Hi Doug, thanks for the info. I'll try all that this coming weekend. I'm pre-occupied with grandson and getting the cylinder heads done on the Vincent master pattern currently. That's been around for a year now and is very near completion, so I tend to keep weekends for my stuff only. I'll take some pics. of my ESCs for you. One small one is a Simprop 18Amp. That much is printed on it. So, I assume OK for a smaller motor. The others I don't even remember getting. But I have often been sent stuff as a thankyou for making bits or sending materials that they couldn't get hold of. I got some small brushless motors that way. A 2012? Would that power a smaller boat with a couple of LiPos? I'll do some pics of those too. Don't forget to add the postage of my stuff to the bill. Cheers, Martin
Hi Martin, would have thought the name was self explanatory! 😉 In the attached pic you can see my Robbe Servo Tester at the top. I used it to simulate the proportional signal from a receiver while testing your Taycol converter boards, not to power the motor.😲 Motor power came from the mains PSU in pic two, the battery eliminator circuit (BEC) in the ESC provided power to the tester. The tester provides the signal to drive servos, or in this case an ESC, and saves the faff of setting up TX and RX and fiddling with batteries when I want to test a circuit or function before building it into a boat. Cheers, Doug 😎 Oh, and by the way; when you get into lighting for your boats don't forget to buy an LED Tester as well 😁😁 You could also think about a simple RF Detector / Meter to check if your TX is actually transmitting 😁 Like I did with your TX using a home brew device - OR you could wait til I get around to publishing a Build Blog for the refined version I am making using a couple of RF diodes and a sensitive 300microamp meter 😊
I was looking at that one! But as for the programming card...Gawd knows. I wouldn't know where to begin! Right now I'm bloody panicking as I can't find the Supermarine motor for the Crash Tender! I thought it was in the old motor drawer, but it ain't. I'm crossing fingers it's in a box in the loft. My son-in-law will have to go up there when the weather cools. Even he doesn't deserve the temperatures up there! Got my watt meter today, so that's now in a box with the condition meter and multi-meter, oh and the chenglish Charger and its power pack. BL motor and CNC 32mm prop still on the slow boat. So the ESC will be the last of the clobber for a while. By the time I have it all together it'll be Winter and all put away again! Thanks again, Doug. Cheers, Martin
Help required please, I have two Graupner Jumbo 540 6volt motors in an eboat circa 1978, I had fitted an Mtroniks speed controller replacing the Bob's board only to find that when the voltage dropped below 6 volts down to 5.6 volts I was experiencing intermittent operation of the esc. I have been informed by Mtroniks that the minimum voltage for operation of the esc is 6volts. Graupner have also confirmed that the maximum voltage for the Jumbo 540 motors is 6 volts. Do I have any alternatives other than refitting the Bob's board?
Thanks Westquay. I like your comments about air boats not being used much anyway. This is very true. Even if the boat was powered by an electric motor there would always be some miserable sod who would complain about the rotating airscrew. Boaty😁😎👍
I recently acquired an air screw driven hydroplane fitted with an A.M 15 diesel engine. The boat appeared to have either been from the Mercury Kit which was produced from the early 1960s till late 1970s or may have been built from the plans. What was unusual is that it had been fitted with R.C for rudder only operation and when I put a receiver in to try it, the system worked well. I also ran the engine and it appears to have been as new and after examination of the boat this appeared to have not been used either. In the 1960s I had built a couple of airscrew boats and they were free running powered by engines taken from my control line model aircraft after they had been pranged. Intentions are to eventually get the hydroplane on the water with brushless electric power due to the "No I.C" rules on my local boating lakes, something I never had to worry about as a 15 year old . Boaty😎
Speranza is a lovely boat and handles nicely but don't undepower it. Vic's Pond Skater is a good flyer and can be converted to leccy and rc. I put a half circle of piano wire across the tips of the front float as a buffer in case of striking an obstacle. My motive power Was 1.5 diesel a prop cut down from a heavy nylon 9" one so just clears the hull/frame . Free running was loads of fun. Air rudder not water. If it is sluggish and won't plane increase the downthrust. The opposite of what you might expect. Regards John Pond Skater can be found on Web Google Vic Smeed Model boat plans. BTW an original thread can be found on here with the title Scudder👍
