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  • Water Jet Drives & 3D Printing
    shaft Be able to print the unit in one piece on my 3D printer With these points in mind I had to alter quite a few key aspects about the original design the biggest of which was that it was just to big to fit into the build envelope of my Lulzbot Mini which has a build volume of 150 x 152 x 158mm the original Graupner unit is a relatively long and tall unit so I lowered everything included a base plate to tie everything together and knocked around 40mm off the overall length Some limitations are placed upon me when designing things to be 3D printed namely that they are 3D printed and certain shapes are very problematic to print this is what lead to the motor mount being a bolt on item but it turned out not to be a problem as the entire structure is remarkably rigid During a break at work I machined up a solid shaft coupling from some scrap Brass stock this sits nicely between the motor and impeller shaft which is effectively half the length of the old one at 120mm the dual bearings in the motor support the drive end nicely with the other end of the impeller shaft being supported by a Bronzelite top hat bush in the stator housing Cooling has always been somewhat of an issue on this project the passive cooling system worked well by just didn t provide the throughput necessary to keep the motor cool my active pumped system was a bit of a flop altogether and best forgotten about but I am very pleased with the latest system tapping into the positive pressure inside the stator housing the harder the jet drive works the higher the pressure and the more cooling is provided which is evident in the video as cooling water expelled increases proportionately with speed Testing on the lake today Test run one to try and keep the balance of the boat I had decided to use a 2250mah 3S Lipo which should give ample power for a test run but be much lighter than the 5000mah 3S batteries I normally use Firstly some harbor maneuvers were carried out to test the steering reversing and also to check the cooling system was working with everything appearing to be in order I sailed out of the harbor and started to apply throttle when the Lipo alarm went off So in the boat came and no sooner had I lifted the boat out of the water than the alarm stopped I suspect that there is something very wrong with this battery a fresh 5000mah was swapped in for test two Test run two proved to be very successful indeed although it was not without incident the boat suddenly stopped in the middle of the lake although it did restart again and later examination of the GoPro footage revealed the problem to be loss of pump prime due to rough water oh and the ESC

    Original URL path: http://www.modelboatmayhem.co.uk/forum/index.php/topic,53340.msg565966/topicseen.html (2016-04-25)
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  • Model tug boat for sale. 4 of 4
    boat for sale 4 of 4 Reply 3 on November 29 2015 01 18 52 AM thank you gents I have since found it by googling It is a Caldercraft kit by all accounts Jim Logged BFSMP Full Mayhemer Offline Posts 346 Model Boat Mayhem is Great Location Knott End on Sea Re Model tug boat for sale 4 of 4 Reply 4 on February 20 2016 11 25 54 PM This model is now open to reasonable offers and will be on show at the Heywood Bring and buy sale Manchester on Sunday March 20th Logged BFSMP Full Mayhemer Offline Posts 346 Model Boat Mayhem is Great Location Knott End on Sea Re Model tug boat for sale 4 of 4 Reply 5 on March 20 2016 05 18 38 PM This model apparently didn t sell at Heywood today and so the price has been reduced to 125 00 ono Jim Logged BFSMP Full Mayhemer Offline Posts 346 Model Boat Mayhem is Great Location Knott End on Sea Re Model tug boat for sale 4 of 4 Reply 6 on March 29 2016 10 40 15 AM AFTER A RETHINK THIS ITEM CAN BE POSTED as Neil has been asked by a gentleman if he would post one of them and seeing as Neil sent a model Riverman to California USA without breakage he has had a rethink And to ease the problem should anyone wish to buy one of these three models he would be willing to send it AS LONG AS the purchaser accepts liability for any breakages They will be packed up extremely well in TWO boxes one for hull and one for superstructure and as long as you organise a carrier to pick the items up from him at his home address which I can give you via pm you can use who ever you wish Myhermes will make a pickup from him to you if you wish And it will be weighed so you know what you are paying Should this ease the burden of anyone wishing to buy one Jim Logged BFSMP Full Mayhemer Offline Posts 346 Model Boat Mayhem is Great Location Knott End on Sea Re Model tug boat for sale 4 of 4 Reply 7 on April 19 2016 05 08 52 PM Last chance these need to be sold so price drop to 100 00p and if not sold will be sent to Blackpool show in October Postage extra but would prefer purchaser to organise their own courier as I don t trust parcel force JIM Logged andyram Full Mayhemer Offline Posts 66 Derby M B C Celebrating 40 years afloat 1976 2016 Location South Derbyshire Re Model tug boat for sale 4 of 4 Reply 8 on April 21 2016 03 49 55 AM Can you clarify which boats remain for sale please Regards Andy Logged BFSMP Full Mayhemer Offline Posts 346 Model Boat Mayhem is Great Location Knott End on Sea Re Model tug boat for

