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October 2018: 5 people September 2018: 13 people August 2018: 5 people July 2018: 8 people June 2018: 8 people May 2018: 7 people April 2018: 24 people March 2018: 13 people February 2018: 8 people January 2018: 9 people |
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Sub-Lieutenant
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New Zealand
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Have you tried soaking balsa in boiling water and pre forming it to shape ? (bend around pegs on a board) works well for hard wood as well. Shape, allow to dry, check and repeat as necessary. Be gentle with it and if the curve is tight, do it in stages.
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Thanks for the kind comments. Planking did take a couple of days but was not done all that neatly (just clamp and cyno) as I was glassing it later - it was all thin resin coated inside to seal it). Planking was just a hint at the original so you could just make out the planks through the glass. Have included a few more pics of the motors and interior which is not that flash but is unseen, (more for the fact that I had seen the original and was sort of putting down what I remembered from when I was 15) There is a small picture at the top left of the stairs which on the original, was a Photo from an HSL looking off the Stbd rear 1/4, to 2 64ft HSLs side by side climbing over its wake at speed The stair set is the original from the wheelhouse to wardroom, which has been kept and used again by the present owner (down to utility room in front of engine room) and still has the original 'POWER BOAT' rubber treads (not bad nick for 79yrs old!)
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The FSR6B will work with the FR Sky i6, i 10, T6 (which might be the HK-TR6A-V2), CT6B AND TH9X (which is the 'Hobby King' (FR Sky) 9x). I have bought the (Fly Sky) FSR6B and the FSR9B (8CH) and they both work fine on the 9x. Not sure what the difference between FR Sky and Fly Sky is, but it's probably just branding. I think Hobby King puts their own names on everything and modifies model numbers just to confuse everyone, like saying only their receivers match which is not true (perhaps in their product line but not in the real world) you just have to look around and take a punt. FR Sky make the TH9x (HK 9x) probably the 9XR for HK, the Taranis and a few others. Fly Sky seems to make the cheaper ones i6 (which I think has replaced the 6df) TR6a HK-6DF TGY 6X (hard to find the XR5000,- 7000 RXs anywhere for the 6x) etc. It might be worth a crack at the 6ch FS-R6B receiver as the matches mention a T6 TX, not much to loose and if it works, buy a bunch (check EBay, AliExpress and Banggood,-prices vary for the same items) like I did just in case HK dumps it and leaves everyone high and dry, as they have with a number of products. Now days you have to do lots of research and risk a few dollars to win, with all the B/S you get from suppliers,-not just R/C.
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Thanks for the positive comment, and yes, it''s a great pond, part of the Gulf Harbour development on the Whangaparaoa Peninsula in Auckland. It is home to the Gulf Harbour Radio Yacht Club, the members having built the jetty, and they race a number of times a week. I am about 15 km away in Red Beach but its worth the 15 minute drive on a day such as this one.
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Just put up another vid showing the speed at around 2/3 throttle which looks reasonably scale for 38 knots (bit hard to scale water movement as we all know!) and it doesn't squeal too much at this speed. Just been back through my old info on the ESCs and found I may be able to change a few things (forgot due to approaching dotage and so many projects on electric (18 planes as well converted from ic to electric) I was thinking with your high kv motors that if you can get away with smaller props or some the scale diam bit finer pitch props, that would allow the motors to rev how they should, but give you finer control. As I mentioned before, on 8v per motor they will spin at around 16-18000 rpm and won't like a big load (you've no doubt heard those delta wings scream) . My props are 28mm x 3 blade on a 2000kv motor and are spinning at around 12000 rpm (probably around 8000 rpm in the vid at 2/3 throttle) The general rule with brushless is the higher the kv the smaller the prop/pitch and vice versa planes or boats (would also apply to brushed) If you have an in line amp meter/batt checker you can check the amps drawn in the water at full power (have someone hold the boat) and see if you are under max A for the motor. You can then prop to suit if necessary. This is the only way to check for correct load and is an absolute must for aeroplanes. After a run, motors should be around cool to almost too hot to touch (60-70deg C) There are backplate water cooling units available for using out-runners in boats if necessary eg pic.
