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>> Home > Tags > prop

prop
prop
propshafts by RNinMunich Fleet Admiral!   Posted: 5 hours ago
Hi Roy, to dispel any possible confusion; by 'double jointed' I mean the true Cardan link. Which is in 3 parts connected by 2 UJs. Invented by an Italian mathematician and engineer several centuries ago to transfer rotation from one axial shaft line / level to a different (within reason) line without using gears. They inevitably create more friction by applying more side pressure to both input and output shafts, thus more wear on the motor output bearing and the tube input bearing 🤔 Plus friction and rattling/grinding generated in two 'out of line' UJs. If, as they should be, your motor and prop shaft are in (near) perfect alignment you don't need a Cardan! My maxim is 'less flexibility - more alignment' 😉 I like the coupling in the pic; called Stegkupplung in German, don't know the English for that😉 They are flexible but not floppy and totally silent👍 I once made the mistake (laziness🤔) of using a Graupner Cardan to couple up a geared Decaperm to the shaft in my Sea Scout. Never ever again 😡 After the first trials I took it apart and modded the motor mount properly. The original motor (perfectly fitted by my Dad) was a Taycol Target - the one I have recently modded for controllable forward and reverse. That will now be used in an ancient Billing Fish cutter inherited from an Aunt. Cheers Doug 😎

Decks by RNinMunich Fleet Admiral!   Posted: 6 hours ago
Hi Norm, Norm (!) Oughs drawing may well be 'as built'. During the war she received many mods. Depends on the time snapshot you want to recreate. I may be wrong about the island (photo perspective) but it seemed that way. I remember standing on the topmost island deck of a Colossus class carrier, at the foot of the antenna mast, looking down at ants crawling about on the deck, and the even smaller ones on the dockside! 😉 I was up there inspecting the COMMS antenna fit. That was my job the last 30 odd years. On existing ships I would survey the COMMS systems for upgrades and refits. For new build ships I would discuss the requirements and possibilities with the navies and then discuss with the shipyards how to achieve them! All good stuff, but the last 10 years I was getting a bit stiff for the climbing, so I sent a younger colleague up while I discussed the existing system and any problems with the crew in the Wardroom😉 Can't see your pic, the site only accepts jpgs etc🤔 An irritation that has often cost me time to do conversions 😡 We'll have to 'gang up' on Fireboat (Stephen) to get this improved. i often wanted to upload a pdf page, but had to convert to jpg etc first😭 Where is this mysterious platform? Maybe I can find it. A large searchlight would not surprise me. Could also be an early radar antenna, need to research the types mentioned above. If the launch has a cabin it may be an 'Admirals Barge', and Admirals had a lot of freedom to paint them how they wanted. So black and mahogany sounds very appropriate to me 👍 Often said on this site (and elsewhere) but: 'The only silly question is the one you don't ask'! Keep up the good work, Doug 😎

propshafts by Trillium Commander   Posted: 7 hours ago
Doug, Regarding your comment, "Avoid using double jointed couplings, they waste power and create wear and noise". Can you please explain this in more detail? I have heard this comment before, but my experience has been quite the opposite. No noise, no wear (yet) and no noticeable loss of power, presumably evidenced by the couplings getting hot. Roy

Logos etc by RNinMunich Fleet Admiral!   Posted: 12 hours ago
Hi Both, I just bought some transfer paper for inkjets via Amazon. Actually came from a UK supplier, couldn't find any in Germany ?🤔 20 A4 sheets for € 15.68. Good instructions how to stop them smearing, keep your fingers off until they are really really dry and set, and how to transfer and seal them. Gloss or matt varnish, or there are also proprietary transfer 'Fixers'. haven't tried 'em yet cos the sea Scout hull ain't that far yet! Will report in the Sea Scout BR blog. Cheers Doug 😎

propshafts by fred12 Seaman   Posted: 1 day ago
Hi Doug 3.45 am to hot to sleep as you said I have the motors so will give it a go only half way through the build but will let you know when it takes off if you see a bright light in the sky it may be the boat regards fred

