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Re: 40'' Seaplane Tender, new build. mods and improvements.
Ahah a Vampire no less - have about 6 or 7 hours flight time in a DH Vampire T11 courtesy RRAF . First jolly as a raw recruit - was told by pilot - I'm the Captain and will leave the ship last - but if I say "Eject" and you say "What" you will be talking to yourself........... Love them
Went up to 49,000ft - wallowing well - then vertical dive . Reading the dymo tape on the dash "Thou shalt not exceed 550 knots" as the ASI crept up to 600 with the canopy shaking like a leaf ....... Pulling out at 20,000 but only leveling out at about 10,000 but was too busy staring at the floor unable to move - don't know how many G - but sure it was in excess of limits.......
Could not wait to go up again...........
Have a plan for a ducted fan Vampire - but gave up flying years ago when distracted for a second by a stupid question - the newly built Bipe tried to demolish the wall of the ablution block (the only building on the field). Eyesight also deteriorated afterwards and now after a double cataract op see better than in my youth - but responses are no longer up to scratch........
As to Lipos - have a couple of hard celled ones like giant AA batteries , one soft cell 7.4v and two small Lifes 6.6V?
Not used any one of them yet - electrics & myself do not get on - years ago trying to put courtesy lights in my Cortina Mk1 GT was called for lunch - and then promptly asked if the car should be smoking like that ......
The Cressida was very popular here , the one you have is a great version. Invited especially to the local launch of the Cressida as the company I worked for had a fleet of 600 odd
and I was responsible for the transport division........
1 year ago by redpmg
Kiwi of course ahem, cough cough. Alan Gibbs has a farm here on the Kaipara Harbour with fantastic huge sculptures all over it (he commissions artists from round the world) He also has the largest TESLA private lightening coil in the world outside his house there (check out Gibbs Tesla coil and Gibbs Farm NZ.) He also makes aqua quads, trucks and an aqua bike (many of the vehicle sales/ad demos are done on his huge private lake (created from a reshaped gully on the farm)
Ex CEO of Air NZ and a million other companies, lots of $$$ Check out Gibbs
, could be some model possibilities amongst them (like the Aqua truck) Unfortunately another Kiwi co (like Hamilton Jets ) forced to produce O/S, but we still have Rocket Lab !! (so far)
1 year ago by jbkiwi
46'' RAF Crash Tender
One of the difficulties of modelling small craft is that there were hardly two alike . Over 50 years ago I met Peter Danby who commanded a Fairmile C ML in WW2. He said at the time that his boat had as many weapons fitted as they could scrounge & "find"(liberate!). In the case of aircraft too there's a record of the leader of a Hurricane squadron having a RR Merlin from a Spitfire fitted to his personal aircraft. In times of war it seems people tend to use what they can find to help ensure their personal survival. Having seen first hand how RhodAF modified their aircraft and mine protected/oddly armed
developed can vouch for that personally. So it seems that "poetic licence" when building a boat might be not that far from reality.
1 year ago by redpmg
Model Boat crew....
A model vehicle - car, boat or plane - looks a little odd if it seems to be operating with no driver. Aircraft have quite a selection of different scale 'head and shoulders' figures - road
seem to be made to standard scales so that driver figures are readily available - but boats are often made to a wide variety of scales and then need scale figures which are not readily available, and can be very pricey when they are!
I was asked recently about figures on the boats I make, which are continuations of the Keil Kraft EeZeBilt line. These were originally 'pocket-money' starter kits for young children, so they were very cheap, and the fittings were not bought, but made from available household items like paper-clips. I have continued that tradition, so making an EeZebilt remains cheap and encourages manual dexterity rather than a large wallet!
Figures can be made cheaply by adding filler to a wire armature, but this does require a bit of carving skill. It is easier to start with a basic shape and alter it a bit, and the obvious place to start is with a model railway figure. Cheap Chinese copies of products like the Preiser range are available on Ebay for around 10p per figure - see the link below for example.
These figures are available in many scales from 1:200 up to about 1:24. The first point to make is that choosing a suitable scale to build your boat to will make it a lot easier to populate it with figures! I typically look to make boats at 1:24 or 1:48, two common scales for railways.
Now the only problem is that the typical figures for sale are not sailors or naval personnel. Instead they are usually civilians, railway staff or workmen. But that is easily solved by using a modelling knife. I have illustrated this below with a set of drawings for a 1:48 figure - see the PDF link below:
1 - a typical figure. Note the jacket and tie lines embossed on the body. I wanted to make an Indian Naval Officer, so my first step was to look up the colouring and shape of their uniform. I find that they wear white, with either a plain-front tunic or shirt and shorts.
