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February 2019: 8 people January 2019: 16 people December 2018: 6 people November 2018: 11 people October 2018: 9 people September 2018: 13 people August 2018: 5 people July 2018: 8 people June 2018: 8 people May 2018: 7 people April 2018: 9 people
I'll probably go for a laser cutter in the end. A big CO2 one - but these are powerful tools, and i'd like to have a reliable cutting bed before experimenting with something that might cut the shed in half! The obvious answer is to use some driver software that does handle tool radius compensation - I understand that the Tiny board firmware is now open source with a new name - G2Core. I think it needs a bit more poke than an Arduino Uno, though. I intend to simply slot sheets of balsa into it and crank out kit parts - which means a single pass cut. One issue is how to hold the sheet of balsa down without interfering with the cut. I was wondering about a vacuum base. If you want to observe a laser cutter safely, I hear that the Yank modellers are sealing them in enclosures, and viewing progress through a webcam, which is one answer....
I've been trying different configurations for controlling the sails. Finally settled on the winch circular method and managed to get it installed and calibrated. My tether broke the other day. Fortunately, a kayaker came along and graciously retrieved her for me. So I decided it was time to go ahead and add a motor. The drag of the tether was affecting my ability to get control of her. After a few failed attempts, I was able to come up with a configuration that works. Probably way overpowered but I had a spare motor from a defunk helicopter sitting around. AND finally, the beauty of her markings are back. I found a source for new labels (much easier to apply than the original ones that were water based).
Is there any members on this website who are interested in marine gas-powered steam engines, as the power source of their model boat, as opposed to electric motors. If so could you drop me a line as I would be very interested in making your acquaintance. I have never seen anything at all to date concerning steam power, which is rather a shame as it's the nearest thing to the real thing, and you don't have to shovel coal, use gas.
It's a great shame that Maplins have gone, they were once a good source of electronic components but in later years turned into more of a 'toy shop' than an electronic hobbyists shop. The high power LED is nevertheless available from Hobbyking but the lense will prove more difficult to source now. Midas Components in Norfolk used to be an importer of the 'HJ-HPH2' lens and I also found this after a quick Google: https://www.tme.eu/gb/details/hj-hph2/lens/huey-jann-electro... The 'Peter Jones' mentioned could be the chap from the Dragons Den programme? I'm very flattered by Doug's epithet 'King of Crash Tenders' but it is undeserved and should be attributed to the likes of Paul Devlin (pmdevlin) and the late Peter Henshaw (HS93) both from whom I took great inspiration, (and stole lots of ideas from 😜). It is nevertheless very pleasing the the Crash Tenders still appeal to modellers who want to make them and detail them as much as Mike Turpin here.
My Cervia was ready built. I have replaced the Electric motor with a large servo motor (Brushed) .Direct drive and being heavy helps with ballasting. lead acid gel cells are power source. Motor rated voltage24 v but run it on 12v . low rev high torque no load current 1 amp. Shaft diameter 0.5 in. Gives some idea of power out. Being servo motor (ex computer drive 30 years old) well balanced no vibration. Photo near shore shows power of motor.
