Large Model Association Forum

before i start taking a drill to a very expensive header and can

50cc header to cannister set up

been ask to install smoke tank and pump to edge 540, no nipple up at the header

where is the best place to place nipple & how far off the header does the smoke nipple have to be ?

s shape header to cannister photo will follow

Place the nipple 20 to 25mm from the cylinder exhaust flange and drill a .5mm hole, this will give you good smoke, with smoke fluid or diesel slightly thinned with paraffin. If you need more smoke or your pump is not very powerful go to .75mm hole. smoke works best from half to full throttle only, and don't forget the one way valve to stop the tank being emptied via the vent. The tank should be set up the same as the petrol tank = clunk, feed, fill and vent with fill plugged when flying. # I make my preferred system with a1.5 mm hole in the exhaust nipple flattened out to spread the fluid spray and then control the fluid flow with a 'slug' in the fuel line drilled with the .5mm hole. back from this is the one way valve, then a screen washer pump, then the micro switch operated from the arm of a servo. Simple but fool proof. Run the pump on 6 to 7.2 volts. HM government warning Smoking is Hazardous to Health.

the pump is a variable Sullivan Skywriter Smoke Pump

tank is a dubro fitted as petrol tank

was thinking usiing this

http://the-mt-shop.co.uk/product_info.p ... cts_id=402

http://the-mt-shop.co.uk/product_info.p ... cts_id=119

this is the set up but not drilled yet

best place for nipple?

using a just engine smoke nipple

You cannot put a smoke nipple that close to the flange on a canister set up, it will suck fluid into the engine, foul the plug and reduce power. On the Zimmermann set up you have its designed to have the smoke nipple in the canister inlet tube, just in front of the canister body. Either way you cannot tap the 0.5mm thick stainless tube, it will need a bulkhead fitting or as designed brazed in tube.

i did plan on sliver solder the nipple as a precaution.

please can you point me to the correct nipple and mark on the photo where the nipple needs to be put if you need more photos let me know i will email you them.

u can call me if you wish

is this what you had in mind drill, tap and solder a nipple in a similar position

or this set up

or put is half way down on s bend at joint?

one way no return check valve in place on black line

Re: smoke nipple advice
Report this post
Quote
Postby Dave Wilshere » January 28th, 2019, 11:30 pm
You cannot put a smoke nipple that close to the flange on a canister set up, it will suck fluid into the engine, foul the plug and reduce power. On the Zimmermann set up you have its designed to have the smoke nipple in the canister inlet tube, just in front of the canister body. Either way you cannot tap the 0.5mm thick stainless tube, it will need a bulkhead fitting or as designed brazed in tube.
Good point, when using a tuned canister the back pressure is probably greater. I tend to make my own silencers and I link the smoke switch to the throttle position so it only operates from half throttle upwards. I have not experienced any problems as you describe, probably due to my crummy silencer design. I always silver solder a m4 nut on the exhaust pipe and use a piece of threaded rod with a locknut to be able to drill the entry hole in.

sorry to be a pain but i am a little confused on where to drill and solder the nipple?

as above- "just in front of the canister body."

Bob Thompson1894 wrote:as above- "just in front of the canister body."

you mean like this but with nipple

how hot does the oil have to be to vaporise

using MT oil

richard armstrong wrote:

Bob Thompson1894 wrote:as above- "just in front of the canister body."

you mean like this but with nipple

smoke_da150sd.jpg

I was simply quoting the excellent advice given to you by Dave Wilshire above. I suggest you read that carefully.

Bob Thompson1894 wrote:

richard armstrong wrote:

Bob Thompson1894 wrote:as above- "just in front of the canister body."

you mean like this but with nipple

smoke_da150sd.jpg

I was simply quoting the excellent advice given to you by Dave Wilshire above. I suggest you read that carefully.

thanks bob

the exhaust is a custom made and cost over £250 so i want to make sure that i do it correct its a one shot deal so i cannot afford to fuc it up

mountain and molehill springs to mind.

sorted decision made and client happy

Client ?

Glenn Masters wrote:Client ?

a mate who need help and is paying for parts upgrade

So how much are the folk who told you how to do it getting as their share?