2 - To make a plain-front, simply scrape away the clothes lines embossed on the figure's trunk. You may also need to cut any hanging parts of a jacket away, or fill a hole with some modelling putty.
3 - To adjust arms, slice them off and then re-attach with Plastic Weld. The plastic will melt and conform to the new shape.
3 - To make shorts, just trim the long trousers in a bit at the shorts hem, then carve the lower leg to show the bulge of a calf.
4 - An officers cap is easy to make. Stamp out two tiny paper disks using a sharpened brass tube, and cut one disk in half. Cut a slot across the figure's forehead, and superglue the half-disk in there to be the cap peak. The full disk goes on top of the figures head, and the excess glue is drawn by surface tension to make a brim. The glue will soak through the paper and make it hard. See the PDF below for details...
2 years ago by DodgyGeezer
About ten years ago, I went on a cruise- and I loved it, BUT, it wasn't on one of the massive floating Las Vegas hotel things that claim to be ships. I went on the Norwegian Coastal Voyage, the ship, the Polarlys, carried about two hundred passengers and acted as a ferry between Bergen and Kirknes, right up near the Russian border calling at about twenty ports in each direction. The cruise lasting eleven days. We called at ports big and small, some we would just pull in, a ramp in the side of the ship would go down, a couple of people would walk off, a forklift would drive on, extract a few parcels, then maybe a car would drive on, then off we'd go. Others we would stay a few hours so that we could visit the town. This ship was regarded as a general ferry carrying goods,
and people up and down the Norwegian coast. I had breakfast with somebody one morning who told me had had come on board during the night and was going home on leave. He was captain of a ferry belonging to a rival company which did not call at his home. As far as entertainment, yes there was a singing duo in the bar at night after dinner, but that was it. The food was good but quite normal, none of the gourmet offerings of the big ships. The dining room was shared with the crew. One was often sitting at the next table to the captain and other officers. This was a cruise for the person who wanted to see the magnificent scenery at quite close quarters, we sailed just safely offshore the whole time except when crossing the entrances to the bigger fjords. This was a cruise I would recommend to anyone who wanted a wonderful experience, without the nonsense of the popular conception of a cruise.
1 year ago by Nerys
Brushed to Brushless upgrade
"....that is why I was looking at this thread with interest.
As I hoped to learn something!."
My thoughts about brushless motors...
- they are a different kind of motor, so they have different characteristics. In particular they need different ESCs.
- Their ESCs come with three cables. You can connect them to the three inputs to the motor in any order. If you want the motor to go backwards, simply reverse any of the two connections.
- you can get In-runners, which are high-speed ones. Out-runners are higher torque ones. There is a special type called 'Sensored' which can go very slow and are used for rock-crawling
, but they need special Sensor ESCs and are expensive.
- they are much more efficient without a sparking commutator to pass electricity through.
- they don't have tight limits on the voltage they must be run at. More volts = more speed, and hence power.
- they are happiest running at high speed. They don't much like trying to run slowly, and tend to start with a jerk.
- the main limitation on them is thermal. You can run them until the coils get too hot for the magnets to work (upon which they are fatally damaged!).
- you can get astonishing amounts of power out of quite small sized motors if you give them enough electricity and keep them cool. They suck up power from batteries given the chance, and high-output batteries like Lipos are ideal for them. If you use other batteries, check that the battery can output a lot of power - if it can't, the brushless performance may be disappointing...
- I find it is best to run them at low voltages (12V or less) at which point they don't heat up at all. The motors are often capable of running from 6v to about 20v...
- Rather than power, the motors are measured on size of can and KV. KV is the speed in RPM that each volt will produce. So a 1000 KV motor will do 12,000 RPM on 12V. If it is specced as a 2824, that means it is 28mm wide and 24mm long.
- Cooling is important, and hard to specify precisely. Depends on the power being used, and the cooling technology you provide. Most brushless are designed to run in aircraft where there is lots of cooling air. For boats, you can get cooling jackets for in-runners and cooling mounts for outrunners. Having some air throughput is a good idea - but hard to arrange on a boat... Unless you are sure that you are running well below the power limits, you should use a Watt-Meter to track the power usage rather than try to calculate things. This discussion may provide an idea of how to worry about brushless motor limits: