DYNA-JET

Has anyone every flown, or watched a flight of a Dyna-Jet powered control line plane? I've heard it took 5 people: 1 to fly, 1 to launch, 1 to pump air, one to pump fuel, and 1 with a fire extinguisher. Correct?

Trash, I've seen plenty and you've got it about right.

We use to fly with 3 people, never had problems.

You can do it with two if you are both in good shape and can move and think fast enough.

Jake

>You can do it with two if you are both in good shape and can
>move and think fast enough.
>
>Jake

Ron B.
F4Fguy

Yup!That's right!Especially the last part!

Lucky Me, I had the speed boys blast one off in the middle of an official wingover! Now THAT'S a thrill!

Larry,

It might have been me that got you on the wingover. I got Kieth Trostle on a wingover too. He let me know. Not intentional on my part. My starting crew (2) has control of that end as I'm out on the handle. We really don't try to catch wingovers although that is the most effective spot in the pattern especially while setting up for the inverted recovery. Being a Stunt flyer myself I try not to do it too often as sometimes those guys are judging me. Sometimes the crew is aware enough and holds off until after the stunter has landed. Not nearly as effective that way though. Probably see ya in Tucson. I'll have a couple jets with me there as the next weekend is a Speed Contest.

LAST EDITED ON Mar-08-04 AT 12:54 PM (CDT)
 
>Lucky Me, I had the speed boys blast one off in the middle
>of an official wingover! Now THAT'S a thrill!

The very first time I ever saw/heard one run, it was because it fired up in the middle of my vertical 8 on an adjacent circle. It was a scale model so it ran a relatively long time and I had to judge the egine shutdown on the feel of the vibration.

>>You can do it with two if you are both in good shape and can
>>move and think fast enough.
>>
>>Jake
>
>Ron B.
>F4Fguy
>
> Yup!That's right!Especially the last part!
>

And of you're not fast enough, something catches fire. What more could a boy want?

Two can work. One to fly, one operating the nozzle of an air tank and launching, with a probe type sparker up the tailpipe. Wouldn't hurt to have a fire extenguisher handy, but no operator req'd. I'm not sure why anybody would want to make that much noise, voluntarily. Ok for New Year's Eve, but otherwise, not good for the sport, IMHO. I flew one of the late Jerry Thomas' jet speedsters for a few flights. They don't pull as hard as a .65, despite similar weight and speed. I didn't like the way the (monoline) controls were setup...no down control...not good for a windy day, IMHO. Steve

Mike Couts loves to fly them. I watched jet speed at the 2003 Nationals and had a good time. Impressive piloting!

SK

Here is a picture taken yesterday at Muswellbrook, New South Wales, Australia. The model is John Walker's Australian record holder for "sports jet". John is waiting at the handle while the pit crew (three men) start and launch the model. The motor started instantly after the first pump. It slides across the grass (no dolly) and achieves flying speed within a quarter of a lap. In all a most impressive sight!

It's what called me to fly on summer nights in Fargo, I would hear the dynajets at the flying field about a mile away. Then I would tell Mom I was going flying, hang the cardboard Sig box over the handlebar, and tuck the Ringmaster under my arm and ride my bike to the park.

>It's what called me to fly on summer nights in Fargo, I
>would hear the dynajets at the flying field about a mile
>away. Then I would tell Mom I was going flying, hang the
>cardboard Sig box over the handlebar, and tuck the
>Ringmaster under my arm and ride my bike to the park.

Hey Zeke, I competed in speed at the Fargo annual contests during the early 60's and remember well Mike Hoyt and his lovely wife, the Olson family and Everett Dunkin firing up their flame throwers. Gads, the sound still rings in my ears. The sound files that are available for download simply don't do these machines justice. Although I never flew a Dyna Jet I do have one and hopefully one day I'll build a scale model Fury or Mig 15 for it.

Oh yes. I remember one very exciting time when Bob Parker and I were walking across a taxi strip when a Dyna Jet powered speed ship came flying by in front of us (barely) at about 200 mph!!! As I heard it told, the thing got away and had no line hooked up! This was at the 72 Spokane Internats at the Air National Guard base. Loud, too close. I have seen them set the grass on fire too. Not to worry, the weeds burned up too. Cleaned the field real nice.

I saw one spinning around on the ground once, at the Nats. Made a mess of the lines. Once it ran out the fuel, the pilot started winding up the wire hand-over-hand (probably went into the trash directly afterwards). The lines looked pretty darned thick when he walked by me and I had a look.

