I should have searched first.  I found this from Randy.

Hi Jim

You can use that one in CL Stunt, with a 265 venturie and 157 spraybar, you my want to use a lower pitch prop that a ST maybe a 5 or 4.5 pitch with a 11 to 11/34 inch diameter, Sometimes a 12 x 5 would be OK, depends on what plane your pulling
I would use 23% oil fuel with 1/2 castor, start with 5% nitro and go from there.


Randy

Leads me to a further question - motor run.   4-2 4 or steady?

Hurumph .

Theres many a ' H ' O.S. , Single & dual ball race , Iron & Al. ringed . Even abc Gardner etc . 35's . But theyre ' S ' or R. C . .

The little skiny prop driver series are single ball race . the groovey prop driver are Dual .
Theres 35C , later 35 R.C. ( Single ) 40S & 40 RC early ( with RC staped at the 40 ) then a dual ball race P & R R . early maybe iron , later Al ringed .
LATE 40 RC dont have RC onem . JUST " 40 " moulded protruding . not stamped . So if its just 40 on the bypass its the ' new ' bore & stroke . & ringed .

These Suckers would run hard out from new . Leading OS to put brass bushes in the piston on some ( & bigger ) . But a proper run in , looks after THAT .

THEREFORE a prudent type would inspect & clean the wrist pin & lands in the piston . perhaps . on a ringed OS .

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As modern oil qualitys better . 20 % should be o.k. . But 2 : 1  methanol castor for break in . maybe 3 : 1 for a while after .perhaps . Depends on cooling & weather .

overproping it would overheat it . ( see gudgeon pin / wrist pin . or read OS tests on sceptre flight . )

18.4 stroke . late ( 1974 on )

below . Stamped . 35 blah or 40 blah . 19.5 stroke 40 . or sames as 35S onda .35 . But Liners bigger O.D. , mate . SITS IN , like zorst side illustration. hanging out, here .

Dat der early dual ball race , stamped , 19.5 stroke . told by Prop Driver type .


Foitha , the late RC came with the 703 strap on lug muffler , whereas all the oilier ones , come drilled for Jetstream multi part ones .

So THIS could be a 35C, 35 RC , 40 'S' or 40 RC . if you lookathe stamped boss on the bypass , that there should tell yer . thereabouts .

They can be a swine to get the wrist pin out , same set up as a .46 Super Tigre . Left sleeve till gudgeons just exposed , withdraw rearward . Close the door & window , so the neigbours dont suffer .

Theres also a H 29 R speed motor . Dual Ball Race . Iron Piston . Max 30 S / RC inside , from the rod up . Incidently the 35 are qwedge . the Hemi 35S/RC head is a straight fit .

Oil . SEE HOW HOT IT GETS . add more if unhappy . least 50 % C . Or Castor 20 syn 3 . for a cooler country .  Qld. 25 % castor .

I am sure that this one is well run in.