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>> Home > Tags > exhaust

exhaust
exhaust
Smoke generator by marlina2 Chief Petty Officer   Posted: 15 days ago
A bit of confusion over what i wrote last night (note to self dont mix the internet with rum) I did not use a piezo unit, I used ultrasonic units, the kind that are fitted to fire places to produce the smoke and flame effect. The water depth seems to be the critical factor in the amount of mist produced. I am not looking for masses of dark smoke just enough to simulate diesel exhaust. This was just a prototype that works quite well but I am going to revisit it and try to improve the output and look for an ultrasonic unit that will work at 12v

Smoke generator by marlina2 Chief Petty Officer   Posted: 16 days ago
I have made a smoke generator using a piezo transducer and a P68s variable speed brush less fan controller from action electroncs. The transducers tend to be 24v dc and are relatively cheap (£2-£3 each). I am using S3 lipos so I only have 11.4 available but a very cheap variable output unit gives me 24v. The fan is connected in-between the receiver channel for the throttle and the speed controller. The fan speed increases with the throttle and follows the throttle speed regardless of direction. The net effect is quite pleasing for diesel exhaust simulation, with a steady stream when the stick is centralised and the fan just idling. On fwd/rev throttle movement you get an increasing amount of exhaust dependent on speed. I have this installed in my Forceful paddler with twin funnels. The effect is quite realistic but can be difficult to see. I am looking for a another transducer that will produce more vapour. in its present configuration it will run for around 3 hours before topping up is required.

Smoke generator by jbkiwi Commander   Posted: 20 days ago
Been thinking how I could build a compact sealed electric smoke generator with a pump to push the smoke through the exhausts, along with the cooling water on my HSL. Are the model train smokers not big enough for your purposes. You could just copy one of those and enlarge it perhaps. From what I remember from my train days they were not too complicated. How about an upside down ic glow plug with a variable voltage regulator in the bottom of a tube with a low temp oil ? You could possibly use a small brushed ESC for the regulator and come up with a controlled drip feed replenishing system. Just seen a site SMOKE EL in Germany which makes smokers for ic and electric planes but they look expensive and complicated,- work well though,-vids on site.

All hooked up, nowt happens... by rapidair65 Seaman   Posted: 25 days ago
Arun now sorted. Programming card did not work so I translated the pidgin english instructions for the ESC and it worked using the Tx. I now have forward and reverse, correct prop rotation and no battery protection. Also the water cooling system for the ESC works with the water exiting from the exhausts on the stern. On the down side the nav lights have stopped working! Pictures of installation and finished boat later.

Veron Tarpon by Biscuit Sub-Lieutenant   Posted: 1 month ago
Well I had one of these back in the early 1970,s been looking for years for another one must of been a rare boat. So I was surprised when this turned up on eBay last week. So I had to buy it, the seller did not mention that the engine a Merco 35 was locked solid and all the head bolts were missing and the whole inside of the boat was soaked in sticky castor oil exhaust residue, but this is how I like them loft fresh and not messed with. I don’t think it’s hardly been used, I managed to get the engine apart after heating it up with a blow lamp looks like it’s hardly been run but the liner got a fair bit of rust on it so not sure I can use it. The only thing to remove the sticky castor oil was 25% nitro fuel, the one I bought in the 70,s cost me £27 this wreck I bought in 2018 £70 but I will enjoy restoring it, this is the boat as how I got it and now with the engine out that was another nightmare 😁

