10.5x5.25 Eather three blades , as recomended for 40 FP's by Adamisin & Co. , give a deeper Four Stroke run , in a 65 ounce plane , for milder conditions . May give better ' BRAKE ' downhill ?, maybe .
Was surprised Id found another ' happy ' prop for it . BUT BIGGER & i cant see it unload into the two , with the 13 , unless youve bunged the bypass & hemi'd the head ? ( Be intresting to see a Big Jim G-51s insides )
For howling gales & 4 inch pitch , ive yet to try a G51 R.C. . The ' stunt ' sounds like the top end will shortly depart on the 10 x 4 three blade Tornado . Pre Ignition im told . Rather resonant & acoustic , I say . Anyway .
THE BOOK says 11 x 6 . Cant you read .
( the INSTUCTION MANUAL ) . a good place to start . Power is at 11.000 , so presumably it should be at 10.000 or so , in the two stroke .
RINGS : the ETA 29 ' book ' says " LAPPED " . Obviously its the RINGS that are lapped . METICULOUS CLEANING after getting grinding / lapping paste , near ANY engine is mandatory .
I start with the garden hose , hard out . ( youll get wet ) , then tip a kettle of boiling water over it . Then Acetone rinse . The Olde adage of if a white cloth marks , rubbing it , its NOT clean .
Brian Eather , again - ST .46 Rings . To Quote ( ish ) TWO DOWELS , a ledge in one to acxcept a ring , floating . fore finger and fumb on dowle ends , hold sleeve in other hand and , and go to it . Check etc .
One can obvioulsly drill & bolt the dowles . the object is a even matte " mated " finish . Used bores perhaps need ' deglazeing ' usually busted with light scratching with 600 Wt. dual 30 Deg. cross hatch recomended .
( the period toonin info related holding ring in bore up to a strong light ,to check for mateing , contricity / roundness etc . GAP fitted opposite exhaust . i.e. at boost port . But G-51's are PEGGED ? ) .
I believe Supre Tigre 46 Rings were perhaps earlier softer ? for the CHROME BORE , the ' other ' later part number HARDER , for the unchromed sleeve . This is suposition but conventional logic in this respect .
FURTHER V early ( Stamped ' AA ' on lug edge , 46s & ' V ' 51 / 56 , were pre U S World Engines ' soften em up ' directive ( seen in print ) as ten hours were thought excessive ' run in ' .
That Is , Ten Hours CAREFULL USE , and they were nearing peak performance - which with care & maintanance theyed maintain ! indefinately . From about 1970 S Tigres were ' mass production ' ,
Rather than selectively assembled by a young ROSSI , Himself .
HOWEVEr a Italian G 51 Stunt should improve , with care , so its itself at around four hours use , and will continue idefinately . Though in ten years the nitro may get at the bearings . Unreplaced the debris
might destroy the fit f the rest of it . So Bearing Replacement , could be regarded as regular maintanance , per decade , in regular use . Still - flushing & oiling afyter use & for winter storage helps .
However , if theres any lack of silky smothness rotateing sand plug , Decent Bearings will restablish its magnificance . The .46 rc muffler , tailpipe sawed off & 8 mm hole , will give a W Champs standard. run .
Your Overproped .
AND , Std, intake venturie , opening to .312 odd ( or so ) gently scraping to smooth the machined edges , makes you feel better if nothing else . Improves the run , as does a 1.5 m.m. drill - ( No 53 ? )
through the spraybar end to end and thru the feed hole. CLEAN OUT the sucker afterward . Provides more positve needle Adj. a Olde S T 46 Trick , from ' the book ' as it was written . If it were ' Stock '
see its deburred , trial assemble , seat . Strip & clean . then fit . I give em the first two hours NO NITRO . They run good on straight 20 / 80 . a gasket or two extra for 5 or 10 nitro , usually .Thats about IT .