Thanks, Doug. Not sure what you mean by linear device. Sorry to be late answering, but at 7-30 this evening our power went off and it's just come back on! Boy was I after a cuppa! Sat and listened to battery powered DAB radio eating peanuts in the dark and drinking pineapple juice! Martin
[Score: 5/10] 20"/600g Elke HF 408 Capable of 2mph Single Propellor (3 Blade) Direct Drive to a 6v (3 Blade) Powered by NiMH (7.2v) Batteries - Comments: This is a restoration project - my first radio control boat 'Elke', is a small fishing boat with plastic hull, a Graupner kit, purchased in Germany when I was serving in the Army there in 1974. I am restoring it for my grandson. It used to be a good runner with a 6v battery, small electric motor, two servos, one wired so it could move boat in reverse as well as forward. A good little sailor, light in weight and a good pond model. Had to be careful of wave height. Anyway, it has been in the garage for 40 years now so much to do. The inside is a bit of a mess and everything has a layer of dust. I will fit a speed controller and NiMH battery. But nothing too difficult so hope to have it finished for Christmas.
If you are using 2 ESCs/BEC/UBECs with 2 plugged into 1 receiver you should remove the red wire from one of the plugs and tape it back to the lead, as both plugged in will possibly supply too much voltage for the receiver (you are getting double the voltage from 2 different sources) and this can cause the ESC to stutter . You should have no problems with Brushless out-runner motors as with the correct match with the ESC they should be as smooth as brushed. I have dual 2000kv 28/45 in-runners (with water jackets) and twin ESCs and 2 sound units using 1 receiver in my 64ft ASR model with no problems regarding proportional control (fwd or rev). I had a 28mm O/R in a Maiami ASR and it would crawl along (but the high noise was ear wrecking so have changed it back to brushed for now. I do have a similar slight high pitched squeal at certain speeds on one motor and this may be caused by the particular motor not 'syncing'properly with the ESC (Chinese cheap ESCs and HobbyKing /made in china motors) but short of changing that motor and ESC I am just putting up with it for now. The high pitched sync noise is fairly common and sometimes not fixable, (a number of my larger planes do it and its audible from 100m away (also amplified by a hull,-nice sound box). It can depend on the way a particular motor is wound (no 2 are identical) or even magnet placement/timing, as the may be hand wound by 2 very nice Chinese ladies at different ends of a bench ( just read some of the Hobby King motor reviews ) You could try changing the frequency on the ESC if it has that option as a higher motor Kv sometimes requires a higher frequency. Also make sure your ESC is set to the correct battery cell count. If it has an auto setting that should usually work best for general applications unless you are running fancy motors. Regarding interference, make sure you keep your aerial as far as poss from the motors and ESCs (even on 2.4 - I put mine right up in the bow) and there should be no problems. I have had 2 twin engined boats (my MTB & ASR) 1 brushed and 1 brushless running side by side 10" apart using the same radio for both (same type of Rec in each boat) with no problems at all. The bow down is probably prop shaft angle (the shallower the better) but if you are using counter rotating props you could try swapping props (inward rotation to outward) and motor rotation to see if it makes a difference. Also with 2800Kv motors you should be using small props (around 28-30mm diam 3 blade) as these motors are made to rev) as on a 2s battery they will be turning at around 20,000 dry and perhaps 18,000 wet (depending on prop) and if you load them too much they will cook with no cooling (assuming they are around 28mm dia ?) Only other thought - silicone couplings will squeal real loud if they slip.
[Score: 9/10] 29"/1200g Avanti Capable of 15mph and a runtime of 5mins Single Propellor (2 Blade X Type 35mm) Direct Drive to a OBL29/19-15M (2 Blade X Type) Powered by LiPoly (11.1v) 15Amp/h Batteries Controlled Through BLC-40M (25Amps) ESC - Comments: ARTR fast electric by Thunder Tiger. Deep vee powered by Ripper Brushless outrunner. Will reach 30mph+ when flat out. I replaced the radio that came with the boat with stick operated Futaba T2HR as I preferred "stick" to wheel for sailing fast boats. Initial problem was slight leak where stern tube passes through the transom but soon fixed it with epoxy. Electrics are in a box at the stern which is appears to be water resistant. Though not for a raw beginner, it is great for a second boat especially if someone is hoping to move on to a 6S . If not , it makes a good all rounder and is ideal for club fast electric racing and it performs well when doing tight turns. Boaty
This is a restoration of a launch I was given that was found in a rubbish bin on a farm here in Auckland It is an old RCM ? plan built 'Fairacre' and was pretty rotten when I received it as it is made in balsa and had been wet for quite a while. I stripped it down, re 'planked' large portions of the hull and fiber glassed it, re- built the cabin, re- marked the deck planks, fitted lights, curtains (ex Graupner Commodore bits from the 70s I had kept), stern ladder, cleats etc. It is fitted with a 540 brushed motor (originally had an old Graupner monoperm) and 70s Graupner ESC and Using 2.4 Radio gear. I still have a few things I'd like to do such as a re-wire, fitting chine spray rails, better motor and maybe some safety rails, but for now it does the job.
