Ace of Diamonds (oz3662)


Ace of Diamonds (oz3662) by Dick Twomey 1950 - plan thumbnail

About this Plan

Ace of Diamonds. A 26in span rubber driven Lightweight.

Quote: "The aim in designing the Ace of Diamonds was to produce a rubber-driven lightweight that was differnt in appearance without if possible any loss in performance. The results have been very satisfactory, the model being capable of making a vertival climb - if such a method of ascension be your choice. It is not an ultra-lightweight and is, in fact, pretty tough.

The Ace is very versatile and the prototype has also been fitted with a Jetex 200 unit by way of variation. This change is easily effected by the removal of the rubber motor and the substitution of a glider nose-block for the propeller assembly. The Jetex unit is mounted forward over the mainplane, the centre section of which is protected by a piece of asbestos paper. This Jetex version flies very well indeed and holds the Ampleforth College MAC record for this type with a flight of 5 min 52 sec OOS. The rubber-driven version also holds a club record in the rubber category, clocking 9 min. 30 sec. before going OOS. vertically overhead.

The construction of the Ace of Diamonds is so simple that building instructions are hardly necessary. The fuselage is made in the usual way on the plan and the only point requiring special mention is that the positions of the 3/32 in square spacers should be noted, most of the spacers being 1/16 in square. The wing platform is braced with 20 swg piano wire shaped as shown on the plan.

As with any duration model, particular attention should be given to the propeller. This is carved from a balsa block 6 x 2 x 1-1/2 in, and should be left fairly thick until trimming tests have been carried out......"

Update 12/01/2016: Replaced this plan with a cleaner copy (patterned background removed) thanks to TonyP.

Supplementary file notes

Article page, text and pic. Also, previous scan version.


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Ace of Diamonds (oz3662) by Dick Twomey 1950 - model pic


Ace of Diamonds (oz3662) by Dick Twomey 1950 - pic 003.jpg
Ace of Diamonds (oz3662) by Dick Twomey 1950 - pic 004.jpg
Ace of Diamonds (oz3662) by Dick Twomey 1950 - pic 005.jpg

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User comments

Propeller dimensions not to scale ie the length
anon - 28/10/2015
Fair point, seems there was a lapse in either the scaling of, or the dimensioning of, the prop blade. That's how the plan was printed and how it appeared in the magazine. It was drawn 6in long, but the dimensions say 2-1/2 + 3 = 5-1/2. Good point.
SteveWMD - 29/10/2015
Hi Mary, Please find attached some pictures of my Ace of Diamonds [main pic, 004, 005] designed by Dick Twomey in 1950. Just need the rain to stop to give her a whirl. Regards,
Len Bridge - 26/07/2023
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  • Ace of Diamonds (oz3662)
  • Plan File Filesize: 333KB Filename: Ace_of_Diamonds_oz3662.pdf
  • Supplement Filesize: 507KB Filename: Ace_of_Diamonds_oz3662_article.pdf
  • Supplement Filesize: 1465KB Filename: Ace_of_Diamonds_oz3662_previous.pdf
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* Credit field

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