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>> Home > Tags > servo

sail servos
steering servo
Dolphin 16 (19) by AllenA Commander   Posted: 4 days ago
[Score: 7/10] 19"/1100g Dolphin 16 (19) Capable of 10mph and a runtime of 20mins Single Propellor (3 Blade 30mm) Direct Drive to a Graupner Speed 600 8.4v (3 Blade) Powered by NiMH (7.2v) 3Amp/h Batteries Controlled Through Chinese 320amp (10Amps) ESC - Comments: This is the Meccano Magazine January 1967 issue plan, built in balsa. I didn't do a build blog as the construction is well covered on the net. Started with an A4 plan and used Excel to enlarge it onto 9 A4 sheets. I chose something simple as I haven't built a boat for thirty years. Really enjoyed the build and re-learning how to overcome the problems that always arise. She is oversized being 19" long and having a 7.5" beam. She sits nicely on the water and begins to plane. Will upgrade the the battery sometime. The decking is worktop edge strip pre-glued but in future will use the unglued strips. The cabin was adapted to extend over the whole boat as there was little space for modern electrics. I will add in and out air vents as the motor will need to breathe. Also, the true model should have an upper deck and windscreen and this will be easy to add sometime in the future. Really surprised and pleased with results from aliphatic wood glue. The finish, which I am not completely happy with, due mostly to my own impatience, was achieved with Ronseal multi purpose wood filler, lightweight fibreglass laminate with Eze-Kote. Paint is Acrylics and Marine varnish. The electrics are: Acoms AR 201 Reciever, Servo Acoms AS 12, Cheap Chinese ,supposedly, 320 amp ESC and 7.2v Nimh battery pack. The Graupner Speed 600 8.4v, bought it cheaply some months ago, was already in one of my boxes and you can see the adaptation required to fit it into the boat. All the Acoms controls I picked up at a boot sale including an Acoms Techniplus Alpha Transmitter on 27mhz. Inside I used Hammerite Smooth Gold as I couldn't buy silver. Modern Hammerite is thin and squeamish and took 3 coats to provide reasonable coverage. One final rant I do like the new silicon wires but they are a nightmare to solder to a motor. I think I will use soldered connectors in future. So there we are, first model in 30 years and now so many models to build and so little time. Lessons learned...... don't be impatient.

HMS Juno by lindsay Seaman   Posted: 10 days ago
[Score: 5/10] 29" HMS Juno Capable of 3mph and a runtime of 40mins Twin Propellors (4 Blade 15mm) Direct Drive Powered by Lead Acid (6v) 1Amp/h Batteries - Comments: It started off as a model from a BBC hobby magazine. Stand off scale. I decided to try to make it better so bought an Airfix kit and scaled up the dimensions to suit. it was my first radio control model with a Mcgregor 2 channel radio and a resistance speed controller attached to a servo. the photo was taken at Queens Park Glasgow in 1990 although the model was built in the 1970,s I no longer sail her as age has made her somewhat delicate. The hull is Balsa plank on frame covered with Tissue Paper Doped and painted.

Sea Queen refurbishment by colinhubbard Fleet Admiral!   Posted: 12 days ago
Well just got the Queen back home, it looks quite good, (big relief) as all paint and varnish has gone as well as the oil. Just stained where it had been, the epoxy I had used to stabilize the outside of the hull hasn't been affected, so tomorrow I will coat the inside to make sure that all seems are sealed before fitting the mounts for servo, motor, ESC? And radio. Then applying a coat of Hamerite smooth white. Hope to get my PC back next week then I can upload some photos. I can't decide which motor to use, 600 motor or a 6volt geared decaperm. Any thoughts would be useful. Thanks Colin.

Skimmer from Mobile Marine by Dave M Fleet Admiral!   Posted: 12 days ago
Hi Chris Mine just has a large flat ply plate over the bottom of the hull with the rx rudder servo and battery fixed in place. I use velcro for the rx and made mounting blocks for the servo. An aircraft snake connects to the rudder. The battery is in a small wooden compartment. My ESC is just below the motor mount hanging loose. You do need to strengthen the motor mount - I used lots of wood inside to make it all less pliable - the plastic is not strong enough on its own. You need to build a plinth to attach the motor high enough to attach your prop. This need to be well braced to take the thrust from the prop. Mine moves slightly and if I were to make another I would make it stronger. Mine required two small sheets of lead up front to keep it on the water at speed. Please post details of your build Dave

Skimmer from Mobile Marine by octman Commander   Posted: 12 days ago
I have just purchased the hull and deck from Mobile Marine Models of their Skimmer air-boat. Any out there got any info regarding the build of this? Mainly, is there any internal construction to do, to accommodate the receiver and servo etc, and to give it a bit more rigidity? I have a motor on order following Dave M's advise, and I have some ideas regarding the mounting of this and the steering arrangement but just not sure about the insides. Chris

Experimemtal by tysonyoung Petty Officer   Posted: 13 days ago
[Score: 5/10] 72" Experimemtal Capable of 11mph and a runtime of 120mins Powered by Lead Acid (12v) 7Amp/h Batteries - Comments: Ebay Purchase. Originally a test tank model. Pumped water ballast no rudder or keel. Now fitted with lead fin ballast plus 2 7ah gel cells. and auxiliary motor. Sailing rig "A" class . 72in long 32 in beam .Hull strip wood deck fibre board. Sail winch and heavy duty rudder servo fitted. Design guess work !! Note picture of setting up rudder. 3 years work.