When I was in high school back in 1957 I built a kit of the Comet Gypsy Sloop Jr. In 2016 I found the drawings on-line for the Gypsy Jr. The boat was entered in woodworking class at our county fair where it received a blue ribbon. It has a working wheel that turns the rudder. Now I have under construction a 32 inch version that I would like to radio control. I'm not too sure how to set up or what type of servo to install.
I have by luck, not judgement acquired a second hand 'Nirvana' Yacht, it is a sloop rigged craft that was only sold in America and retailed between $250 and $350 according to the revision version and the year brought. This was a bit of a surprise to me as I only paid £10 for it. The Nirvana RC Sailboat was first produced by Megatech in 2002. and is 32in long and the hull& deck are ABS plastic. The quality of the boat is unmatched in the price range, with such features as a lead keel ballast, superior polyester sails that won't mildew, stretch or tear, and fittings that make the boat a dream to sail. The mast and booms are made of carbon reinforced composite that is light and very strong. The Boat hull is in sound condition just a few scratches, there is a hairline crack in the mast area, no radio gear at all. and sails are usable but really need replacing.
Appreciate your help, apparently only the large capacitor and 1 of the relays is suspect. The radio magicians from camp it would be possible to replace them but it would lose its value as an exhibition piece. Cheers Colin.
As I was saying.etc If original head is inside it might clean up. If on the bare cylinder you may have to rebuild the jacket.The engine looks like a Sparey Maybe from a kit.👍 Re being pre 1948 I am and remember my uncle having this little radio you could carry round . There were valved porties before that but care had to be taken not to bump it in case you collapsed a valve and they were quite heavy . I think the early trannies had two 6v lantern batteries so were fairly heavy but nothing like the valve jobs. Making the old type Tx means finding the old valves which might be hard.👍
Hi Colin, As discussed on the phone; 2V grid bias, 90V anode supply! In those days they had 90V dry batteries, they musta run it 'sumow'! 😁 Don't give up so easy! Nowadays how about a 24S LiPo? Or even Martin's 'big box' solution. http://www.batterysupports.com/lion-lipo-nbsp-88v-nbsp-24s-c... 24V chargers / balancers won't be cheap though🤔 2V is no sweat; 2V SLA, a la Glow Plug starter. How big is the boat an' how much weight can she carry? My first car radio was an ancient Echo valve job, with an inductive inverter bolted under the dash to produce the 90-100v for the bottles. Took me ages to find a way to mount it so it didn't make the whole dash hum like a swarm of bees😲 Later there was briefly a generation of 'low voltage' valves. Soon superseded by transistors from 1948 on. (And NO I'm not pre '48 vintage, well not quite!😉) Looking forward to your progress reports. Would really love to witness one of your displays. Please keep me posted about dates. All the best to you both, Cheers, Doug 😎 PS building a transmitter to match won't be easy. A TX on the right frequency is relatively easy, the tricky bit is the 'modulation' for the control functions! Hats off to your guy 'up the road' if he manages it! I'd really really love to see THAT!
Well today the radio specialist guys checked out the reciever for me, apparently it would need a new capacitor, a 90 volt and a 2 volt supply. Not really possible in such a small boat. So I've decided to use it for my vintage displays. The boat itself will be renovated and fitted with an electric motor, possibly a 600 as I have a couple in the spares box. Still looking for a way to remove the kitchen nozzle system. The motors that operate it are working so hopefully should be controllable by modern rc gear. Might need Dougs help designing a system I can build. BTW the Hull and cabins and deck is constructed from 1/4 Inc ply. Bit heavy but good and solid except for some of the frames are very soft and crumbly. Will start a resurrection blog soon. Cheers Colin.