hi im currently building another u2540 by robbe and i am looking to install a diesel sound generator for running on the surface - i want to be able to us the spare channel on my transmitter to be able to turn this off when going to dive - has anyone done this and is it possible - any information is appreciated thanks kingg...

Wait how big is the diesel engine and how are you going to control the engine in the first place? what happens when the diesel fuel runs out and the sub is unbalanced? I guess anything is possible if you see it in your head possible then it is.

These guys make great modules http://www.jjc-electronics.com/
Easy to use a spare channel to switch it off, either use a servo controlling a micro switch to intrupt power to the sound module or a neater way is to use an electronic switch like the ones Subtech sell. You may even be able to rig up a water level sensing switch at will automaticall switch it off when you dive, without having to resort to a spare rc channel.

Well i never knew that rc submarines had those well i guess its true you learn something everyday.

thanks all, used the microswitch with a small servo

It's not actually a diesel engine, more of a sound generator.

Hi kinggeordie.......... Do you have pictures of how you did the sound generator for the U2540? and which micro switch you used? We are also building one and could use the help............patsy

The sound generator dosn't take much power, why bother turning it off at all? When you are under the water, I doubt it will be audible from the surface.

yes heres a pic of the switch and servo the module is mounted under the reciever, it uses the tube to amplify the sound, so far so good, i still need to test it at distance and may need to put a small amplifier in but ill let everyone know after she has been in the water....

Thanks--------and what paint are you going to use? Color? Please post how the sound does when you put in water!

patsy ill be using a grey primer for the first coat then a lighter grey from the flood holes upwards just below the deck, also ill be putting yellow lines on the sail and the deck as this is how they would have looked when part of the training floatilla near the end of the war see pic, just i wanted to be different with this one, the last one i built was as per robbes specifications hope this helps

I would use a peizo electric speaker (they are waterproof, very light and should cost about £2)and place it in the conning tower for maximum effect.

Thanks Taxidriver.........just a few minutes before I read your post, I told someone that I bet they had waterproof speakers that we could put in the conning tower...............and low and behold! they do!!!! I think I have found some here in America that might work................and if this does not help me catch that man nothing will!!! Thanks sooooooo much!!! patsy