HMS M.33 by RNinMunich Fleet Admiral!   Posted: 1 month ago
"Manxman was about when I was in the RN in the sixties." Yes Nick, but by then apparently not in her original form, role or speed! Cheers, Doug 😎 "Summary of Post War Service. HMS MANXMAN was first deployed to support the repatriation of British and nationals of allied nations and carried stores and supplies from Sydney to Japan. On later trips she went to Shanghai and Hong Kong which was used as the base for the BPF in 1946 and 47. In June 1946 the ship returned to UK and was refitted at Sheerness before returning for further service with the BPF in February 1947 as relief for HM Cruiser EURYALUS. At the end of that year she was nominated for reduction to reserve status and returned to join the Reserve Fleet at Sheerness. In 1951 this ship was brought forward for operational use and following a refit joined the Mediterranean Fleet in September 1951. After two years she was again placed in Reserve and laid-up in Malta where she remained until again refitted. The after 4” mounting was removed and she re-commissioned in February 1956 for duty as Flagship of the Mediterranean Fleet Flotillas. During this service she took part in relied operations after an earthquake in the Lebanon as well as taking part in NATO and Fleet exercises in the Mediterranean. She was deployed for headquarters duties during the Suez operation later in 1956 and the next year returned to Malta to lay-up in Reserve. Refitted for further service after tow to Gibraltar in 1958 she returned to lay up Malta until 1961 when she was selected for conversion into a Support Ship for minesweepers at Chatham where she was taken in hand by HM Dockyard on 17th July that year. During this work the other two 4” mountings and two boiler rooms were removed which reduced her speed significantly. Additional accommodation and support workshops were fitted to suit her new role and work was completed during February 1963. Whilst on trials in April 1963 she visited the Isle of Man where she grounded whilst in Douglas Bay. On returned to Chatham the ship prepared for service in the Far East and re-commissioned on 23rd September that year for support of the 6th Minesweeping Squadron at Singapore. She deployed in that role until late in 1968 and arrived at Portsmouth on 12th December." "In reserve at Malta and refitting She was refitted in Chatham in the early 60's and converted to a minesweeper support vessel. When the forward boiler was removed and the compartment was fitted with diesel generators to supply outboard power to minesweepers, she was fitted with a dummy forward funnel, which housed the diesel exhausts and ventilation for the compartment. Much of the mine stowage was removed to make way for additional accommodation. Commissioning in 1963, she was subsequently stationed in Singapore. Returning to the UK in 1968, Manxman was used for engineering training at Devonport and following a fire, was transferred to the reserve at Chatham Dockyard until broken up at Newport in 1973."

Voltage increasing via regulator by RNinMunich Fleet Admiral!   Posted: 2 months ago
A somewhat confused question if I may say so Eric!😲 You can't 'regulate up' only down. The regulator's job is to produce a constant lower voltage from a range of higher voltages. I often use one to produce 5V for the RX and servos from a 12V SLA drive battery. A little 3 legged device (type LM7805) which looks just like the power FETs in a high current ESC. My version of a UBEC! 😉 What is this 'regulator' you have? Type number? Manufacturer? Photo? To get 12V from 7.2V you would need to use a Voltage converter (also known as an inverter). This works by converting the DC input from the battery to an AC voltage which can then be increased using a transformer. More elegant (and expensive!) versions use a transistor oscillator and amplifier. This uses hi-power transistors instead of the transformer. The AC output of the transformer (or amplifier) is then rectified back to DC. All this is very inefficient which is why it is normally only used for very light currents, where the losses are not so significant, and when there is no other alternative, not often the case! You can't beat the physics and you will never get the same power out that you put in. This leads to a basic design question:- What is the total current consumption of the load? I.e. the motors. A simple example:- Let's say that at 7.2V the motors draw 10Amps total, i.e. 72W (or VAmps). Assuming a utopian 100% efficiency at 12V this would equate to 6A. Due to the three stages of conversion; DC to AC, transformation / amplification of AC to 12V, AC back to DC, you'll probably be lucky to get an efficiency of around 60% to 70%. Thus if you stick 720W in you'll get around 430 to 504W out. Not much of a gain is it!🤔 Your battery would be exhausted in about 2/3 the time it is now 😡 If your motors draw more than 10A the problem just gets worse. So what is it you really want to do? If you just want to up the volts to your motors stick a 12V SLA or an 11.1V LiPo (3S) in and hope that you don't cook your motors! Frankly I don't really know why you're bothering, tugs aren't sprinters! If you want more pulling power with the existing setup try experimenting with prop sizes and pitch. Will probably achieve much more than fiddlin' about with voltage converters. BTW: All this assumes that the RX has it's own separate 5V battery supply or from a BEC in the ESC. Some clarification needed from your side. Cheers, Doug 😎

PS Waverley by Westquay Fleet Admiral!   Posted: 2 months ago
Thanks for the offer, Marky, but it's specifically the Waverley we need drawings for, or rather the superstructure. Sarik have a set, but hardly exhaustive. I suppose general dimensions and all the hundreds of photos will have to do, unless any of you guys know differently. I was going to ask on Paddleducks but they are talking closing down for lack of use and age of the membership, so no point asking there. Doug, can you imagine the repetitive stress problems of twiddling a pin chuck that many times? I have a lovely old fine feed pillar drill, but it's in bits being cleaned and repainted. Cheers, Martin

Kingsmere Model Boat Club by Slowboat Seaman   Posted: 2 months ago
All very frustrating, has anyone compiled an exhaustive list of ponds where boats can be used?

