Search found 4142 matches
- Sat Apr 17, 2010 3:23 am
- Forum: Valveless pulsejet forum
- Topic: Liquid fueling
- Replies: 16
- Views: 15685
Re: Liquid fueling
Bruce - You are quite right -- that works, and can be a useful training technique for beginners. The flaw is that a beginner may wrongly assume that every time he picks up the handle, "neutral" control will always be found at the most natural angle of the wrist. Once he learns that neutral may feel ...
- Thu Apr 15, 2010 4:35 pm
- Forum: Valveless pulsejet forum
- Topic: Liquid fueling
- Replies: 16
- Views: 15685
Re: Liquid fueling
Thanks, Mark -- I was actually surprised at how good an article that is. And, it is correct that, generically, we should call it "control line" flying since U-Control is, in fact, a trademark name. However, there are thousands of us who will always think of control line flying as "U-Control", especi...
- Wed Apr 14, 2010 11:27 pm
- Forum: Valveless pulsejet forum
- Topic: Liquid fueling
- Replies: 16
- Views: 15685
Re: Liquid fueling
Metiz - I hope you will forgive this blasphemy as it stems from a lifelong prejudice and will be slammed by just about everybody, but here goes: Why radio? If the point is to experiment with liquid fueling while training yourself to fly a model while at the same time avoiding the destruction of life...
- Wed Apr 14, 2010 10:28 pm
- Forum: Valveless pulsejet forum
- Topic: Big Linear FWE for a Paying Client
- Replies: 60
- Views: 52736
Re: Flameproof Fuel Line
Well, the rigid line worked great. However, my testing was finished almost immediately because I had under 20 lb of propane left -- in a matter of minutes the bottom few inches of the cylinder was frosted up, and the regulator would no longer respond to demand. So yesterday, I got the 50 pounder re-...
- Wed Apr 14, 2010 10:11 pm
- Forum: Valveless pulsejet forum
- Topic: Enics PuVRD M135
- Replies: 4
- Views: 6860
Re: Enics PuVRD M135
Nice find, Jutte! The Enics stuff is always so beautiful to see. Man, I always think it would be so much fun to be able to see their designs up close, like at a military trade show or something.
L Cottrill
L Cottrill
- Mon Apr 12, 2010 7:15 pm
- Forum: Valveless pulsejet forum
- Topic: Big Linear FWE for a Paying Client
- Replies: 60
- Views: 52736
Flameproof Fuel Line
I added a 5 ft section of 3/8 inch OD brake line to completely isolate the fuel hose from engine heat and flame. I reduced the hose length from 8 ft to 4 ft so it's just a short link to the rigid steel line. I put three bends in the line so that it's stable on the ground, not just dependent on the f...
- Sat Apr 10, 2010 4:37 pm
- Forum: Valveless pulsejet forum
- Topic: Big Linear FWE for a Paying Client
- Replies: 60
- Views: 52736
Re: Big Linear FWE for a Paying Client
"An unfolded FWE, not for propulsion. The client wanted high tail flame temps AND velocities. Exact usage is proprietary." If you ever find out or can say in the future, I'd be curious what he's planning to use it for. I'll be able to reveal it after his patent is granted. In the meantime, I have l...
- Sat Apr 10, 2010 2:32 am
- Forum: Valveless pulsejet forum
- Topic: Big Linear FWE for a Paying Client
- Replies: 60
- Views: 52736
Testing the Big Linear FWE
Testing has been a rocky road. To start out, I was testing for a couple of weeks in February, but was hampered by terrible weather and got almost nothing accomplished. The client understandably became weary of this and insisted that I ship it down to Louisiana for them to test. It turned out that be...
- Fri Apr 09, 2010 9:21 pm
- Forum: Buy and Sell
- Topic: jetZILLA SportThrottle
- Replies: 7
- Views: 11035
Emergency Shutoff Really DOES Work!
About 45 minutes ago I was performing a test run of my big "industrial heater" engine, using the Sport Throttle attached to the output of a high-flow regulator. This was a high pressure fuel pipe test, with 60 PSIG set on the regulator. I got about a full minute of running, then suddenly the engine ...
- Thu Apr 08, 2010 8:00 pm
- Forum: Buy and Sell
- Topic: jetZILLA ProTuner Tuning Sleeve
- Replies: 0
- Views: 5033
jetZILLA ProTuner Tuning Sleeve
Yet another new offering, for serious experimenters only. Use this anywhere a permanent tailpipe tuning device is needed or desirable. For example, you might want to tune for optimum length because of altitude variations, experimenting with widely differing fuels, etc. Designed by Larry Cottrill, ex...
- Wed Apr 07, 2010 9:24 pm
- Forum: Buy and Sell
- Topic: jetZILLA SportThrottle
- Replies: 7
- Views: 11035
jetZILLA SportThrottle
I am now offering the following: 2010-02-22_002_crop1_small.jpg I don't have the sales page created yet, but you can order via PayPal. Note that this is essentially an "introductory" price -- it may go up some by the time I get the sales page up. It will certainly increase if the proposed Value Adde...
- Tue Feb 23, 2010 2:04 am
- Forum: Off topic forum
- Topic: Solzhenitsyn - Harvard, 1978
- Replies: 1
- Views: 3201
Solzhenitsyn - Harvard, 1978
This is long, but quite astonishing. If you think "all the prophets are dead and gone", check out what Alexandr Solzhenitsyn had to say to an audience at Harvard University on June 8, 1978. We should have paid attention ... http://www.columbia.edu/cu/augustine/arch/solzhenitsyn/harvard1978.html L Co...
- Thu Feb 18, 2010 10:01 pm
- Forum: Valveless pulsejet forum
- Topic: Just made a Advanced Focused Wave Engine cant keep it going
- Replies: 32
- Views: 24638
Re: Just made a Advanced Focused Wave Engine cant keep it going
Nick -
CONGRATULATIONS! There is nothing quite like the first time you get one to take off and really go for you. "So THAT's how it's supposed to sound!" Ha.
L Cottrill
CONGRATULATIONS! There is nothing quite like the first time you get one to take off and really go for you. "So THAT's how it's supposed to sound!" Ha.
L Cottrill
- Wed Feb 17, 2010 4:41 pm
- Forum: Valveless pulsejet forum
- Topic: Hey all
- Replies: 11
- Views: 11280
Re: Hey all
Vern - Well, these look great, but I'll run them with UFLOW when I get a chance (give me a day or two). You don't show any dimensions that locate the intake-to-chamber transition, but I can scale them. And with UFLOW I can adjust them fore and aft from there, to see what works. 2 inches would be pre...
- Mon Feb 15, 2010 10:51 pm
- Forum: Valveless pulsejet forum
- Topic: Big Linear FWE for a Paying Client
- Replies: 60
- Views: 52736
Re: Big Linear FWE for a Paying Client
First test session using the 50 lb tank. Still nothing better than some pretty loud growling. See video clip attached. I was actually able to experiment with the other fuel pipe a little, and I was able to do a LOT of playing around with the spouting location. The "low turbulence" fuel pipe was usel...