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Test fit the Rudder! by RNinMunich Fleet Admiral!   Posted: 1 day ago
Mornin' All, Hi Dave, yep, I thought about that as well but wondered if the prop tips might then get too close to the sweep of the keel to the hull! My experience with brass washers on rotating parts is that they wear much faster, and if you file them they can themselves end up working like files🤔 I would go for stainless. Rowen: basically agree about the nylon, although we are not talking power boat here so it shouldn't be too stressed.😉 Happy shopping Ed. Cheers Doug 😎

Too Powerful Brushless ? by pmdevlin Fleet Admiral!   Posted: 6 days ago
I think you might need pointing in a direction, so I had a quick look on Hobbyking, and this motor is the sort of thing you can use, although this particular one would need you to swop the shaft around, this is just a guide, other s will no doubt add comment, its the right size, 5mm shaft, right kv and watts. brushless esc you don't need the high amp capability, but its reversing, programmable, water cooled, and has an sbec, so the main battery power this 5 mm shaft, move your motor to the centre section meaning weight distribution is more central, and you can now use a shorter shaft, and get a couple off plastic "x" props, I would say 40 to 45mm will be the one. This will give a good speed, and you can power on 3 cells or 4 cells lipo, get higher c rating (40c or more) and higher mah so you have fuel in the tank available This is just a guide, a starting point, as I feel you are unsure where to start, others with more knowledge will come in regarding this, having experience with lipo, brushless, 3 foot ply boats, and esc's, depending on budget, this would be the sort of thing I would be getting.

Too Powerful Brushless ? by Traiderman Sub-Lieutenant   Posted: 6 days ago
hi Dave M, well that was good info on the Lipo's i was going to put them in Parallel But certainly won't now! i will use one and then swap over when necessary as you suggest,Thanks! As far as the 500 watt motor is concerned, i have not purchased it as yet but as a previous post stated that i need a smaller wattage than 500 , i will carry on looking for a smaller wattage and low KV size motor, although all i seem to find are are very powerful ones! even on the web sites named in the post but i will phone them in the morning and ask. the Boat does have a keelson, a piece of angled wood below the hull and also one inside the boat and this shows about 1 1/2" of tube either end of the shaft to fit the supports. Thanks graham

Too Powerful Brushless ? by Dave M Fleet Admiral!   Posted: 6 days ago
Hi Graham If we are talking about the Graupner Brushless Speed ​​500 ECO no 7295 then yes the Kv is 500 which equates to 7500 at 14.8v. It's 50mm x 80mm with a 6mm shaft so really a heavy duty motor and in a Aeronaut Queen 36" still much too big and powerful. You really need to resolve the drive train and shaft problems and this will be easier if you choose a motor of smaller diameter and power. A 36xx or very similar size motor at about 1000Kv or less (500Kv with 14.7v) will be ample. The prop should be less diameter than the motor. There are many examples of 36" model boats on this site and I do believe the majority of our members have used similar set ups, to those we have suggested, in their models with a large degree of success. It could be we are talking about a different motor as you refer to " the small outrunner motor". If so please post a link to a pic of the motor.

Too Powerful Brushless ? by reilly4 Commander   Posted: 6 days ago
Hi Graham, There have probably not been any answers so far because we are most possibly speechless. If you go back and read through the comments above you will see that most of the problem has been the large overpowering of your boat (1690 Watts - according to info provided by DaveM), coupled with an inadequate drive train. So with all this knowledge available you have asked our opinion of the Graupner 500ECO - one of the largest motors in that range. This is quoted at 1440 Watts. This may not rip the drive train out as quickly as the other motor did but has enough torque to do so. In my opinion I think you could try a motor producing under 500 Watts and see how that goes - with a 5mm shaft.

Flyer 15, racing hydroplane by boaty Commander   Posted: 8 days ago
Really lovely model. What power unit are you considering ? I can picture this boat with small brushless performing at scale speed and attracting a lot of attention.😁 BOATY

Midhurst Model Engineering Exhibition February 2018 by ads90 Commander   Posted: 9 days ago
It was a really good show yesterday at Midhurst with Basingstoke, Phoenix, Swiss Cottage, Portsmouth Model Display Team, Portsmouth Power Boat, Selsey and Springbok model boat clubs to name a few. A good many visitors and good camaraderie between clubs, so good all round exhibition which also included great model train layouts and the fantastic Meccano modellers. Here's to next year guys.