Ty,

What happened at the Spokane Internationals was that the pylon broke while Ron Ivaldi was flying at over 185 mph. He went down hard and his model hit the ground hard and the engine broke loose and skidded about 1/4 mile up near the racing/carrier pits where it went into the grass and flipped and stopped. Luckily it didn't hit anyone or anything but did come close enough to get everyone's attention. I've seen two pylons break during fast jet flights and they aren't pretty. I have the Hi Point perpetual trophy from that contest as it was the last Spocane Internationals held. Gee that was 32 years ago. How time flys.

Right, Bob and I were going over to the carrier contest. He had a Sky Raider for carrier II. You had that big bad white Buick that whistled as you passed me on the way to Spokane at about 90 mph. My Ford wagon was doing 70 when you went past with the big grin. Wasn't your speed plane called "The Rapid Apparatus"?

LAST EDITED ON Mar-08-04 AT 07:23 AM (CDT)
 
Jerry Hicky put one on a DeBolt Stunt Wagon in Binghamton NY about 1956.I remember three short flights before it burned off the tail sitting on the ground. This was at a school and the police didn't show up. How things have changed.
Ed

Hear some here:

http://www.pulse-jets.com/pulse3.htm

One other Dyna-jet tale.

I attended a flight demo at a ball park in Florida when I was a kid. They fired up and launched a Dyna-Jet (the first I ever saw) and it promptly injested a land-crab. What a mess! Poor thing probably lept out of its hole when the noise started and happened to be exactly in the wrong place.

I remember seeing one fly in the late 70's at the DCRC field in Montgomery County Maryland. I don't remember much about the model except it was metal and a typical looking speed plane.

However, I do have a clear memory about the speed of the model and the noise! Loud would not quite explain it. That was the first and only time I have ever seen one. Sure would like to see one fly again...

At the '71 or '72 Nats they had a circle next to the last hangar of a row. We were flying free flight out the runway that was aligned with the hangar row and out 3/4? of a mile or so. They lit off a Dyna jet and the effect was deafening. Between the Doppler and the echo it was unbelieveable. I love Dyna jets but never flew one. I have some jet plans and I think that will become an engine project in the future.

Saw an RC delta fly with 3 Dyna-Jets, incredible sound, and soooo fast, could be heard 8 miles away..!!

Good flying

LAST EDITED ON Mar-09-04 AT 01:18 AM (CDT)
 
BWAHAHAHA!!!

http://www.dynajet.com/

To see them by day is pretty special, but at night it's a whole new ball game! Totally awesome! Not just the noise which takes on an even more brutal tone in the darkness but the added semi pyrotechnic show of the exhaust flame and red hot tail pipe leaving a trail through the air like an enormous Catherine wheel. I won't forget that sight in a hurry. Very impressive. I think it was our MAAA president of the time David Axon who was responsible. I think it was at a Wagga Wagga nats some 10 years ago.
I'd pay to go and see a show like that again.
Cheers John

John,

Do remember seeing any shock diamonds in the exhaust?

LA_Flyer

When I was a kid back in high school in 19 *mumble mumble* we had some sort of science exhibition on the stage in the school auditorium. What did they drag out? A pulse jet. I still remember the demonstrators asking everyone in the front rows to keep quiet so those further back could hear it

My next encounter was at a night time model aircraft demonstration at the Ipswich (Queensland) show grounds with around 3000 people in the stands. I was to be the last flight with my stunter before our time was up and part way through a Dynajet started up in the other circle. So there I was flying around wondering if my engine was still running with this screaming thunder in my ears. By some enormous coincidence both our engines stopped at virtually the same instant and we both glided in to land. I'm sure the crowd thought it was all planned that way

Downunder I had the same program in 9 grade and the guy had the Dyna Jet on a wagon. They lowered the lights and he set if off with three pumps. It ran about 20 seconds. They are loud outside but inside there is no way to describe it.It glowed super bright in the dark room.
Ed

Had the same experience in the 10th grade. Didn't hear any of my teachers or the bells the rest of the day.

I'm lucky in that there are several people in the area who fly them. Last year one broke loose and went scooting about 1/4 mile across the grass, a road, and set the grass on fire on the other side. Back in 1969 I had a chance to see an all metal RC F-102 Voodoo with two jets fly, not too fast but really loud.

In 1990 we had the national fly in here, there were about 500-1000 people watching the RC planes until we fired up the dyna-jets.

At the '58 or '59 Criterium d'Europe in Belgium - Saw Ivannikov? set his world record at 186mph, at dusk. Most impressive, red hot tail pipe going round, and the shock wave pattern in the flame emerging from the pipe. Easy to time, even though it was nearly dark. Plus I think it was the Italians, had a pulse jet stunter. Not too aerobatic, but achieved loops, bunts, and inverted O.K. Also very impressive. So quiet when it stopped!

I have one official flight on video from the '89 Tri-Cities, WA NATS.

You're right, the silence is deafening when they stop.

