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>> Home > Tags > jet unit

jet unit
power unit
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jet unit
My other hobby by figtree7nts Fleet Admiral!   Posted: 3 months ago
I've gotten a chance to fly a few times. And loved every time! But it's been on big jumbo jets! Never had the opportunity to fly on a small aircraft! Now that sounds like great fun...….

Transfers by RNinMunich Fleet Admiral!   Posted: 4 months ago
Hmmmm!! Waterproof? Have you ever tested that? I'm not so sure, having used them in the office virtually since their inception. Anyway, when they are mounted on the boat / ship they need sealing in with a coat of clear lacquer or they may sometime 'float' off again. Apart from that have not yet seen any transfer paper made for Laser printers. Transfer paper made for Ink jet printers may melt 😲 in laser printers in the final transfer / fixing unit. I can tell you, it makes an 'orrible sticky mess wot ain't easy to get rid of. Doug

Command Boat 90 by CB90 Fleet Admiral!   Posted: 11 months ago
Scratch built at 12th scale from pictures and profiles of the internet. The boat was originally built in Sweden a class of fast military assault craft originally developed for the Swedish Navy by Dockstavarvet Speed: 40 knots (74 km/h) Draught: 0.8 m (2 ft 7 in) Length: 15.9 m (52 ft) Overall; 14.9 (48') Complement: 3 (two officers and one engineer); Up to 21 amphibious troops with full equipment Armament: 3 × Browning M2HB machine guns; 1 × Mk 19 grenade launcher; 4 naval mines or 6 depth charges . The Model I was attracted to this boat due to its great performance and maneuverability, this was mainly due to the use of twin water jets as the main propulsion, this is a trade off with efficiency. So my start point was to collect as much information as possible about the boat this involved collecting pictures and profiles of the craft from various sources. Eventually I found some plans of sort :- My Dad was a boat builder in the days of wooden yachts, and had showed me how to make plans and frames from a line drawing. I went about this first by creating a prototype about 24 in long out of light ply. I then created full size plans of the model to be made. Pictures of small prototype finally painted plain green. The Main model Used my computer to print out the frames onto paper, cut them out and used them as templates for the ply ribs. The construction was simple chine style, with 1.5 mm ply. I tried to build jet drives but failed to produce a effective unit. So reverted to propshafts which worked out well with better control and the boat can spin on it own axis by putting one engine in reverse the other in forward and adjusting the twin rudders. That it for now, hope it was of some interest

Red Cat hydroplane by SimpleSailor Sub-Lieutenant   Posted: 1 year ago
Hi. It is a scale model of a sponsord jet turbine powered hydroplane. I think this livery was from 2009. They can be seen racing on Youtube .As for the burning out motors that is sorted. Nothing to do with my cooling system but the unit I had from Hobby King seems to have a number of complaints about them burning out. So replaced it with a different model. HK have been very good and replaced all 3 failures. I will keep the latest replacement for another boat.

Seabreacher by canabus Fleet Admiral!   Posted: 2 years ago
Hi Steve The Graupner Speed 900BB Torque specs are 6-40 volts, 6,500 rpm, 54A amps, shaft 6mm, dia. 51.5 mm, length 95mm and weight 645 grams. A brushless motor like the Hobbyking L5055 600kv is 11.1- 22.5 volts(3S -6S) power 1500watts, 55 Amps, shaft 6mm, dia. 50mm, length 55mm and weight 311 grams. On 3S=6660 rpm, 4S=8880 rpm and 6S=13500 rpm. The brushless motors are far more powerful and with an ESC with handles up to 6S(22.5 volts) you would have rpm's to drive a water jet unit. Canabus

Seabreacher by rolfman2000 Fleet Admiral!   Posted: 2 years ago
I think I would be tempted to go brushless with it. Far more power for the size of motor. I don't think an 800 brushed motor would have the revs to push much water through a 50mm jet unit. Even an 850 motor would be an improvement. But going brushless, you could get far more revs out of it. Best of luck with your endeavours, Dave W 😀

Jet Sprint Boat by Rod Commander   Posted: 2 years ago
Well finally finished the actual boat and now ready for fit out Zenoah 26 cc marine engine arrived this morning and jet unit on its way so busy days ahead Got to make roll bars to scale yet probably use aluminium to save weight The engine develops 3.4 hp at 13000 revs so should give it a bit of punch 1/4 scale crew to order yet and some instruments for dash board Think I will have a wee break from it all for a while and give my mancave/ Messcave a bit of a tidy up lol