I have built a few of Vics plans and found them very easy to construct. He does build them a bit heavy an underpowered but.....they are solid and safe.......Starlet, Hydro bat, Scudder And currently got the Zing Ray under construction. The Starlet is a dream to sail. Hydro bat very fast and very responsive to water rudder input. A favourite with the grand kids. Scudder looks quite weird but it lives up to its name. Grandkids love this as well. Another water rudder model. If these are used in really weedy lakes the rudder will pick up some trailers so i have fitted a 3mm rod running from mid keel to lower rudder pivot point. The weeds simply slide off. The Zing Ray is a shovelnose hydroplane still under construction. The biggest source of quite a bit of discussion is the conversion from ic to electric. Using a base of 3.5cc produces 400w or about 1000grams of thrust, these models seem to work ok. And yes i am a Vic Smeedfan 🤓
[Score: 5/10] 22"/600g Christian Radich - Comments: My model of the Christian Radich a Norwegian full-rigged ship. I don’t recall the manufacturer’s details of this model kit but I believe it was of Spanish origin. Construction of the model is a double plank hull and deck with most of the small fittings being supplied in the kit of parts, the build time was 680 hours. The vessel was built in Sandefjord, Norway and was delivered on 17 June 1937. The owner was The Christian Radich Sail Training Foundation established by a grant from an officer of that name. The vessel is a full-rigged three masted steel hull, 62.5 m long, with an overall length of 73 m including the bowsprit and a maximum width of 9.7 m. She has a draught of about 4.7 meters and a displacement at full load of 1050 tons. Under engine power she reaches a top speed of 10 knots, while she can make up to 14 knots under sail. In 1939, the ship sailed across the Atlantic to visit the World Trade Fair in New York. The ship and the voyage created huge press coverage and made Christian Radich famous. When the ship came back home in September 1939, she was taken over by the Norwegian Navy. After the German invasion, the Nazi’s used the ship as an accommodation ship. At the end of the war, Christian Radich was towed to Flensburg in Germany where it was later bombed and sunk. At the end of the war, Christian Radich was hoisted up and towed to Kiel with a minesweeper as a protection ship. She was later towed to Norway and fully restored in 1947. There is a rich source of information about this beautiful ship on the internet if anyone is interested to learn more about her.
post up a pic of the orange rx, lets see what version it is. EG, I have a DX8i which will work with both dsm2 and dsmx, I bought it for this very reason, so I can use both. You keep saying that the tx needs to be found to be faulty or not, but as Doug says, if you don't have it in the correct format to match the receiver, its never going to work. Spektrum are reliable, so I doubt the tx is faulty BInd plug in receiver power source to receiver, orange light flashes quick (make sure its 6v, if you are using less it might not work, so think about this, I use a 4 aa pack to test things like this, last night doing exactly the same could not get a bind, the 4 aa's had dropped to 5.5v, change the batts, 6v all worked) hold tile trainer switch, turn on tx at same time keep hold of switch, wait a minute or so, light on rx goes steady. TX neds to match the rx, dsm2 or dsmx sorry if I'm repealing things, failing hat go to local rc boat, or plane club, and ask someone to second face what you are doing
Evenin' Rowen, So far so good, nice job👍 Let me go through your comments one by one😉 1) "Moved the battery towards the stern and, at speed, the forefoot lifts slightly clear of the water. The plane is now almost flat. The battery is not well positioned when near the bow." Battery in the bow is almost always bad news🤔 too much weight forward of the CoG or natural balance point when planing. 2) "The 2S battery used was a 4000mAh 30C; suspect this battery does not have the capacity to operate the model. Every motor will run up smoothly until a second one is operated. The first motor then “stutters” and a fuse might blow, this could be indicative of a power surge. Any comments from the electronic experts among the group would be appreciated." First the battery: you may be right. Especially with 3 x4500 kV motors Since you are using 3 ESCs how about feeding each one from a slightly smaller (lower weight) battery? Precondition of course is that all three are equally charged to the same voltage and capacity AND have the same (or very very similar) internal resistance! Complicates the issue of course and motors with a lower kV rating and one power source may well be the better solution😉 Second the 'stutter': How and when did you switch in the second motor? If the first was still at 'Full Ahead', i.e. 