Placement of Nitrous Bottle

[donpearsall]

I am putting a 5lb nitrous bottle on my stock (unfaired) 1979 GS1000 to run in the fuel class. I am wondering where the least draggy position is for this bottle. About the only options I have for it are about 2' behind my left leg, or behind my back on the tail fairing. There his a lot of turbulence in both positions so I want to know what seems to be the least amount of drag. Expected speed is about 140 mph.

Any ideas which is best

Thanks
Don

[Speed Limit 1000]

How much do you think you will use in one pass?

[Rex Schimmer]

I think mounting it behind your a$$ would be the best place as this is a turbulent area and the bottle would just fill us some of that area plus it would be the easiest place to make a mount.

The answer to John's question, "How much do you think you will use in one pass?" is 'The tops of 4 pistons and the amount of nitrous to make that happen."

Good luck!



Rex

[Stainless1]

1 lb per minute = 10 HP.... roughly... using a 5:1 NFR by weight...
So you are going to need to carry at least 30 seconds worth of N20... plus a reserve to preserve pressure
I'm with Rex, put it behind you
How big the bottle and wallet are will determine how much you use per pass. 
 

[donpearsall]

Thanks for the info! I am going to put the tank crosswise at the back with about a 30-40 degree down angle.

If 1 lb/Min = 10 hp, then at 40hp (wet) shot with 30 second duration I should use 2 lbs in 1 mile. I have another 5 lb tank for the return run (hoping).

Don

[Seldom Seen Slim]

I can't find a pic right now, but the 10# bottle on my ZX12 was mounted (on an angle) between the driver legs/under the seat/almost to the swingarm.  With all due propriety I say:  The shutoff was in plain sight right between my thighs and so it looked like I was diddling myself if I turned the knob while sitting on the scooter.  The 10# bottle was way more than needed (100hp dry shot), but that was partly so we could run the air shifter on the nitrous, too - for quite a few runs.

[RansomT]

I use a 10# bottle.  Mine is mounted inside of the tail under the fairings on my Hayabusa, took a lot of "figure'n" to get it to work.  You can find pictures just by googling my name.  (Ransom Holbrook)

3 1-mile passes is all I could do before the bottle would drop below a level that would effect the pressure during a run.  With a full bottle, I could leave at 1000psi and be above 900psi as I passed the timing traps.  I left the line spraying (stage 1) and by 3rd gear was into to stage 2 ... all in by 5th gear.