One can only imagine what the full sized V-1s sounded like over London. My old man heard them enough times. As long as you could hear them you were safe. Once they stopped, that's when to ducked for cover. The V2s came in supersonic so there was no noise until the BOOOM!

I also once worked with an old German U-Boat navigator vet. He said being on the wrong end of a B-17 raid wasn't too pleasant either.

The absolute worst had to have been the B-52 raids over Hanoi/Haiphong at the end of VN.

I grew up around them as we had more speed and combat flyers then stunt
We strapped one on a bicycle and ran that.Great fun taking turns going deaf.Having the whole town after us to stop the noise was another thing. Even so they were a lot more tolerant in the 50's and 60's
In the service in Korea we picked up the small mini jets and the metal kits for them. We wern't able to get them running on gasoline but they did run remarkably well on K&B500 glow fuel. It ran with a tell tale flame out the pipe that at dusk was in the modern term Awesome.
Final runs were down at the old Don Mohr's hobbyland with Bobby Mohr,s jet. I sold my last one to his father for $35.00. Who knew that they'd be worth over $200.00 today.
Dennis

For you people that have never had the oppourtunity to hold one ,
it,s quite an exrerience.
Very little pull;especially for somthing that loud and big.
Absolutly No vibration(Or maybe I was too scared to feel it,)
mY understanding is ; if you use flimsy reeds they dont go as fast, but run steady.If you sse stiffer reeds they will go faster, but the leasst little bump on takeoff or any type of missfire causes them to quit instantly.
And do they ever heat up in a hurry.THE TAIL PIPE TURNS CHERRY RED, followed by bad happenings if held on the ground too long .
Loss of neighborhood flying site can be almost guaranteed by flying one.

>And do they ever heat up in a hurry.THE TAIL PIPE TURNS
>CHERRY RED, followed by bad happenings if held on the ground
>too long .

I mentioned this before, but when my work buddies and I built one, we used scrap and flow/damaged shuttle tile scrap for insulation.

Several members of Space Coast Aero Modelers in Titusville, FL used to fly them at the High School on Saturdays but housing encroachment has pretty much shut it down. They used a SCUBA tank and probe instead of a hand pump for real easy starts. Wonderful to hear that noise!! When I attended Cal Poly in the late '60's, we had a test cell with a Marquardt pulse jet, about the same size as the V1 engine and used to run it at night. We could see the standing wave pattern inside the tube from the bands of red glowing through it. Now that's some serious loud!! You didn't "hear" it, you felt the low fequency combustion pattern rumble your entire body. If the marine layer was just right, we could resonate the blast off the fog and break windows in the Ornamental Horticulture greenhouse 1/2 mile away. By accident, of course. During our annual campus open-house, we would wait until the nearby rodeo was in full swing and "demonstrate" it with a short run. Boy, those cowboys would get riled up easy!! We lit that beast with crumpled newspaper stuck up the tailpipe and got the air supply from a surplus jet engine starter rig (used a Chrysler hemi to run the pump). Ran Avgas in it and the professors got as much enjoyment out of it as we students did. Finally overheated the tube and it buckled. I believe it last ran about '72. Nowadays, they don't let you walk in the cell without Safety present. A fellow can't have any fun anymore.

Speaking of sound, I saw a static firing of a Shuttle solid booster motor in Utah some time back and the shock waves could be seen bouncing off the sloping hillside behind the nozzle and into the sky. That was nice, but the Marquardt was FUN!

Rollin Keszler

The speed guys glide them for a couple of laps after they shut down to let the pipe cool a little before the bumps of landing.

I read a neat pocket book, "The 81st Site" about an undocumented V1 site tracked down after WWII by an unreconstucted Nazi who sets out to atom bomb London. Highly reommended.

LAST EDITED ON Jun-06-04 AT 03:34 AM (CDT)
 
Na, i started my 1st german jet by myself back in 1967 on 115/145 av gas at stutgart airport with an air compressor,also providing the inital spark.
Still have, along with Ralphs U2 plans that i never got to build.
Some day....
Speeking of old days, have a all metal f84 kit from japan.
Roger

My boat club friend, chuck bergman flew them in speed. noway i could have kept up with him round the circle, and he was bigger than me!.
Roger

The "startup by Torben Kristiansen" on the site Elmore listed (msg #15) is the most typical, at least as far as my experience with the things. My brother and I started one up by ourselves (bicycle pump and Model "T" coil), sounded just like that--little explosions followed finally by one big sustained one. It didn't quite get away from us, but We did set the field on fire. You definitely need more than 2 people.
--Ray

To see what Jet Speed looks like today have a look at

http://members.cox.net/muaero/

Even with the large diameter lines (0.033") and a fuel mixture blended in part to keep the speeds down (80% methanol, 20% Propylene Oxide), they are hitting 200 mph.

They are a ball to fly!