    Original URL path: http://www.modelboatmayhem.co.uk/forum/index.php/topic,53203.msg565962/topicseen.html (2016-04-25)
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  • hitec crystals
    Location West Linton Scotland Re hitec crystals Reply 1 on Yesterday at 08 31 35 PM saw this on facebook and have replied to your post there I ve a set at 27 025 private message me your address and I ll pop them in the post to you Ian Logged wicker Full Mayhemer Offline Posts 402 Location wick caithness Re hitec crystals Reply 2 on Yesterday at 08 34 42 PM passed on FB Logged Crossie Full Mayhemer Offline Posts 164 Model Boat Mayhem is Great Location Norfolk UK Re hitec crystals Reply 3 on Yesterday at 08 35 17 PM You could try a search in www anticsonline I found some 40mghz ones that way it s a sort of network of model shops I think Trevor Logged wicker Full Mayhemer Offline Posts 402 Location wick caithness Re hitec crystals Reply 4 on Yesterday at 08 59 58 PM Thank You Logged wicker Full Mayhemer Offline Posts 402 Location wick caithness Re hitec crystals Reply 5 on Today at 02 25 17 PM Tried that one tREVOR AND NO JOY Logged essex2visuvesi Full Mayhemer Offline Posts 6 148 Location Finland England Finland Re hitec crystals Reply 6 on

    Original URL path: http://www.modelboatmayhem.co.uk/forum/index.php/topic,54657.msg565959/topicseen.html (2016-04-25)
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  • I can remember the day when....
    Smooth seas never made skilful sailors Up Spirits Stand fast the Holy Ghost http www cleethorpesmba co uk mrlownotes Full Mayhemer Offline Posts 111 Location Nr Peterborough Cambs UK Re I can remember the day when Reply 26 on April 23 2016 04 40 58 PM I remember I ll risk it for a Swisskit Logged Bintur Ellenbach Nemo Full Mayhemer Offline Posts 1 012 Location Sussex Re I can remember the day when Reply 27 on April 23 2016 07 16 39 PM Quote from Netleyned on April 23 2016 04 33 13 PM I remember when war broke out I was in the garden planting carrots for the Nightfighters Ethel came to me and said Harold War has broken out Never mind I said let s put kettle on and have a nice cup of tea Ned I remember the war also Ned it was in all the papers at the time Logged RAAArtyGunner Full Mayhemer Offline Posts 3 077 Location Brisbane Australia Re I can remember the day when Reply 28 on Yesterday at 06 47 14 AM My earliest recollection of the war was as a young kid watching the semis going along Parramatta Road Sydney carrying planes with their wings folded Much later buying food with ration coupons which you swopped with neighbours Logged Gunna build that other boat one day Fubar Shipmate Offline Posts 7 Location N Shropshire Re I can remember the day when Reply 29 on Yesterday at 04 41 20 PM I remember Black Jacks and Fruit Salads were 4 a penny old money and every 4th click of the chewing gum machine you got an extra one Fish and Chips cost 1 11 and you got Sixpence for returning an empty Corona pop bottle Hay bales were heavy and barns