propshafts by RNinMunich Fleet Admiral!   Posted: 1 day ago
Hi Dave, Yep, agree, to a certain extent. I have also had surprising results with 385 / 400 sizes; for instance with my 110cm heavy and cramped submarine. On the surface it outruns most boy racers 😁 Not exactly scale but all good fun. A little down angle on the forward planes and it throws up a beautiful handlebar moustache of water 😊 Not too much angle at speed or it sticks it's tail in the air 😲 No, the main question was that Fred already has the 700s so I simply suggested a decent match, 5mm shaft and so on. If he wants to spend on more motors fine. the the 3mm shaft would surely save weight, mostly through the smaller tube. Don't know the rest of the detail of the boat; beam, draft, safe waterline etc, but I would have thought a 3 footer would have a reasonable carrying capacity, like my 3 and 4 foot warships. Most of those run on multiple Speed 600s. And there I have the usual warship high length to beam ratio and associated stability problems! Like I said; he pays his money and takes his choice. Personally I would give it a whirl with the 700s since they are in the box! Maybe though with a 3 or 4mm shaft and appropriate coupling so he can adapt later if he wants to. Would still think a pair of 35 props would do the trick. Whatever, have fun Fred. Look forward to the Sea trials Report! (Wrote, read and commented enough of 'em in my old job!) Cheers Doug 😎 Oh no! Yet another thunderstorm just started, my terrace is already swamped 🤔

propshafts by Dave M Fleet Admiral!   Posted: 1 day ago
Hi Doug I agree a 600 is probably too heavy. Looking on Cornwall Model Boats site the motors sold for the kit (currently unavailable) look more like 400 size. I have used JP Power 480 motors in small craft and they are very punchy, light 92g and will work very well on 7.2v with a shaft diam 2.3mm. I agree the Raboesch prop shafts are good but to keep the weight down I would be looking at 3 or 4mm. Prop Shop have three bladed racing props specifically for this motor. Dave

propshafts by RNinMunich Fleet Admiral!   Posted: 1 day ago
Hi, The 600s strike me as very high revving for direct drives in such a twin set up. The the alternative would be the #1793 600 Speed. Remember Fred it has only a 3.17mm output shaft. Weight difference is not dramatically less, 15g. (250-235) Power is only 2/3 (60W) so it will probably 'potter'. Current draw at max . eff. is 1A less (>10%). So I don't see that the 700 needs a significantly bigger / heavier battery - don't have to put the pedal to the metal ALL the time 😉Anyway; Fred already has the 700s, 6316s! 👍 Whatever you do Fred enjoy it not regret it. 😉 Cheers Doug 😎

pt 109 by basilsdad Petty Officer   Posted: 1 day ago
a 30"scratch built pt. boat, I built hull from .8mm ply using a resized eezebilt 20" plan. the deck fittings were copied as best as I could from photos and drawings found on line. powered by 2- 2200kv brushless out runner motors through 2 20 amp speed controllers. twin contra rotating props twin rudders fast and light a pleasure to build 2

propshafts by fred12 Seaman   Posted: 1 day ago
Thanks Dave taken onboard regards fred

propshafts by Dave M Fleet Admiral!   Posted: 1 day ago
Hi Fred For a 3' boat the 700 size motors and required batteries will make for a very heavy model. The table Doug has provided indicates a speed 600 size motor would be more suited and would certainly be about half the weight. I have two 700 motors in a 4' hull for a RN Exploit model which does require the weight and can carry the large capacity batteries. Each motor can and does draw about 15-18 amps. I do not know your model but if it is anything like the Rivas then weight and internal space will be at a premium.

Kingsmill mbc 10th anniversary open day by kmbcsecretary Chief Petty Officer   Posted: 1 day ago
This event has now been rescheduled for Saturday 2nd of September all are welcome to join us but please p.m me if require gazebo space. This event has been sponsored by the following traders who have donated goods and vouchers for prizes and raffle Nylet, Macs Mouldings, Hobbies, Permagrit, Deluxe Materials, Prop shop the hours are 9am till 5pm thank you

propshafts by RNinMunich Fleet Admiral!   Posted: 2 days ago
Here's the whole Graupner Speed spec. table so you can see the other parameters and headers. Cheers Doug 😎

propshafts by RNinMunich Fleet Admiral!   Posted: 2 days ago
Any time👍 If you're not making a racer out of her but a Gent's Runabout 2x35mm 3 blade will probably do the job nicely at 7.2V. The sintered bearings will probably also do the trick, keep 'em lubricated! Happy sailing 😎 Shaft alignment will be important, as always! Avoid using double jointed couplings, they waste power and create wear and noise 😡 Minimum flexibility and maximum alignment 👍

propshafts by fred12 Seaman   Posted: 2 days ago
Hi again Doug batt 7.2 and the motor 6316 i will take your advice and go with the Raboesch again thanks for taking the time to help a amature kind regards fred