Too Powerful Brushless ? by RNinMunich Fleet Admiral!   Posted: 14 days ago
"The max current is the Max Watts divided by the Battery Voltage." Hmmm! Dave, I=P/V works fine for DC and static resistances but it gets much more complex in a dynamic system like an AC motor, which is all a Brushless is. Don't want to get into rms and power factor and co here so I agree the wattmeter is the way to go to find out what's really happening. Normally (at least here, not so sure with China!!) the max power output is quoted at nominal voltage and max efficiency. If you (can!) trace the motors back to the original manufacturer they publish performance graphs showing efficiency, power vs current and volts. But who does that? Except nuts like me😉 According to the DC formula the ECO 600 would draw 131A at 11 Volts or 97A at nominal 14.8V. The real 'Black art' is then to work out what power you want/need for how much thrust, acceleration and top speed for a given boat and hull type🤔 Best way is to ask those who've 'Been there, done that'. That's why I appreciated very much Canabus' advice when I was looking for a brushless for my Sea Scout upgrade👍 Happy sailing all - Whatever pushes your boat! Doug

MAGGIE M MODEL BOAT FOR SALE by Nev01 Chief Petty Officer   Posted: 14 days ago
Selling my Maggie m model boat this is truly a first class model of a local fishing boat based in Scarborough ! The detail on the boat is outstanding and correct in every detail. It has all new electrics , a powerful motor. It sails beautifully , all you need to get it sailing is a battery and a receiver that is compatible with your handset. Excellent boat will give hours of enjoyable sailing :) cash on collection only £395 Ono

Too Powerful Brushless ? by reilly4 Commander   Posted: 14 days ago
Graham, I have attached the same table that Doug sent me. This has the relevant information you seek. According to the table attached the Graupner 500 kV ECO has a specified output of 1440 watts and 80Amps. Strangely the 400 kV ECO has a specified output of 2010 Watts. So the 1440Watt output is questionable and may be a typo based on the other entries in the table. more likely to be 2440Watts In any case you need a 5mm diameter propeller shaft. For shaft alignment i use a brass tube that slides snugly on the propeller shaft and then on the motor shaft. When the tube rotates/slides well on both then the shafts are aligned. I then fit the motor mounts, check and tweak the alignment if necessary, remove the tube and replace with a universal coupling. If the motor or propeller shafts are a different diameter then I insert the relevant size smaller tube inside the larger of the tubes. This method is simple and has served me well, including for larger IC engine powered boats belonging to friends. Haig

Too Powerful Brushless ? by Traiderman Sub-Lieutenant   Posted: 15 days ago
Hi All, a lot of info, i need a complete change to the power train setup. canabus setup looks good, i think i will follow that. what size in diametre prop shaft did you use, 4 -5 mm? have uploaded some pictures of the boat, complete with offending motor! and 1 of the resulting damage to the 3 blade brass propeller, which i think was out of balance, so, can't take the speed of rpm? probably need a racing propeller? There is room for 2 lipo's in parallel. Thanks Again Graham

Too Powerful Brushless ? by BOATSHED Admiral   Posted: 16 days ago
I always use as smaller rudder as I can get away with. I had been running model boats for many years then one day when on Blackheath pond someone was watching my boat and remarked on how it turned. badly, and I replied that's how it had always turned. The guy had a boat the same as mine it was a MFA Spearfish, He asked if he could swap rudders on my boat and try his on my boat so that's what I done and it performed much better on the water. I then tried it on my Vosper RAF Crash Tender and it just stuck to the water on any turn tight or wide. So I have done this ever since. On my Huntsman I had turned it over several times before trying this so I done the same on this and once again it was a lot better turning and didn't turn over. I don't like using large rudders if I cannot get one small enough for what I wan't I will get one and then cut it down. We used to race 5 or 6 boats on the water at a time and always needed to turn tight turns to get round the pond. Even watching Power Boat racing on the telly in the past they make tight turns to get round. I have a Probaot Miss Geico tunnel hull and straight from the box brand new the rudder on that has no leading edge and I can turn that flat out on the water with no roll at all. I suppose I am a speed freak and it has worked fine for me. Even if it is the wrong thing to do. The small avatar picture on my posts is a boat I have in Norfolk. This has a 1960 Volvo Penta outdrive probably one of the earliest one's made and that doesn't like to turn on 3/4 throttle without the engine revs dropping and digging in on a turn. I have tried this when out on open water up there. Don't try it now as got a warning from the Norfolk River Constabulary. Don't want to loose my river licence.

Too Powerful Brushless ? by Traiderman Sub-Lieutenant   Posted: 18 days ago
hi all, i have a problem with my prop shaft, every time i start the Hobbyking Brushless 3660SL (3180 KV ) the prop shaft comes adrift from the boat hull. it's powered by a 14.7V Poly Lipo battery. is it too powerful for an Aeronault Queen 36"? or is the prop shaft vibrating because of out of balance propellor or the coupling? i have used Heavy Duty Araldite to glue the prop shaft on to the boat. it has come adrift 2 times now. Thanks for any help i may receive - Graham

Riva scratch built boat update by Alan999 Lieutenant   Posted: 20 days ago
I launched her yesterday and she went well. No ballast was needed and I put a 9.7 battery for powering. She is very fast and two weeks time will go on the boat clubs water in Torrevieja,

Fairey Huntsman & Swordsman by pmdevlin Fleet Admiral!   Posted: 1 month ago
I dont uses mixes, but do use exponential and rates (spektrum dx6i) with my twin screw brushless 4 foot fireboat. When at speed rates on, then it turns nicer, no roll, when going slow rates off so turns are sharper, if that makes sense. Mixing the throttles.. interesting not thought of that, but it will lose power/speed. We use mixing on planes for taxiing, particularly on water, but once airborne its off. My avatar has this as the cheapo motors just wont balance so it compensates for this on the water. With the boat its easier to control with rudder input. I like the thinking though!😁