s

Slomoshun
World Famous Hydroplanes
& the people who created them.


New
Stan Sayres Personal Journal of Propellors

System Coolant Design & development 49 to 50

Bearings & Struts

Tail Fin design &
development

Steering mechanism
design & development

Strut design & development

Note:I have had so many
requests for more information
about the true story behind the design and development of Slo-mo-shun IV that I have decided to put the information online as I am working on it.
So don't be surprised if it changes as we go along.

If you have comments or suggestions send them to

Dick Carroll

Homepage

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The Evolutionary Design
& Development of Slo-mo-shun IV

Evolution of tail
design & development

Please keep in mind that I am only discussing the external
shape of the tail here. There were many additional changes in its actual framing
and component parts. The other parts were continuously redesigned to
improve the strength, lighten the load, and facilitate the use of the trim
tab. And for the time being I have ommited them from this presentation ortherwise,
I'd have to write a book just on this one component of the Slo-mo IV.
Dick Carroll & DeWitt Jensen

Insert Teds original Sketch of tail (when scans are done)	October 1948
Insert Anchors Original Plan #1 of Tail (when scans are done)	October 1948
Insert Anchors Original Plan # 2 of Tail (when scans are done)	November 1948
	October 1949 The boat was originally launched in October 1949, without a tail. The tail simply hadn't been developed far enough or built yet. And this was a year after the start of the project.
	April 1950 In April of 1950 Slo-mo IV had a simple tail with NO trim Tab or wire supports
	June 1950 In June of 1950 she had the familiar pointed tail, with trim tab and no wire supports. This tail is hollow with internal framing and a light skin. This is the configuration used during the June 26, World Record Run, The Gold Cup, & Harmsworth race: Note that Ted leaves the Slo-mo team in Sept of 1951. But the design work continues
insert photo	Non-extended tail with wire supports
insert photo	Extension with no wire supports
	June 1952 This is the tail many people are most familiar with. It was designed by Anchor Jensen and is the configuration used to Record another successful World Record mile run.
	June 1953 This Tail was designed by Jack Harshman of Boeing in 1953. Jack did a wind tunnel test on Slo-mo IV and the Team decided to give it a try. Unfortunately it did not achieve the results of the early extended tail used in 1952. But it looks really slick on the boat.
	June 1954 So in 1954 Stan & Anchor decide to go back to Anchor's 1952 design. The only external difference is that they decided to attach the supports to the transom instead of the aft decking.