ▲
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๐ฌ Re: Painted superstructure
5 years ago by ๐ฌ๐ง Rookysailor ( Commodore)
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Looks totally different, now there's a coat of paint on.
Cheers, Pete ▲
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๐ฌ Re: Painted superstructure
5 years ago by ๐ฟ๐ฆ redpmg ( Commodore)
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Looking good Cash - getting along nicely. Do you think the plastic got a bit brittle with age ? Noticed that styrene tends to yellow then gets powdery & brittle.
Sometimes think its easier to live with a model someone else built - on your own ones you remember every little fault - but don't notice them on other peoples........ ▲
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๐ฌ Re: Painted superstructure
5 years ago by ๐ฌ๐ง Martin555 ( Fleet Admiral)
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The difference a coat of paint makes is amazing.
Well done. Martin555. ▲
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๐ฌ Re: More superstructure details
5 years ago by ๐ฌ๐ง Rookysailor ( Commodore)
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If your like me Cash, I love all the little detail work on grey boats! I know there's more to break off when sailing, but the detail makes the craft more like the real one, and that's what we all strive for, you are doing a brilliant job,keep it up, figuratively speaking!๐
Cheers, Pete ▲
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Remove Ads ๐ฌ Re: More superstructure details
5 years ago by ๐ฟ๐ฆ redpmg ( Commodore)
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Getting along great - looking good so far
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๐ฌ Re: More superstructure details
5 years ago by ๐ฌ๐ง Martin555 ( Fleet Admiral)
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Cash,
She is coming along in leaps and bounds, well done. I like the idea of using and modifying Lego. Martin555. ▲
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๐ฌ Re: Railing at the rails!!
4 years ago by ๐ฌ๐ง Martin555 ( Fleet Admiral)
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Hi Cash,
To me the detail work is the most interesting part of the build and starts to bring the boat alive. You are certainly starting to bring you'r boat alive. Well done, nice work. Martin555. ▲
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๐ฌ Re: Aerials and masts
4 years ago by ๐ฌ๐ง Martin555 ( Fleet Admiral)
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Very nice work Cash.
With all of those aerials fitted please be careful that you don't poke your eye out. Martin555. ▲
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๐ฌ Re: Superstructure done (for now)
4 years ago by ๐ฌ๐ง Martin555 ( Fleet Admiral)
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Hi Cash,
She is coming to life bit by bit. Nice work. Well done. Martin555. ▲
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๐ฌ Re: Some deck fittings
4 years ago by ๐บ๐ธ figtree7nts ( Admiral)
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Hi Cash,
You are doing a great job on her! Keep up the good work! Ed ▲
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Martin555
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๐ฌ Re: Some deck fittings
4 years ago by ๐ฌ๐ง Martin555 ( Fleet Admiral)
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Nice work Cash.
Keep it up. Martin555. ▲
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