'Pedal to the metal!, I might expect the battery voltage to dip and then recover with the sudden additional load and a sharp rise in total current drawn. But no particular excuse for a sudden current rise in the first motor ! Where was the fuse that blew? I suspect in the primary supply lead from the single battery🤓 since with brushless motors you can't fit individual fuse in their supply leads like you can with a brushed motor. BUT you can to the ESCs feeding them!!! You can't get a power surge from a battery, not like a surge on the mains network due to lightning etc! But you can get a voltage dip and recovery if you suddenly present it with an additional load😲 3) "The 3S battery was 10,500mAh and 40C; with this battery all three motors can be run at full speed together and fuses do not blow. It was also very heavy at 1700g, holding the model down." All run up together to full speed or 'switched in' as described above? There's a big difference between a gradual increasing of load on a power source and a sudden step increase! 4) "The motors are 4500 kV. On refection, think a slower motor around, perhaps 2000 kV would have been a better choice." I did think at the outset that 3 x 4500kV was perhaps a little ambitious😲 2000 - 2500 sounds much better, and more controllable👍 Then you could also get good performance results with a single battery of capacity lower and weight 👍 The function of the third (centre) motor for 'action speed' would also be more pronounced👍 5) "Would concur with comments by others that a simple single or two bladed propeller layout for this model is probably best - that is unless you want to capture the true scale layout. The centre propeller seems to have little effect on overall performance, (see above re 4500kV motors- Doug😉) although it will power the model quite nicely when operating by itself. Have had several suggestions about how best to use the centre propeller. Will think about them and decide later how to do this when I start to finish the model." As a 'Scale Purist' (as far as my skills and tools allow!) personally I would frown on the use of 2 blade props, much less only a single prop. Do that in a fictitious power boat if you will, but for 'Brave Borderer' ? 😡 Do her justice please😉 Many three screw (😲) boats (including the full size originals of this era) only used the third motor for additional manoeuvring speed in action situations. My personal experience of FACs (Fast Attack Craft) and FPBs (Fast Patrol Boats) over the last three decades shows me that the three screw configuration has been largely dropped, especially since the introduction of much more powerful engines such as improved diesels and gas turbines. Many use a combination of diesel, for cruising, and gas turbine for 'action speed', so called CODAG, COmbined Diesel And Gas turbine. 6) "The 2 blade Hi – speed propellers both increased performance and current draw. The model is more than fast enough with the original scale layout." As I believe the 2 blade props were of larger diameter (and perhaps also of larger pitch) than the 3 bladers the higher current draw is a logical conclusion! Stick with the scale config! 👍👍👍 7) "Will purchase a lighter, 3 S battery as that seems the best choice for performance and weight." 👍 but don't overdo it to the other extreme by reducing weight and therefore capacity too much😲 You want a decent sailing time don't you? 8) "Testing using the bare hull with a minimum of detail worked well. For a models with a complex power train, this is a good approach as access to the internals can be gained easily. Nothing worse that finishing a boat carefully just to find the performance disappointing. Then having to to rip it apart to make major modifications or adjustments!" Heartily agree 👍👍👍 Bon chance mon ami😊
After a time away due to illness and other family issues, I am back to the build of the NAXOS. By accident, I think that I have obtained a suitable power plant for her - it is the motor out of a cordless drill which I can no longer get a battery pack for. Aparently, it runs on 6V to 60V. Wondering if it will require water coolong or not. If so, how does one arrange a "water scoop" for the cooling tube and where is the discharge sent to? Maybe a port in the transom..... As you can see, it has a pinion gear on the shaft and I don't know if I should leave it on and incorporate a prop speed reduction gear or remove it (with heat) and go "direct drive" coupling to the prop shaft. I have a plan for the ESC with BEC and as I love building electronic devices likely will go with "home brew". I am a boat building novice so constructive input appreciated. Have located a source for wood construction material, so hopefully will have something to show next time.
