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>> Home > Tags > contra rotating

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contra rotating
46" Firefloat What Motor/Battery by moormedic Seaman   Posted: 27 days ago
Hiya Many thanks for taking the time to reply sir...very much appreciated. All useful stuff.....current battery weighs 2kg!! My props are three bladed 40mm dia contra rotating. Purchased with advice from "Prop-shop" Cheers 👍 J.J

Swordsman hull by Rex3644 Sub-Lieutenant   Posted: 2 months ago
[Score: 5/10] 34"/3400g Swordsman hull Twin Propellors (3 Blade 45mm) Direct Drive to a Johnson 600 x 2 (3 Blade) Powered by Lead Acid (12v) 7Amp/h Batteries Controlled Through Chinese (80Amps) ESC - Comments: This was my first serious attempt at model boating and the hull a Swordsman fibreglass 34.1/2" was purchases 50 years ago from Radio Control supplies Isleworth in 1967 along with a used RCS Sequential radio. Over the years it's been powered by an ED 2.46 Racer a Merco 35 and finally my treasured OS61 VRM With a tuned pipe from Prestwich model boats. Now it's time for a a total rebuild so i,be decided to try twin contra rotating screws and brushed 600 motors. I'm looking to fit a superstructure akin to a Sea King. So far the hull has been stripped of all its hardware and all holes made good with resin and glass fibre tape. Currently making jigs to set up the two new propshafts More to follow

BRAVE / PERKASA MTB by RHBaker Fleet Admiral!   Posted: 2 months ago
Am scurrying around looking for a future project and have decided to attempt the Vosper Brave class MT/GB. Will use a hull that is about 37" long from MTBHULLS, as that is the size that fits our usual sailing venues best. There are a number of members who have built either the Brave or the Perkasa derivative. Can anybody suggest the best electric drivetrain for this project? At this stage am thinking of triple screws, individually powered so getting a contra-rotating screw should be relatively easy. Would like to emulate the performance of the original if possible. Appreciate any advise on this project and recommendations for a successful model.

Billings Sea King refit by AllenA Fleet Admiral!   Posted: 2 months ago
The speed 600s should be great. I have the original Como 480s and it went well. Was much improved when I made sure the props were contra-rotating. I know, Rookie mistake but then I am still a Rookie.

pt 109 by basilsdad Sub-Lieutenant   Posted: 4 months 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

Counter Rotating Props by Trillium Captain   Posted: 8 months ago
Inwards or outwards - should the props be turning to meet together above the shaft or below it? Also from Wikipedia "Contra-rotating is where parts of a mechanism rotate in opposite directions about a common axis, usually to minimise the effect of torque. Contra-rotating propellers should not be confused with counter-rotating propellers, a term which describes non-coaxial propellers on separate shafts; one turning clockwise and the other counter-clockwise." Torpedoes are a marine example of contra-rotating props. Roy

Counter Rotating Props by pmdevlin Fleet Admiral!   Posted: 9 months ago
with my 4 foot fireboat, I use contra rotating props, from propshop. I was advised by them to have them turning outwards, as viewed from the rear, there was an explanation, I've forgotten it, however, on the water, at speed, turning was difficult, the boat just wanted to roll. I swopped them over, so turning inwards, and the handling was cured in an instance. Its easy enough to try one way, then the other, see what is best for you, but remember to use some sort of none permanent thread lock or you might lose one of your props

Counter Rotating Props by Dave M Fleet Admiral!   Posted: 9 months ago
Actually for ships with props on separate prop shafts it's counter rotating. Contra refers to aircraft equipped with contra-rotating propellers with rotation about the same axis in opposite directions. Contra-rotating propellers should not be confused with counter-rotating propellers on separate shafts turning in opposite directions. I was intrigued by this discussion, possibly because it reminded me of my model flying days. What would we do without Wiki! Dave

Counter Rotating Props by 4clubs Fleet Admiral!   Posted: 9 months ago
CONTRA AND COUNTER rotating Props . Actually both are correct. Probably counter rotating is more correct for ships. We could argue for days!! Anyway they both go in different directions. One clock wise when the other is anticlockwise, but make sure they have left and right hand props, not the same type or you will be in trouble.

Counter Rotating Props by 4clubs Fleet Admiral!   Posted: 9 months ago
They are CONTRA not COUNTER rotating and on LIFEBOATS they turn inwards on other vessels they generally turn outwards when the vessel is in the forward direction.