    Original URL path: http://www.modelboatmayhem.co.uk/forum/index.php/topic,54504.msg565958/topicseen.html (2016-04-25)
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  • IRON DUKE 1914
    and have never experienced a similar problem Even a change of crystals made no difference Traced it down to interference caused by the funnel smoke generator I m using step up voltage regulator for 12v to 24v It has a completely separate power supply Does anybody have any ideas Geoff could be a combination of many things I imagine most of these you have already considered Check out Proximity of voltage step up device to receiver aerial try to get them as far apart as possible Lead lengths shortest possible cable lengths both dc power and servo routed as far away from each other as possible shortest length probably difficult to achieve in a large model Ferrite ring worth trying a ferrite ring on the 24v cable maybe others as well even servo leads Common ground worth trying connecting a common ground connection between all electrical kit in the boat Re evaluate need for 24v e cig coils can work 12v Logged Geoff Full Mayhemer Offline Posts 299 Re IRON DUKE 1914 Reply 276 on Today at 01 36 02 PM Okay now for some pictures The first two show ID in the home made test tank and yes that

    Original URL path: http://www.modelboatmayhem.co.uk/forum/index.php/topic,43803.msg565957/topicseen.html (2016-04-25)
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  • HMS Dreadnought. Using Dental Drills as model ship turbines
    Jetcat marine turbine looks as if it is based on the air turbo prop with extra gearing although it does seem to be designed for speed not for scale More suitable for an unlimited hydroplane rather than a battleship Jim Logged Dundee Model Boat club http www modelboating co uk Mad Mike Full Mayhemer Offline Posts 2 596 Lincolnshire Location Lincolnshire Re HMS Dreadnought Using Dental Drills as model ship turbines Reply 26 on Today at 01 02 20 PM Looking on eBay I found these According to the item description They work at 0 3 MPA which is about 45 psi Autoclaved by steam and capabale of withstanding 135 oc 18 to 25k rpm Which is about 540 motor speed 5 1 gear reduction on it Can t see why not Logged Mad Mike Full Mayhemer Offline Posts 2 596 Lincolnshire Location Lincolnshire Re HMS Dreadnought Using Dental Drills as model ship turbines Reply 27 on Today at 01 05 18 PM http vi raptor ebaydesc com ws eBayISAPI dll ViewItemDescV4 item 221147777393 category 31458 pm 1 ds 0 t 1461585125290 Logged dreadnought72 Full Mayhemer Offline Posts 1 521 Wood butcher with ten thumbs Location Airdrie Scotland Re HMS Dreadnought Using Dental Drills as model ship turbines Reply 28 on Today at 02 12 25 PM Just to add to the mix Dreadnought the real one on full power trials 9th October 1906 SHP 24712 18 4 MW Speed 21 05 knots Coal Consumption 16 66 T hr 139 MW 30 MJ kg Steam Consumption 15 3 lbs shp hr The coal burning Dreadnought was therefore about 13 efficient in terms of turning the energy available in coal into motion The model will be less efficient again smaller props different Reynolds Numbers smaller diameter turbines the list is long

    Original URL path: http://www.modelboatmayhem.co.uk/forum/index.php/topic,54519.msg565956/topicseen.html (2016-04-25)
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  • Model tug boat for sale. 1 of 4 .....SOLD
    ever you wish Myhermes will make a pickup from him to you if you wish And it will be weighed so you know what you are paying Should this ease the burden of anyone wishing to buy one Jim Logged BFSMP Full Mayhemer Offline Posts 346 Model Boat Mayhem is Great Location Knott End on Sea Re Model tug boat for sale 1 of 4 Reply 7 on April 19 2016 05 08 09 PM Last chance these need to be sold so price drop to 100 00p and if not sold will be sent to Blackpool show in October Postage extra but would prefer purchaser to organise their own courier as I don t trust parcel force JIM Logged PhilandIom Full Mayhemer Offline Posts 26 Model Boat Mayhem is Great Location South east Cornwall Re Model tug boat for sale 1 of 4 Reply 8 on April 21 2016 09 36 45 PM Hello Jim I am tempted can you tell me if this boat could be ready for the water without too much work thanks Phil Logged BFSMP Full Mayhemer Offline Posts 346 Model Boat Mayhem is Great Location Knott End on Sea Re Model tug boat for sale 1 of 4 Reply 9 on April 21 2016 10 51 31 PM Hello Phil I haven t tested the model as I have no radio gear myself nor any knowledge of them but it is almost all there and it does work so mike says It is fitted with a propulsion battery esc and motor with 27 mhz receiver and I have been given by Mike two older 27 MHz transmitters and receivers and some crystals but no receiver battery packs I doubt it would need much fettling to get it to work or you could simply exchange the 27mhz system for a 2 4ghz system Jim Logged PhilandIom Full Mayhemer Offline Posts 26 Model Boat Mayhem is Great Location South east Cornwall Re Model tug boat for sale 1 of 4 Reply 10 on April 22 2016 07 52 24 AM Hi Jim sounds okay the radio side of things doesn t bother me as I have a working spare I will buy it and have sent you a PM thanks Phil Logged Captain fizz Full Mayhemer Offline Posts 219 Model Boat Mayhem is Great Location Oakham Rutland Re Model tug boat for sale 1 of 4 Reply 11 on April 22 2016 08 22 01 AM Good to see that these models are gradually finding new homes Logged BFSMP Full Mayhemer Offline Posts 346 Model Boat Mayhem is Great Location Knott End on Sea Re Model tug boat for sale 1 of 4 Reply 12 on April 22 2016 08 51 48 AM Quote from PhilandIom on April 22 2016 07 52 24 AM Hi Jim sounds okay the radio side of things doesn t bother me as I have a working spare I will buy it and have sent you a PM thanks Phil thanks