Thanks all for the responses. Donnieboy - have thought out the plumbing, which is simplified by using a cooling pump. See future episodes! Doug - appreciate the concern regarding the red ESC wires. Have been trying to understand the rationale behind that theory. If all ESCs share a common input voltage, i.e. from one battery, what would the connection of multiple red wires do? Can understand if there were several unique power sources, but that is not the case here. Perhaps with your electronics background you can explain. Colmar - Used the angle on the scale drawing. If it were good enough for Vosper, should be good enough for me! Think it close to 7 degrees anyway. Think short shafts with oilers should help. Have heard of bushings running dry and seizing with these high speed motors. The initial props are scale versions of the originals. Rather suspect they will not prove to be ideal. Have purchased some 2 blade racing style props for a future test. They have a much coarser pitch and are designed for high speed motors. Intend to use plastic props initially as they are cheap enough to experiment with. Perhaps others have a comments on the cavitation question?. Incidentally, this is my first high speed boat too, but there is much of information on both this web site and Model Boat Mayhem for guidance. Posting questions always generates useful information. Look widely though at all types of fast models, MTBs, RAF launches, E Boats etc. - it has all been done before!
BTW: a 3V supply will only work for one LED, or several in parallel which complicates the wiring. Each LED in series drops from around 1.8 to 3.3V depending on the type. Typical average is 2V and 20mA current, so for your 3 LED running lights you would need a - 150Ohm resistor!!! Yes 'minus' 150 Ohm.😲 If you find one let me know and DON'T TELL DONALD😉 What voltage is the main power source, i.e. drive battery? Doug Posts crossed 😉 Just wondered if Brooklyn might have had a stern light set into the stern gunwale. Have seen that on tugs in Hamburg.
Hi Biggles. I am at a very similar level to you. I am seeking help from the kind members so that I can improve my skills. I built this boat in 1993, which by the way, I had no idea about until I removed one of the life rafts to find I had painted the completion date on the bottom. I am currently stripping the paint and trying to get advice on the painting method. At present I am tending to favour air brushing Revell aqua paint but I am open to other views. As for the spray rail, my boat has never gone fast enough to need them. To be clear, is this the rail around the joint between the hull and deck which my boat has. Told you I was a beginner as well. With the more powerful motor, anything that keeps water from the electrics must be good. The gun was supplied by Battlecraft in Bideford. It is in 1:24 scale. I have just purchased a 40mm Bofors for the stern. Nothing like a lot of weapons. Perhaps I should have some torpedoes one day.😁 I have just bought a 3648 1450kv motor from Hobbyking for mine. I am advised that this will sort out my slow speed problem. I have also been advised to fit Lipo batteries. I probably will once I get over the thought of a large fireball on the river or in my house during charging.😉 Would love to hear how the renovation goes. I am considering starting a build blog as it might be a good source of gaining extra knowledge. I am not sure if a restoration will be ok on the build blog so I would appreciate if a member in the know could comment on this. Work keeps getting in the way of my plans but one day!! Peter.😊
Traditionally, when powering a Rx from more than one source, such as using a BEC circuit and a separate Rx supply battery, the positive power feed from the ESC is disconnected. This avoids the double power feed. I am embarking on a triple hand screw model with 3 x ESCs so each screw can then be controlled individually from the Rx. In this situation, where all the Rx power will come from ESCs running off the same main battery (using the BECC), with no separate Rx battery supply, is it necessary to cut all the positive ESC supply leads except 1? Appreciate any advice. Thanks Rowen
So following a long away week-end of Astronomy, now trying to get a bit further before going away for a couple of days. As I start to wire up the power circuit I realise how important it is to think things through first! Made up the link from the Battery to a ‘choc block’ distribution point which for space reasons is under the ‘control’ platform which will fill the bow area. (Pic 1) The fuse boards were obtained from Component – shop.co.uk Ltd in Bangor which is a good source of all sorts of electrical bits for us and is in Wales! (Pic2) The Dual Esc/Mixer, from the same place, a P94 9Lite), I have secured with Velcro (Pic 3) and I hope to keep the battery on top of this with a little air gap. It is at this point that I really came to appreciate the space limitations (Pic 4) and I do not have the motors wired in yet which will have fuse boards on the ‘platform’. (Pic 5). Next time hope to wire in Motors and Fuse Boards, Sound Generator and Receiver. Then see how it sits in the bath.....! NPJ