U35 clockwork submarine by mactin Lieutenant   Posted: 11 months ago
U35... Finally done! 2 Months this one took! 3 Ballast Tanks Clockwork Timer for the compressed air system clockwork motor for the coaxial contra rotating tandem props. Maximum time on the bottom 1 hour. clockwork tinplate submarines are great fun!

1/200 Yamato by Tinman0405 Apprentice   Posted: 11 months ago
Hi guys Im having a clear out of stuff ill never get around to and thought Id give club members a chance on this one. If not its off to ebay next week. Ive decided to let my Barn find 1/200 Nichimo Yamato go. Bought about a year ago and really all ive done is taken it apart. Its been stored in a shed before that for thirty years but i reckon its 95% there. £350. Collection only from Dorking in Surrey. Pictures here of before stripping down: http://www.crispyandtherocketman.com/blank http://www.crispyandtherocketman.com/blank?lightbox=dataItem... What you get: As you can see from the pictures when she came to me she had been stored in someone’s shed for the last thirty years. Virtually all there but infested with spiders and covered with an inch of grime. Scroll forward six months and all the parts that could be teased away have been and washed and in some cases primed. Hull stripped and primed. The original noisey contra rotating gearbox is included but prop connectors had perished. Suggest replace this gear box anyway. Damage to the bow. Ok I won’t lie I dropped a hammer on the damned thing. The ABS plastic foredeck shattered. Took the opportunity to replace the oversize tread plate with correct scale 1/200 tread plate. Damage repaired. Old deck retained so that the anchor fairings could be remade to replace on new deck. Other fittings all salvaged to be refitted on new deck. Rear hanger remade to include a full hanger. Rudder stem needs to be trimmed to allow for deeper hanger. Easy job. Aircraft. Three included all apart for rebuilding. Boats. All present I think. Main guns . Started work on crafting two line railings as wanted to use plastic for strength as this was going to be a pond runner. Easy job to finish. Brass etch doors added Rest of the bits. Are all contained in several pots for sifting through. I can honestly say there will be a few minor items missing but nothing major or that can be scratch built. Very few of the single AA machine guns made it to me, theres a few for templates or casting f you can do that. Superstructure. Complete as far as I can tell. The Big AA guns are all complete and present. Some barrels are dinged but all present. Those that can be removed for working on have been. Rest are stuck on solid. If your interested PM me and Ill take pictures of what she looks like now for you.

U35 clockwork submarine by mactin Lieutenant   Posted: 1 year ago
Hi MBW,s Tinplate clockwork torpedo/submarine propulsion is twin coaxial contra rotating props totally scratch built handmade. Its about half way through the build at the moment just doing the clockwork ballast timer and compressed air system. Cant wait to chuck it in the oggin.

Victory Industries Vosper Fire Boat RC conversion part 8 by smiggy Sub-Lieutenant   Posted: 2 years ago
This is the props bit from the instructions, "I bought a pair of contra-rotating brass props from the Prop Shop taking their advice on the best size for the boat (their ref 0871/3 M2). The prop shafts are Graupner jobs with 96mm tubes, 114mm shafts with M2 threads. At around the same time I bought half a dozen cheap 6V motors, the Intention being to use one per shaft." Forget the cheap motors, I'm running 2 x 280's at the moment and a 9V pack of AAA batteries spread out around the area where the original battery tray was. Not ideal. It's either more power, brushless, and lighter batteries or major weight loss, re-building the deck and above in lighter material. I still intend to rebuild the old one I dissected to see exactly was inside. I haven't the 'oomph' to this at the moment but it will happen, honest. In fact this discussion has got the juices stirred..... 👍

Veron Huntsman 28 by Haverlock Fleet Admiral!   Posted: 2 years ago
I can make a suggestion since you need a simple system Have a look at these systems http://www.cornwallmodelboats.co.uk/acatalog/Brushless_Motor... at only 28 inch the smaller of the 3 would be more than powerful enough. Remove the red receiver lead from one of the ESC so only one BEC is in use. and couple them together through a "y" lead. a 3cell LIPO would provide all the power you need chose a capacity to suit the available space. If your not used to LIPO batteries then PLEASE READ UP ON THEM FIRST they are not robust. You would also need a LIPO specific balanced charger. Even though the 2 ESC would be driven by the same control channel you can still have contra-rotating props you can reverse the direction of a brushless motor by just swapping over and 2 of the 3 motor leads.