D>  a ' 15 shaft ' compared to the .46' S T  's 12 . Yer intakes the .60 / G 51 fit . ( ST 60 is also ' 15 m.m. shaft . A VF 40 / 46 is 16 m.m.  Gas Passage Bore Sizes To Suit . figure ! )



IF its THIS . and even if itsnot . The Schneurle is big letters on the case .short . big head

WHEREAS the ; loop scavenged ; 40 & 51 , - are ' three window '  P.D.P.  preceeding the last ST 60 like that .

Put a 12x4 on it . about a .200 or 180 straight thru intake , on a lighter plane . Meester Smith saying they run better thanna ST .46 !!!!!
one can shave say 3/32  maybe , off the exhaust stack , for clear screwdiver access to mt. bolts . Maybe trim a m.m. off the lug sides . if neccesary . carefuly . One then other . Measure as you go .
The bolt patterns G 51 etc match . But props closer . Are a 60s G 40 /46/51 race injun derivative . Brikhause & others used THAT .40 .
Al Rabe & Franbk McMillan 60 er ised therm . ( The Liner OD is 26 like a early .60 - 24 bore rather than 23 . Doable but woftam . ) Let Er REV . switches well . not bquite schneurle grunt .

sceptre flight Como 51 STUNT test , typer . We know knuthing . about . That being the schneurle .

First S T   ABC  rat race cetra . The DIES modified , for that there Como . Limited component interchangeability . Both are longer rod than ST 21 series . Olde  V 51 rings fit .mazing what a bit of compression does for them .  So if ' used ' strip'n'clen'n'oil . & a new ( 23 m.m. ) ring , carefully bedded in , theyve got a bit of grunt .

Some Ere , maybe . ( video ) https://stunthanger.com/smf/open-forum/frank-mcmillan'smartin-baker-mb-5/

I started one for the first time , in a Magnum Id never Flown , offical , at the state champs . set . respoectable ? flight . for a rubber control no groove inconsistant plane .
BUT It'd work real well , in , say , a 55 ounce 60 span Magnum , Hallmark , etc. etc. etc . A gruntier heavier ST .46 !  ST 46 / 60 muffler fit - is same . must drag it out .
The reringed one is docile & coming along well . DONT get too carried away shaving away the case ! ! ! .

I had a Como 51, the loop scavenged one that was running very well as stunt engine until I had someone modify it to a dykes ring, wasn't worth anything after that.

Guys, Schneurle porting and loop scavanged are the same thing and require 3 separate transfer passages. I think this engine has one big bypass so it can only be a cross flow engine even if it has the highly angled S/T transfer ports and Perry ports. The fuel doesn't loop up and over, it just splatters across the cylinder which is why most cross flows have a baffle.

MM

Guys, Schneurle porting and loop scavanged are the same thing and require 3 separate transfer passages. I think this engine has one big bypass so it can only be a cross flow engine even if it has the highly angled S/T transfer ports and Perry ports. The fuel doesn't loop up and over, it just splatters across the cylinder which is why most cross flows have a baffle.

MM

You don't need a boost port to call it a Schnuele. L

My experience is with the Como .40. I see the .51 is completly different and much improved. Still, I think the term Schnuerle is used rather loosely in some applications.

MM