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British Power Boat 64 ft RNZAF HSL scratch built 36" R/C model with twin systems including sound. Brushless 2000kv w/cooled (pump) in-runners, 30A car ESCs, 2200mah 2s LiPos remote lights etc. Started off in 1940, new with the RNZAF and had many modifications over the years till decommissioned, including machinery reduced to twin 671 Greymarine GMs (from the original 3x 500hp Napier Sea Lions) which were finally removed around 7yrs ago and replaced with a single 650hp GM Detroit 8v92T1 (still does 20 knots in its latest configuration ! - see this on the photo gallery of this model) This boat is in far better condition than the ex Phil Clabburn restoration of HSL 102 (he didn't have much to start with) and the hull has never had any major rebuild apart from being glassed to the W/L. Even today there is no way most people would pick it for 80yrs old. Those hulls never age! (ie some of the beautiful 'Whale Back' conversions still around)
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I would check out the water cooled back plates for the out- runners as they will possibly run real hot if at all loaded up without cooling, unless you have fans like aircraft propellers (even then and in open air they still get hot!) I would look at this seriously to avoid cooking your motors. Hobby King usually has various cooling parts, or EBay, Aliexpress, Banggood etc. Bit late now I suppose, but water cooled in-runners (around 2000kv 28mm diam) are a better idea for boats. You can buy in-runners and water jackets to fit them as I did but they need flushing after use with CRC or similar to avoid rust, (I'll be copper tube wrapping the next lot, then there are no worries)
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Good to hear you are making progress with the noise. My ESCs are not programmable as far as I know (There may be a card somewhere). They were cheap Chinese waterproof car/Buggy ESCs with Fwd and Rev which I wanted for independent drives but for the price and how well they work, you can't beat them (about NZ $20 each) They have a very soft start (you can count the revs) programmed in as std, and the only problem I have found is that they sometimes won't go straight into reverse without quickly nudging forward and back, (just need to drive in a scale manner and it's fine.) I'll put a pic of the unit and motor in (also a brushed one I am using in the MTB (x2) which work perfectly only NZ $9.00) They have braking, FWD, FWD+REV and batt type adjustable by jumpers. Throttle set-up is simple with full FWD and partial Rev set by the sticks. Both types are 30A and never even get warm. I purchased some fans for them but have never used them. The brushless units have a fan plug on them. The squealing I have may just require a switching frequency change on the ESC (8kHz/16kHz -more RF noise on 16kHz but more efficient) but I don't think I have that option (do you have that option to try on your set-up ? might be worth a crack). The sound units muffle it a bit anyhow. Boat runs at 10mph (GPS) flat out (looks way off scale) but only needs about 1/4 - 3/4 throttle for normal cruising. Will try to put up an external vid soon. Transmitter is easily modded to twin throttles,- excellent cheap set for boats ( later model has internal aerial)
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Have just posted a video of my 64ft HSL model. I have the same problem, and you will hear if you watch the video, that when it's given some gas, it gets a slight continuous squeal on one motor. Some of it is from the silicone tube couplers I use, slipping on heavy acceleration, but the continuous noise is the motor. I'm guessing this is what you have, and like you I just put up with it, or drive slower.
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Nice work, looks very sturdy and effective.
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Boat is Scratch built 36" British Power Boat 64ft High Speed ASR Launch which belonged to the RNZAF. The launch was one of the 22 built and was shipped to NZ in 1940. It was the only one of its type in the Southern Hemisphere. Model has twin motors, ESCs, sound units etc. Has remotely switched water pump for water cooled brushless 2000kv in runner motors and remotely switched lighting. Uses 2x 2200mah 2s LiPos for drive and 1 1800mah LiPo for the pump (also a separate battery for the LED lights. Boat is built with strip planked balsa on ply frame and fiber glassed. Deck is ply, wheelhouse is varnished balsa. The colour is as it was for most of its time in the RNZAF . Took about 5 years on and off to build and finished it last year. (please ignore the time date - can't get rid of it .
