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>> Home > Tags > rc boat

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HMS Erebus by RNinMunich Sub-Lieutenant   Posted: 17 hours ago
Hi Gdaynorm (Why does that name make me think 'strine'?) 😉 Yes you are absolutely right Duratrax seem to specialise in cars & buggies. The Sprint always seems to appear in the context of the Evader buggy series, also it is listed as discontinued on the Duratrax site! ads/discontinued.html Nothing lasts for ever!! Maybe it is not happy driving two motors? What is the total current drawn? Since it seems almost certainly to be an overheating problem is there sufficient cooling air flow through the boat? Recycled 5V DC PC processor fans can be useful to help here. Since you can test motors by feeding directly I assume they must be brushed. Are your batteries, LiPo or NiMH? In both cases the Sprint has a low voltage cut-out. 3.3V for LiPo, 5.0 V for NiMH. Maybe the cut-out circuit has a hysteresis effect. This means that if the battery recovers slightly when taken off load, and cools?, the boat runs again - until the cut-out point (thermal or volts) is reached again! I would expect the interval between cut outs to reduce slightly with each cycle until the battery is totally depleted. This effect is also noticeable with sealed lead acid accumulators. I would be tempted to bite the bullet and buy 2 ESCs designed for marine use (e.g Graupner Navy VR series or Viper Marine or US/Canada equivalents) and a 'Y' cable to run both in parallel from one RX port. Then each ESC only has to handle half the load. And ensure sufficient cooling air flow, or even water cooling!? How big and heavy is the boat, what type are the motors and what size & type are the props? Cheers from Munich, Doug 😎

Battery problems by RNinMunich Sub-Lieutenant   Posted: 4 days ago
Hi Patto, forget the 'watt meter' and consequent P=IV -> I=p/V conversions! What you need to measure is the actual current drawn, especially the stall current, if you can manage that without getting any fingers chopped off 😡 On the lake anything can choke the prop so just testing 'free running' is not the whole answer. Sounds to me simply that your setup is drawing so much current that any battery or accu will go flat in a few minutes. Your example of a 5300mAH (i.e. 5.3AH) means that in perfect (!) condition, fully charged and almost zero internal resistance (int. cell resistance wastes power so buy the best quality you can possibly afford) it can theoretically supply 5.3 Amps for 1 hour. or 53 Amps for ~ 6 minutes (1/10 hour). and so no. LiPos with C values of 130 sound great BUT the discharge C value is related to the AH rating. So taking your example of 5300mAH = 5.3 Ah 130C = 130x5.3 = 689Amps! The Accu would supply that for ~ 27 seconds before departing to the great recycling centre in the sky! If you ever decide to try such an experiment PLEASE let me know in advance and I'll fly over the record the event for posterity 😉 Seriously though folks: I can't comment on the prop/motor setup, one of my weaknesses - I always check my stalled motor current draw with an ammeter before selecting the ESC - but as an electronics engineer I do have some idea about power supplies and circuit requirements etc. Can't imagine that your setup exceeded the 160A (short term remember!) rating of the ESC so that seems to be faulty, but you still need to find out what current your setup will draw under severe load i.e. stall. If just holding the boat cause blow ups then something else is fundamentally wrong 🤔 Bit long-winded perhaps, much of the above makes sense but not the whole story, time to cut to the chase I thought. MEASURE THE CURRENT! Good luck. Doug 😎 By the way the above comments about lead acid & hi current are OK. They are more useful for long term supply of low to medium currents. I still use them in some larger scale models (~ 1.5metre naval ships) as they provide useful ballast (i.e. payload) instead of JUST ballast! The 20HR of your lead acids refers to the Hourly charge Rate, i.e 1/20 of the capacity in AH, in your case 7/20 = 0.35A or 350mA.

Battery problems by Patto Chief Petty Officer   Posted: 4 days ago
BIG MISTAKE I brought a 5300mha -50c-14.8v-4s1p-78wh LiPo battery yesterday. Bloke in hobby shop checked my ESC which is a TURNIGY AQUASTAR Watercooled ESC 160A. and said that it could handle that size battery. Giving the boat a test run this morning the ESC erupted in a huge cloud of black smoke. Not happy Jan will be ringing the hobby shop in the morning. Allan

Make what you can and buy what you have to by Dave M Fleet Admiral!   Posted: 5 days ago
Hi Sonar I used to look round the local tip but it is now prohibited in my area (Cheshire). I agree many industrial sites have waste skips but as you suggest it's best to obtain permission before removing items. Another source is Freecycle where spare items are offered for free, but you do need to be quick as popular useful items are quickly taken. Another source are bring and buy sales at model boat shows etc.