Kingsmere Model Boat Club by BOATSHED Fleet Admiral!   Posted: 2 months ago
I do have several model boats with both petrol and nitro engines in them. One I have is a 48" PPT109 with a 26cc petrol engine and the exhaust has the water cooling going out via that way. It runs at a pleasant hum rather than the normal engine sound. It is a lot quieter than someone using a petrol lawn mower or a petrol strimmer. It is even quieter than most brushless model boats. Yet I am not allowed to use it on a pond on Blackheath just because of it's fuel system. I'm told that it's due to sound rather than fuel. The local council have a ranger that comes round and give you an £80 fine if you are caught using one. I find this totally stupid when they use petrol lawn mowers and strimmer's to keep the whole of Blackheath's lawns cut. I have a Proboat Miss Geico tunnel hull model boat and the motor screams when it's running but I'm allowed to run that on the pond.

Launch ELAINE, by onetenor Fleet Admiral!   Posted: 3 months ago
Re that jacket. It may be easier to shift than you think. It looks as though there are soldered over screws round the top.If you can remove them the jacket might just prise off. The exhaust stubs just unclamp.If you can get that off you may then be able to see what motor you have. I see a likeness to one of the E.D. 1:49s👍👍 P.S. Colin can you tell me the proportions of diesel and Methanol you used please ? I'd like to try it for myself. What gave you rise to think it would work? I'm really fascinated by this. Regards John👍🤔

Launch ELAINE, by Colin H. Fleet Admiral!   Posted: 3 months ago
Thanks Doug, have just had a scout round the Web, from what I can see on my engine it's more likely to be a Mills. But without removing the water jacket and exhaust covers I've no idea. Cheers Colin.

Launch ELAINE, by Westquay Fleet Admiral!   Posted: 3 months ago
Usually diesels don't throttle reliably as if left ticking over or even running slow they cooled to the point where they'd still run but not pick up to accelerate. Except the superb ED Super Hunter 3.5cc, which never went off a 2 stoke even when slowed, unlike all other small engines. It had a throttle in the exhaust right up next to the exhaust port and was a superbly controllable engine. Never could get hold of one. Frankly I'm astonished you could get anything out of such a mess of an engine, but congrats and good luck with it. Martin

Launch ELAINE, by Westquay Fleet Admiral!   Posted: 3 months ago
Fantastic stuff, Colin. If you can get that ancient engine to run on diesel from your car plus Methanol, you could get that kitchen nozzle going! Where did you just get some methanol from? I'd say the engine is something like an old ED Competition Special or similar with a very home made water jacket and even more home made exhaust wrapper, requiring tubes to be added to the 2 stubs and led to the stern or either side. Doug's yer man for anything lecktrickal. Is there actually anything of the original RC in there apart from that superb kitchen nozzle affair, which deserves to be preserved all on it's own. Control will have been vestigial at best as the engine has no throttle and the nozzle arrangement will not have had any level of proportionality to it. It will, at best, have been push the button and see where the boat ended up, knowing it could, at a a pinch, be brought back to where it started. At one time all RC was like that. My own REP set was left,centre, right, centre, etc. A wonderful throwback that must be preserved. I wish my local junk shops had stuff like that! Cheers, Martin

Launch ELAINE, by Colin H. Fleet Admiral!   Posted: 4 months ago
So far, only checked the engine, it ran using a little diesel from my car mixed with a few drips of methanol. Throttle spring broke and the flames from the exhaust were about 4 inches long but it sounds healthy enough. As for the radio gear I'm afraid I don't have a clue. Have managed to get the rudder nozzle gear to move using 6 volt battery, but all the connecting wires are missing. Lots of wood inside that needs attention, seems a bit too soft. Cheers Colin.