Smit Nederland no 528 by Dave M Fleet Admiral!   Posted: 13 days ago
Hi Brimarboat Just looked on The Billing website and this model is advertised as: "All fittings included (e.g. position lights, anchors, life-belt, etc.)" They do sell all the electrical bits like motors, couplings, servos and Rc but the fittings should have been in the kit. Not sure of the scale but the measurements suggest 1:32 so you should be able to source suitable fittings. If it was a local shop I would be asking them to provide the missing parts Dave

Servos & motor having a wobbly by RNinMunich Fleet Admiral!   Posted: 17 days ago
Hi Eric, guess we kinda assumed the battery had been checked / charged! 🤔 Main thing is you're up and running 👍👍 Cheers Doug 😎

Servos & motor having a wobbly by EricMB Lieutenant   Posted: 18 days ago
Hi Doug and Dave, very sorry for the radio silence, day job getting in the way! Really appreciate the input, interesting to hear about your experience with the progress of technology, I guess in using digital RX and TX setups there are different issues that arise! So, to your kind advice - I unplugged the servo Dave, and no difference, which made me think it was the motor. I disconnected the ESC (and hence the power), added a battery input to the RX and all was ok! That made me realise that the power section was the problem, confirmed by a suggestion a fellow model Boater made about checking the battery - instead of chucking out 7.2v, it was giving about 5.3v! Recharged and hey presto - problem solved! Flat battery giving out interference!! Here's the system now behaving as it it should; Thanks again for all the help and advice - very much appreciated. Regards, Eric

Servos & motor having a wobbly by RNinMunich Fleet Admiral!   Posted: 19 days ago
Hi Dave, Exactly, If it ain't broke - don't fix it! 👍😉 Will get some experience of current kit on my Sea Scout upgrade - A Quantum leap from Taycol to Brushless 🤔 Weather same here, ca 30°C 😎 with intermittent thunderstorms expected from tomorrow 😡 Cheers Doug 😎 PS The sub outruns many 'speed' boats, long and thin with plenty of Oomph! 😁

Servos & motor having a wobbly by Dave M Fleet Admiral!   Posted: 19 days ago
Hi Doug Progress especially with anything electronic moves at lightening speed and our PCs are almost obsolete as soon as we buy them. I suspect your sub like many of mine has kit sourced from an earlier period and I can well remember all kinds of suppression aids we used to have to use especially with our cars to suppress the interference from the ignition! I suspect it is only the modern high frequency ESCs that will have a problem, earlier kit used discrete chips that used much lower frequencies for the pulses. The original chips used became unavailable so manufacturers had to adapt to what was available. If your sub works OK I would leave well alone. Eric's problem could well be motor related but could also be from a faulty servo, my suggestion to unplug the rudder servo would eliminate this from the equation, but I am awaiting a response Sun's back but thunderstorms promised for tonight! Happy days Dave

Servos & motor having a wobbly by RNinMunich Fleet Admiral!   Posted: 19 days ago
Hi Dave, I guess you're right! I obviously have more catching up to do than I thought 🤔 Re your question - if you mean my sub it has no interference problem; RX is in the bow, motors and suppression boards in the stern as in my pics. Two big 4AH 'lumps of lead' in between! I simply wondered if Eric's problem was due to interference from a cheap motor in the outboard. I have taken a couple of these apart (from inflatable boats) and the motors are pretty basic with little or no suppression. But if he's using a hi freq. ESC then chokes are probably not the solution. I that case I might go back to a simpler ESC myself! Cheers Doug 😎

Servos & motor having a wobbly by Dave M Fleet Admiral!   Posted: 19 days ago
Hi Doug I well remember these chokes and that capacitor. I do believe modern thinking is to wrap the low current wires to the ESC round a circular choke, there are never any chokes in the supplied ESCs motor leads. I do recall advice on one of the forums regarding not putting any inductance in the motor leads, not sure if it was Electronize or Mtronic who gave the advice. They both adopted high frequency pulses for control a few years ago and there was lots of discussion as people upgraded their old ESC to a new one. Chokes were quite common in the past but the technology was vastly different to that used by modern ESCs. Are you sure the interference is from the motor? I had a very similar symptom with a faulty servo, very similar to that Eric is using. I have asked him to unplug the servo and see if the problem goes away. So far I have not had a reply so can only guess what might be the problem. Cheers Dave

Servos & motor having a wobbly by RNinMunich Fleet Admiral!   Posted: 19 days ago
Hi Dave, interesting thought with the pulses! 🤔 My sub is working fine with a 40MHz RX Pico receiver and Graupner Micro Speed 10 ESC. Could test it with my Viper Marine 10 I suppose!? Otherwise Eric may have to go back to a 'simpler' ESC if he can't suppress the outboard at source. Current capacity depends of course on the wire gauge used for the choke. The ones shown in my sub were designed to handle at least 15A as far as I can remember! Eric's outboard can't be that thirsty. Cheers Doug 😎

Servos & motor having a wobbly by Dave M Fleet Admiral!   Posted: 19 days ago
Hi Eric Have you eliminated the servo as the problem? Doug, won't your choke interfere with the high frequency pulses used in modern ESC's? and is there a max current capacity for the chokes? Dave