RAF rttl D2763 by teejay Commander   Posted: 2 years ago
A brief history After the second world war and as part of the occupational forces the Second tactical air force the RAF took over Sylt airport in 1945 and later in 1946 the RAF decided to use the airport and the airspace west of Sylt and Amrum as a firing range, and was known as RAF Sylt Armament Practice Station. From February 1948 to February 1949 the airfield was closed and prepared for the operation of jet aircraft. For target practice a target towing Squadron was stationed continuously on the station. The aircraft used were Miles M. 25 Martinet, hawker Tempest TT, DE Havilland mosquito TT. 35, Gloster Meteor F. 8, Meteor T 7. For instruction and training flights the flight also had some DE Havilland vampire T. 9s, hawker Hunter F. 4s, Hunter T. 7s. The aircraft of the target towing squadron were housed in the hangar of 402 near the South West of the Station. Therefore, the unofficial designation of weapon training squadron 402 was used at the time. For patrolling and securing the range area, as well as for rescue and training operations Marine Craft Section boats were stationed at List and Hörnum, Bristol Sycamore HR 14 rescue helicopters were Also station at RAF Sylt. Air traffic control boats and HSLs were stationed in the port of List at the beginning of the fifties (see pictures) D Boats In 1954, the decision was taken to replace the air traffic control boats and the HSLs with RttLs mk2s Rescue Target Towing Launch. As part of the rebuilding program to help the German economy the boats were designed and built by Krogerwerft Yard at Rendsburg. (Later taken over by Lursson ship builders) and were numbered D2762- D2766 these boats came in service mid 1955 which explains why my Father severed on both HSL and D-boats (preferring the D-boat) D2762 and D2765 Based Hörnum, D2763 and D2764 from List, with D2766 as a reserve boat in the event of maintenance or breakdown, Their design was very different to any other boats in the Marine Craft Section/unit more like the German Schenllboot or S Boot (allied code name 'E' Boat which my father always used), with flared bows and rounded bilges and powered by high speed diesels. The D boats were fitted with winches for Target Towing, these were removed as the boats duties were change to Range Safety and ASR These boats only served with the RAF, until 1961. Two were sold to the south African Air force D2762 and D2764 in1961, and the other three handed over to the Federal German Navy in 1961. All were subsequently used as ASR craft. D- Boats in German service The German Navy, the “Bundesmarine commissioned them on 1.9.1961 as FL 9 to FL11 and were used by Marinefliegergeschwader 5"naval aviation Squadron 5” Until end of September 1975. the three were termed as air traffic control The fate of these three boats is a bit uncertain, one of these boats was in the process of being sold as NVG S1 as a North Sea supply boat, this deal fell through and the boat was sold to private owner in Italy (no further record for this boat found) the other two boats are said to been scraped or de-commissioned , however these boats are quit properly the two that ended up in the service of the Spanish customs service as cutters, after they were confiscated when smuggling, I have tried to contact the Spanish about these boats but have not heard from them and presume they were scraped or sold in to private hands ( there is the suggestion that they were driven on rocks and sunk, no evidence found) D-boats of the South African air force/navy The two boats that were obtained by the south African air force in 1961 were originally known as R30 and R31 and they served under SAAF until 1969 when the unit was taken over by the south African navy and R30 became P1552 and R31 became P1551 these were changed again when holiday makers referred to the boats as PISS1 and PISS1 too R30 to P30 and R31 to P31. Both these boats were diffidently sunk R30 Lost off Saldanah Bay on 7 October 1988 after striking a reef off Danger Point. R31, near Cape Point, after she grounded through contaminated fuel issues There are somethings about these boats that strike me as odd, The originations that took over these boats, they don’t like to mention the fact that these were ex-RAF or British boats, There is no record of the Spanish boats, it is said that they were sunk but no details are available except what is said on one form. I think I have done as much looking for information as I can, most of the bare facts are stated so thanks to all those web sites and forms that I have used and the pictures I have used I would like to thank to Dave M for the drawing And thanks to the marine craft branch museum for their help and for putting me in touch with Mr Rick Mortby who built the museums model of the D boat And a big thank you to Rick Mortby for the scale drawing and for his trust. And to Dr Christian Ostersehlte historian for Lurssen shipbuilders for the pictures of my Fathers boat D2763 and now I can start the building of the model D boat