Spitfires in this case are kneeler o/b powered vintage race boats. I thought I had 2 on the go, one for me and one for someone else, but I just found one! Oh well, one's enough. The dollies are needed to look like they're driving these things. They accept 1/6th scale dollies and I even have a suit of clothes bought off ebay for him! I bought an outboard motor from Hobbyking without fitted motor for bugger all, but now see that the same thing is £45 quid without brushless, which needs to be a 28mm watercooled inrunner. I'm going to need one of the those to fit the shaft and all that, but can only find one for 31 quid. It seems HK have been upping their prices lately! Do you have any reccomendations for where to get such an animal a little cheaper? I need the motor, I now realise, to build the dummy Godiva casing round it. It's supposed to be around 2300Kv, but the only ones HK have are more. Is that very important? Martin
Doug, I think compared with how it was relatively recently, there are, for argument's sakes almost no real scratchbuilders any more. I mean take, or preferably make a drawing and, using stock materials, make a model of something for which there are no kits. And there, the grain of truth is already branching out into a full tree. And that ain't gonna get any better when your own grandchildren, who have grown up watching you make stuff still can't conceive of working at a bench to make something they want, because they can't use their 'phone. I feel sorry for them on one hand and on the other I don't give a shit because I won't be around to see their despair when the power runs out and they wish they'd listened. My two twin granddaughters believe that a portable charger will always be able to charge their 'phones, wherever they are. Common sense has not even taught them to question where IT gets its power. OK, their education so far has been woeful and finally is improving now they've changed schools, but really, should that be necessary in the modern age? But that's a different topic altogether. On a better note, I have finally heard from someone local who wants to meet up for a coffee and a natter to discuss running model boats on the local river, a calm and canalised thing with almost no flow and a bridge to get both sides. Martin
No power, no parks, no public, no weight. If however I had any of those, I WOULD insure. I once saw a pylon racer scream out of the sky and go THROUGH a lovely clinker built dinghy. THROUGH, mind you and into the mud tother side. Clean as a whistle., A few months later, a very happy dinghy owner was showing off his fully repaired and revarnished/painted small craft, thanking the unfortunate flyer for his wayward kite as he'd got a full rebuild off the insurance. That, not THAT long ago, was the 5 quid a year MAP insurance. No questions, no faffing, paid up a treat. Now if I were flying those projectiles, or anything that fast and that heavy in public I would insure. Now see what a clever circling back to boats I've done there Cheers, Martin
Well.. sea trial's have taken place, a little to heavy so a smaller lighter battery to try next time, wrong propeller's to powerfull but they was one's i allready had so ordering new ones, and a minor pin hole leak.. otherwise, works well, pushed my big 4ft boat about ok... and forgot to take my *@#& phone so no photo's ....
Agreed John, but generally the USN used the term PTB, Patrol Torpedo Boat, and most other (allied?) navies used the term MTB Motor Torpedo Boat. RN of course also had pure MLs and MGBs, Motor Gun Boats - some of which I believe also carried torpedoes, just to confuse the issue further?, but I never ran across an MPT up to now.😲 Nowadays it's just FAC or FPB for the little bruvvers without missiles! Cheers, Doug 😎 PS Yep, I know the Wiki page you linked. That's the Power Boats demonstrator sent to the US from which the ELCO PTB boats were derived.
From my experience I would suggest 2-3x your motor current rating especially cheap ones from china, I have found that a brushless motor can rapidly draw high currents with fouling of the propeller by weed etc. I would check the current drawn with the propeller you intend to use with a watt meter in the test tank (bath) held stationary increase power and monitor the current drawn this must be well within the limits of your ESC this should show a 10-15% higher power consumption than when moving. The best bit of advice (which I often don't follow myself) is to put a fuse in line Please note some ESCs are not waterproof (avoid) or seal them with silicon sealant, go for a quality manufacturer and the highest current rating your can afford. Cheap 30A ESCs can be ok for low power motors under 10Amps my racing boat pull 60 Amps and is fused at 80Amps and has a 200Amp ESC