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I've used small brass shafts in brass bushed tubes with oilers in my MTB and they've lasted for 20yrs of average use, although they get a bit noisy when short of oil. Best would be brass shafts in brass tubes with Teflon/Nylon/ bronze etc bushes (a center bush as well if poss - have used these in ic power boats for years with hard steel shafts for the power). Brass is good as it's self lubricating to a degree and with a good quality oil can run quite smoothly and quietly, and is very simple, and when looked after won't corrode like steel or miniature ball or roller bearings (unless stainless).
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Starting a bit backwards here as have posted more recently with some ideas. If you are going to have a twin brushless system using 1 REC, you probably should have twin 2200Mah 2s lipos, a power lead (I use a JST plug set) taken from the input leads of ONE ESC (not the batt leads) (I break into them and solder the JST leads on ) run those to a UBEC and then to your REC switch then to your receiver. If your ESCs have a built in BEC, withdraw the red power wires from the BEC receiver plugs and tape them back as you now don't need the power from these. If your TX is 2 stick 4/6ch etc and is capable of being changed to 2 throttle sticks (provision for ratchet strip - copy if necessary - on opposite gimbal - ie using set up as mode 1&2 throttle) you can use the existing throttle and elevator stick to give full independent control with either rudder or aileron Ch for rudder. The Chinese ESCs I use have a power switch as well as BECs which is handy. I would keep the brushed system separate from the brushless altogether with its own battery (or try power from the other batt as described above) otherwise you may be trying to mix 3 phase and single phase at some point. If you are using 2.4 you could use another paired 3ch receiver (does work, as mentioned in my later post) to only run the brushless throttle from a rotary sw on your TX (if you have that )
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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.
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Fantastic detail, great job, looks the part.
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This is my scratch built 36" RNZAF British Power Boat 64' HSL (arrived in NZ 1940). I actually went on board this vessel in 1968 when it was still in original form (the RNZAF having disposed of it in the 50s) This vessel is still around and has been recently re modelled (2nd time since early 70s) and I was lucky last year to have met the present owner and go on board (2nd time in 49yrs!)and take a few photos. The vessel was modified a number of times by the RNZAF over the years (air intakes, removal of the fore deck machine guns, wheelhouse turret etc so I sort of went in the middle. I found a few drawings of the type in an old mag which had side and top views plus the bulkheads and their positions, so I took them along to a copying shop and kept enlarging them until I had the desired proportions. This worked out quite well and using a few methods from other models I had built, managed to frame (ply) the hull and then fully strip plank it in balsa. It was then fiber glassed. The deck is ply, lined and varnish stained. The wheelhouse is varnished balsa and is removable for access (wheelhouse roof is also removable along with engine cover and foredeck access hatch, - small foredeck hatches open as well.). The wheelhouse interior has detail such as controls, instrument panels, skipper, steps to wardroom etc but is not too detailed as it is not seen. The boat has full lighting by remote switch, lights are all LED. All cowls rotate. The propulsion side has dual everything (motors, ESCs, sound units), would have had 3x but ran out of space! Motors are 28mm 2200Kv water jacketed in-runners (cooled by remotely switched pump) using 30A Chinese ESCs (have 5A BEC, Fwd and Rev). Twin sound units are 'GT Power' car units which have around 40 different sound selections, from Cosworths to diesels and are computer programmable (as well as manually on the unit ) for various functions. I am using one of the v8 sounds (8 cyls short in my application) which I think is as near as you are going to get to 3 Napier Sea Lions (for which there is obviously no sound available) They 'start' 'Idle' and are fully proportional in fwd and rev and can sound quite realistic (will attempt to put up a vid later). Batteries are 2x 2200mah 2s 20c LiPos which will last around 2hrs at least of sailing (they also run the sound units) Still have a few small things left to do (have just made wheelhouse air intakes) but don't want to get too fiddly. Just want to keep it a practical model.
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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.
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