Jet Sprint Boat by Rod Commander   Posted: 2 years ago
Hi You can source the jet units from Gravitix I am looking at the 50 mm unit Watch the progress on the hull and if you still want one just let me know Can't give you a price at this stage as development Costs are ongoing at the moment Nice to hear from you Cheers

Jet Sprint Boat by Rod Commander   Posted: 2 years ago
Have been trying to source a 1/4 scale hull for a jet sprint boat but not successful so decided to make my own Borrowed a small model identical to the one I wanted and set to scaling it up by 2.5 times I have shown the start of the journey and will continue to post development until it is in action Have sourced 1/4 scale driver and navigator together with jet unit and electric water cooled motor which will need to produce 3 to 4 hp to drive the jet unit shaft Hope you all like it because it's been really interesting so far I should be in a position to pour the mould shortly and then have a fibreglass hull taken off😆

Sea Breacher by Dave M Fleet Admiral!   Posted: 2 years ago
Hi Hugh I do believe Brian used the Graupner water jet unit which had it.s own seals. The model was sold on some time ago so can't check. I will ask Brian when I next see him and update the post. As far as I remember water ingress was not a particular problem. Dave

ESC problem by Dave M Fleet Admiral!   Posted: 2 years ago
Hi Ashley Welcome to the site. With such high currents it would be advisable to fit a fuse in the wiring to the battery. I would reiterate Haverlock's advice, LiPos need correct handling in both the charge and discharge. The lowest recommended charge (should be with the paperwork received with the battery) for your battery should be observed and should be set in your ESC. Don't store them charged, the safe voltage is 3.7volts per cell and most decent chargers have a facility to discharge to this voltage. A Wattmeter would be useful the check the actual current under load. Exceeding the motor or battery rating will cause damage and for about £20 a Wattmeter will save you time and money. The Graupner Jet Drive is interesting to me as I am awaiting two jet propulsion units from KMB for my Shannon lifeboat. There is a max rev limit of 20000 revs on these units so it is important to match the brushless revs or risk damaging the bearings. I can't find specs for the Graupner but I suggest you check your documentation. Good luck and please keep us posted. Dave

ESC problem by sheaffy Seaman   Posted: 2 years ago
Hi there, bit of a newbie to ESC's Need some advice on what AMP rating to get for the current setup any and all help is appreciated. Prop -> Graupner Jet Propulsion Unit 5 (2347) (G2347) Flange Diameter: 78mm Shaft Diameter 7mm Motor -> Graupner HPD 2948-3760 7.4V Brushless Motor Operating voltage range : 7,4... 24 V All-up weight, approx. : 180 g Free shaft length: 10 mm Output : 2000 W Number of poles: 4 Permissible motor direction : R und L Case length: 58,2 mm Shaft diameter: 4 mm Max. charging rate: 105 A Case diameter: 29 mm Revolutions/Volt: 3760 Part No: G7757 Battery ------- 7.4v 2s 40c 5600mah Boat -> Weight: will be 8 Kilos once equipment fitted. currently around 5 kilos. length:1.3m I hope that this information is suitable and can help with my question. many thanks 😀 Ashley

700 to brushles direct replacement by Derek Commander   Posted: 3 years ago
Have an old Billings jet boat that goes (ok) but needs at least 14v. Finding speed controllers is a struggle. SO, does anyone know of a brushless motor that could be a direct mount in the jet unit. Thanks Derek.

Old speed controller by Derek Commander   Posted: 3 years ago
HI Dave I acquired a Billings Palm Beach jet boat from around the late 90's with a 9.6v 700BB turbo. Was on 8.4v, I put 12v in, much better. I was told that this jet & motor unit runs well on 14.4v. So as its a mans thing for MORE POWER, I fancied trying it. I do have a brand new spare motor laid around if needed. I'll just bide my time until I stumble across one. G oing to give a 3 cell Lipo a go to see what happens (less weight). Just need it to stop raining on club sailing days 😀