How many is to Many by RNinMunich Sub-Lieutenant   Posted: 6 days ago
a REAL scary question 🤔 1 H class Destroyer and 1 Submarine KM IIA (1:72) in SLEP (Service Life Extension Programme!) 1 KM pocket Battleship Graf Spee & 1 HMS Belfast (1:128) in Fitting Out Dock. 1 Tug Southampton ca 1:50 ARTR 1 Kentish Fishing Boat ca 1:50 inherited restoration & motorisation project 1 Sea Scout restoration ARTR, built by my Dad 50 years ago! 1 flying boat ARTR 1 Hovercraft needing painting & RC gear fitting. Potential 'Plastic Magic' :- 1:350 Bismarck, USS Enterprise (The Big E), HMS Hood, HMS Ark Royal, Airfix HMS Illustrious (Invincible class) & T45 Daring 1:72 Revell Flower class corvette, German Lifeboat & S100 class E Boat, Airfix MTB, RAF Launch, KM E Boat 1:144 Revell Fletcher class destroyer. Have started collecting Micron Radio gear for the conversions. And JFF an Airship! Ready except for the Helium needed! Plus many 1:400 1:600 1:720WW2 navies plastic kits & etched parts JFF & to hone the skills I should live so long ! Help 🤔 Cheers from Munich Doug 😎

Sailing with Worcester Model Boat Club by cormorant Commander   Posted: 8 days ago
This is a re-issue of my previous post as the link to the video failed. It shows a Sunday morning's sailing at WMBC through the 'eyes' of my 46inch Perkasa. Details of the Club can be found here: https://www.worcestermodelboat

Emily P II by GrahamP74 Chief Petty Officer   Posted: 9 days ago
[Score: 6/10] 33" Emily P II Single Propellor (3 Blade 40mm) Geared to a Torpedo 500 (3 Blade) - Comments: Purchased this hull from Prelived for £35 and intend to create a fishing boat capable of trawling and netting. Scale will be 1:12 The black plastic is 2.5mm thick and has been used to give the gunnels some depth. There will be a layer of fibre glass applied. Updates as the build continues...

Worcester Model Boat Club by Johnlikessailing Commander   Posted: 12 days ago
Looks good thanks for sharing it.

Worcester Model Boat Club by cormorant Commander   Posted: 15 days ago
Thanks Dave M. Not a fair representation of boats, just those that happened to be there at the time. We have plenty of scale boats, including an RAF Crash Tender and warships from the South African Navy. You are more than welcome to visit our website gallery on the link below. Dave W, yes we welcome new members! We are a new club, still developing our sailing HQ. It's not County Hall as that has been closed for some considerable time due to an outbreak of blue/green algae bloom. If you follow the link to our website you will see what we are about and get an application form on line in the Contact Us section. https://www.worcestermodelboat Look forward to hearing from you Steve

Worcester Model Boat Club by rolfman2000 Chief Petty Officer   Posted: 15 days ago
Great video. A nice selection of different boats. Are you open for new members, as i live in Kidderminster, and would love somewhere to sail my craft. Is that County Hall lake ? Kindest regards, Dave W.

Worcester Model Boat Club by Dave M Fleet Admiral!   Posted: 15 days ago
Good video steve. You seem to have a good supply of fast boats as well as the odd yacht! Dave

Solent lifeboat gelcoat by Mataroa Captain   Posted: 17 days ago
I finally got the gelcoat on the hull and antifouling .you will see new outdrive that you not normally see on this type of model boat .They be use on RC boat . cliff

Jet Sprint Boat by Dave M Fleet Admiral!   Posted: 19 days ago
I purchased two jet drives for my Shannon lifeboat from https://www.kehrer-modellbau.d e/en/. Bit nearer than NZ for Europe. Dave

Jet Sprint Boat by Rod Lieutenant   Posted: 20 days ago
Have been trying to source a 1/4 scale hull for a jet sprint boat but not successful so decided to make my own Borrowed a small model identical to the one I wanted and set to scaling it up by 2.5 times I have shown the start of the journey and will continue to post development until it is in action Have sourced 1/4 scale driver and navigator together with jet unit and electric water cooled motor which will need to produce 3 to 4 hp to drive the jet unit shaft Hope you all like it because it's been really interesting so far I should be in a position to pour the mould shortly and then have a fibreglass hull taken off😆

Using old motors by Westquay Lieutenant   Posted: 20 days ago
Hi Dave, many thanks for your answer. I wanted a scale speed of 25-40mh, so much slower than the real speed of that figure. As long as they just about plane I'll be happy. I've been trying to get a Bob's board for ages. My old friend has a few in his loft. He used to make all the display models, aircraft and boats, for Bob's models. My R/C gear at it's earliest is Mini Hex from 1971 or Digimac. I can't get the REP single channel I once had, but which was stolen. I should say that my old Crash Tender (which I really should finish some time 53 years later!) always ran a treat with it's Supermarine Special, using said REP sytem. The Basset-Lowke motor is a permanent magnet type so will probably be OK with an ESC, but I have no idea what sort to use as I don't understand them. All I read seems to suggest that they are either expensive or unreliable. And they need "programming", which totally puts me off! I have no model boat clubs near here, so would just use the local canalised river which has both sides accessible and is rarely used by full sized boats. But at least I don't have to worry about other R/C users. Looks like the world is much the same for old motors after all. Cheers, Martin