Hearse

[ernie wrenn]

It is STREET LEGAL!!!!! With power seats, A/C, cruse tilt stero and rear view camera..

Beat that!

Ernie

[ernie wrenn]

Here is a link to COMPETITION PLUS.... ARTICLE ON HEARSE

www.competitionplus.com/drag-racing/news/17070-a-new-twist-to-ernie-wrenns-flying-circus

I am the fat guy... the time quoted is 1/4 mile..

Ernie

[ernie wrenn]

Pulled the fuel A/B tank today... I am going to put the fuel pumps under the car so they will "flood prime". Damn tired of fighting a lean start condition.

We moved the main pump yesterday... turned on switch and instantly had a 12# head pressure at the main turbine pump.

Our fuel lines are #24 and approx 6 ft long... looks like I tried to over engineer the original design..

Ernie

[ernie wrenn]

Went back to the track Saturday 04-02-11 .... Ready to rumble... Film crew ready to go..... BEAUTIFUL weather..... 30/40 MPH gusts.

Fire dept shows up and said "State NO BURN condition because of the wind". DAMN..... Call producer and advised situation.... Ok ;(... not happy, buts understands.

Producer did state that the series has been "picked up" for next season and wants the footage.. Set up temp shoot for 04-06-11... No go, Photo group must shoot in Atlanta.

We are HOPING to shoot again 04-16-11 if the frogs do't rain and the plague has not arrived.

1 GOOD bit of info..... My daughter is going to have a Boy!!! Now got to get him interested in turbines... How about playing turbine and jet sounds in the womb? YES!!! GREAT IDEA!!

Where are the head sets, MUST modify!!!!!?

Ernie

[turbochris]

Congrats Ernie. That kid has a hell of a grandpa. Try not to corrupt him too much. I need a lightweight test pilot, if your grandson is half as crazy as you are then I think I found my man.

I don't think he'll be afraid of loud noises........ or fire

[turbochris]

Hey Ernie, found a swingset at a garage sale, I think I can make a decent centrifuge out of it. Lets get grandson some G training. I haven't found a kiddie pool deep enough for a neutral buoyancy tank. Your in womb training ideas sound good but I think in womb G training may not be such a good idea.

[ernie wrenn]

Went to the track last night to do a couple of run ups..After all the little grimlins,,,, I ROARED to life just like in the movies!!!!!

Moving the lift pumps under the vehicle was the biggest improvment. I also install a "gas prime system" that puts straight gas to the head of the main pump.

Starts were smooooth and gentle. EGT's 1000', rpm 105% no overheating problems or lean conditions. I must learn to go completely "off" on throttle control or you get a hot fuel problem in the pipe, it is just the excess fuel burning off,but I don't like fires in tail pipes when the engine is off.

It could us more fuel in the A/B in my opinion..... even though the flames are nice hard and pointed... never enough.

We took video and I will get it uplaoded today and post the link..



Doing more filming for Speed Channel Sunday and will post video on that also..

Ernie

[ernie wrenn]

Looked at the video and decided the A/B is not getting enough fuel. So here we go again...

We rolled a .500 x .040 wall stainless ring to go behind the Flame holder. Drilled 96 holes (.075) in 3 patterns to get a large dispersion area. Drilled through the A/B wall and will feed the ring from both sides with a # 10 line going to a #12 split coming from the pump..

[turbochris]

which way are you spraying the fuel? upstream or downstream?

[ernie wrenn]

EVERYWHERE!!! back/45/90 degrees. You can blow into and get no back pressure.

Holes are staggered. I took some pic's and will up load a few.

Ernie

[racket]

Hi Ernie

I've done another set of calcs on those hole sizes , first lot were wrong , I shouldn't rush calculations just because the wife wants to go shopping :-(

You got me a bit sidetracked with your 1200 psi blow off pressure , LOL, you'll probably be only needing 50psi for the blowoff :-)

Cheers
John

[ernie wrenn]

Racket

Somehow I lost all of your Calc's. , any way to reload?

I firgured that by using as much fuel as possible there should be no return.

Ernie
Ernie

[ernie wrenn]

Pic's of new AB augmenter ring for more smoke..

ernie

[ernie wrenn]

I added another set of holes before finishing the tube..

Ernie

[racket]

Hi Ernie

Heres the reply from the other Section ...............


Gunna do this from basics as somethings not making sense here :-(( .

Your engine flows ~50 lbs/sec -3,000 lbs/min , therefore you need a total of ~200 lbs/min of fuel , 50 lbs to the flametube, 150lbs/min to the A/B at an overall 15:1 A/F ratio

Your 96 holes will flow at ~60% effective area due to their sharp edge inside the plumbing .

Velocity at 1200 psi is ~400 ft/sec

96 holes at 0.075" dia = 0.4241 sq ins or ~a 3/4" dia hole

Therefore ~0.72 cubic ft per second or 43.2 cu ft/min or ~2160 lbs/min , way too much , lets go back to say 100psi , flow generally at square root of pressure so roughly 34.6 :10 ratio , still way too much at 625 lbs/min , 4 times too much , pressure needs to be super low , lets go to 10psi , sq root 10 = 3.16 , or a 10:3.16 ratio , still too much , bugger , you're gunna need a very low pressure .

When I did flow tests on my kart injectors , using 4 X 1/32"- 0.032" dia holes and 5 psi fuel pressure the 4 holes flowed 0.8 litres/min or 0.2 litres/min / hole , 96 of those 1/32" dia holes would have flowed 19 litres/min - 33 lbs/min of kero , if they were 0.075" holes that would be ~110 litres/min or ~190 lbs/min of kero ................still too much for you .

The AiReseach turbojet of c 1978 used 8 X 0.035" injection orifaces in its A/B flowing up to 2.5 lbs/sec of air , or ~5% of your engines air flow , therefore you'd only need 160 X 0.035" dia injector holes running pressures between 25 -50 psi above static gas pressures in your A/B , these should only be ~10-12 psig . ...............so a max fuel pressure of perhaps 60 psi with 0.035" oriface , with your 0.075 holes it'll be a max fuel pressure somewhere around 20psig, lotsa variables that could increase or decrease that pressure , but not by very much .

Hope this helps

Cheers
John