    Original URL path: http://www.modelboatmayhem.co.uk/forum/index.php/topic,53200.msg565955/topicseen.html (2016-04-25)
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  • Model tug boat for sale. 1 of 4 .....SOLD
    ever you wish Myhermes will make a pickup from him to you if you wish And it will be weighed so you know what you are paying Should this ease the burden of anyone wishing to buy one Jim Logged BFSMP Full Mayhemer Offline Posts 346 Model Boat Mayhem is Great Location Knott End on Sea Re Model tug boat for sale 1 of 4 Reply 7 on April 19 2016 05 08 09 PM Last chance these need to be sold so price drop to 100 00p and if not sold will be sent to Blackpool show in October Postage extra but would prefer purchaser to organise their own courier as I don t trust parcel force JIM Logged PhilandIom Full Mayhemer Offline Posts 26 Model Boat Mayhem is Great Location South east Cornwall Re Model tug boat for sale 1 of 4 Reply 8 on April 21 2016 09 36 45 PM Hello Jim I am tempted can you tell me if this boat could be ready for the water without too much work thanks Phil Logged BFSMP Full Mayhemer Offline Posts 346 Model Boat Mayhem is Great Location Knott End on Sea Re Model tug boat for sale 1 of 4 Reply 9 on April 21 2016 10 51 31 PM Hello Phil I haven t tested the model as I have no radio gear myself nor any knowledge of them but it is almost all there and it does work so mike says It is fitted with a propulsion battery esc and motor with 27 mhz receiver and I have been given by Mike two older 27 MHz transmitters and receivers and some crystals but no receiver battery packs I doubt it would need much fettling to get it to work or you could simply exchange the 27mhz system for a 2 4ghz system Jim Logged PhilandIom Full Mayhemer Offline Posts 26 Model Boat Mayhem is Great Location South east Cornwall Re Model tug boat for sale 1 of 4 Reply 10 on April 22 2016 07 52 24 AM Hi Jim sounds okay the radio side of things doesn t bother me as I have a working spare I will buy it and have sent you a PM thanks Phil Logged Captain fizz Full Mayhemer Offline Posts 219 Model Boat Mayhem is Great Location Oakham Rutland Re Model tug boat for sale 1 of 4 Reply 11 on April 22 2016 08 22 01 AM Good to see that these models are gradually finding new homes Logged BFSMP Full Mayhemer Offline Posts 346 Model Boat Mayhem is Great Location Knott End on Sea Re Model tug boat for sale 1 of 4 Reply 12 on April 22 2016 08 51 48 AM Quote from PhilandIom on April 22 2016 07 52 24 AM Hi Jim sounds okay the radio side of things doesn t bother me as I have a working spare I will buy it and have sent you a PM thanks Phil thanks

    Original URL path: http://www.modelboatmayhem.co.uk/forum/index.php/topic,53200.msg565954/topicseen.html (2016-04-25)
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