Today's tidbits

Moderator: Mike Everman

Post Reply
Mark
Posts: 10752
Joined: Sat Oct 11, 2003 10:14 pm

Today's tidbits

Post by Mark » Fri Feb 04, 2005 2:23 am

Old stuff from ~1947 commanding high price. Note the position of the spark plug.
http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 10198&rd=1
Square flare for square pulsejet?
http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... otohosting
And how does this baby work exactly? I wouldn't mind having one. And does some company make a kind of press fitter, something whereupon you could constrict a pipe with even force?
http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 36356&rd=1
Mark

larry cottrill
Posts: 4140
Joined: Sun Oct 05, 2003 1:17 am
Antipspambot question: 0
Location: Mingo, Iowa USA
Contact:

Re: Today's tidbits

Post by larry cottrill » Fri Feb 04, 2005 2:40 am

I think the first Dynajet to be really "mass marketed" was the one with the rear plug; by this time, I think they'd gotten down to ten petal valves and never changed it afterward. I believe the aft-located plug either eroded or cracked badly - some story like that. I wonder what the change in plug location did for[to?] ease of starting.

Maybe Dynajet Jerry will fill us in on the real story of the rear-plug Dynajet.

L Cottrill

James D
Posts: 86
Joined: Sun Jan 16, 2005 9:14 pm
Antipspambot question: 0
Location: England

Re: Today's tidbits

Post by James D » Fri Feb 04, 2005 5:31 pm

Another pulse jet (Dynajet?) on ebay UK, looks mint.

http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... eName=WDVW
Image

Mark
Posts: 10752
Joined: Sat Oct 11, 2003 10:14 pm

Re: Today's tidbits

Post by Mark » Fri Feb 04, 2005 6:56 pm

It's a Bailey Pulsejet, I have one. You can interchange the parts with a Dynajet, same threadings on the fittings and head. Same reed too. The Dynajet is a red head. The body is a little different but only if you look very closely. The metering jets on the Bailey use a lot of little holes whereas the Dynajet just has two.
Mark

Mark
Posts: 10752
Joined: Sat Oct 11, 2003 10:14 pm

Re: Today's tidbits

Post by Mark » Sat Feb 05, 2005 10:27 am

Here's what a Dynajet looks like James. I wonder how this fellow came across so many Dynajets? He's been selling them on eBay for a very long time.
Mark
http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... otohosting

Mike Everman
Posts: 4930
Joined: Fri Oct 31, 2003 7:25 am
Antipspambot question: 0
Location: santa barbara, CA
Contact:

Re: Today's tidbits

Post by Mike Everman » Sat Feb 05, 2005 3:27 pm

those are so purdy. $9.50 for petal valves, though!
Mike
__________________________
Follow my technical science blog at: http://mikeeverman.com/
Get alerts for the above on twitter at: http://twitter.com/mikeeverman

James D
Posts: 86
Joined: Sun Jan 16, 2005 9:14 pm
Antipspambot question: 0
Location: England

Re: Today's tidbits

Post by James D » Sat Feb 05, 2005 3:32 pm

The bailey sold for £205 ($385), seems like quite alot.

How long do the petals last in those things?
Image

Mark
Posts: 10752
Joined: Sat Oct 11, 2003 10:14 pm

Re: Today's tidbits

Post by Mark » Sat Feb 05, 2005 4:12 pm

You can have the Blue Bailey delivered to your door new for $200 in the US. I can't say how long the petals last but you get a spare set with the purchase and replacement petals from Earl Bailey are only $4.00 if I recall. That will buy you plenty of noise, more than you will probably find time for in a year. The welding job on the Bailey Jet is far smoother than the Dynajet. Each look nice to me though.
Mark

Mark
Posts: 10752
Joined: Sat Oct 11, 2003 10:14 pm

Re: Today's tidbits

Post by Mark » Sat Feb 05, 2005 4:22 pm

I wouldn't mind making a multi-colored anodized head and adding some variations on the theme. I could call it the Thixis Jet. My jet would come with a free long lasting jam jar. That would push those undecided buyers over the edge.
Mark

James D
Posts: 86
Joined: Sun Jan 16, 2005 9:14 pm
Antipspambot question: 0
Location: England

Re: Today's tidbits

Post by James D » Sat Feb 05, 2005 7:54 pm

You'd make a fortune, Just get the right colour and a good sales pitch
;>)
Image

James D
Posts: 86
Joined: Sun Jan 16, 2005 9:14 pm
Antipspambot question: 0
Location: England

Re: Today's tidbits

Post by James D » Sat Feb 05, 2005 8:12 pm

I wonder what that spark ignitor on the dyna jet ebay lot that mark posted is off?
http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... otohosting

It looks very similar to this one.
http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... :X:ON:UK:2

I'd love to know what they retail for, and where?
Image

Mark
Posts: 10752
Joined: Sat Oct 11, 2003 10:14 pm

Re: Today's tidbits

Post by Mark » Sat Feb 05, 2005 9:23 pm

Wow, did someone pay that much for one of those ignitors? They are just gas grill ignitors that use a single small 1.5 volt battery. Perhaps this one is the same design. They are not very hot sparks, you don't need a hot spark to light propane in a gass grill, which is what they are used for.
http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... otohosting

Mark
Posts: 10752
Joined: Sat Oct 11, 2003 10:14 pm

Re: Today's tidbits

Post by Mark » Sat Feb 05, 2005 9:28 pm

Here's a reliable spark plug to go with the expensive igniter. Probably made of stainless steel and lots of love and aircraft regulatory mandates. Check the retail price.
http://cgi.ebay.com/ebaymotors/ws/eBayI ... gory=26439
Mark

Mark
Posts: 10752
Joined: Sat Oct 11, 2003 10:14 pm

Re: Today's tidbits

Post by Mark » Sat Feb 05, 2005 10:04 pm

Not that I have a use for this, but it somehow reminded me of a Dynajet head. You never know where some old piece of machinery will be found that could be used in pulsejet land.
Mark
http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... otohosting

Mark
Posts: 10752
Joined: Sat Oct 11, 2003 10:14 pm

Re: Today's tidbits

Post by Mark » Sun Feb 06, 2005 3:02 pm

Often times I think people are put off by jam jars because they seem, for lack of a better phrase -- cosmopolitan nonsense. Rural people might feel lost in the big city, navigating the streets of cadency, feedback, and resonance, let alone that Franco Marcenaro part of town where a simple wave can lead to a sex change.
We all know country folk might be able to bring something to the table, after all, working with jam jars is natural to them and they know just how important it is to get a good sealing lid. If we told them how jam jars work, how you could color the flame, I think they could handle it.
Mark
http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... otohosting

Post Reply