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General control line discussion => Open Forum => Topic started by: frank mccune on September 03, 2017, 08:35:32 AM
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Hi All:
On E Bay a ST G.19 .19 is being offered. Did this ever exist or is a G 15 modified to be a .19? The case stamping is ground off and 1.9 in in place where it should say 2.5. I do not recall any .19 engine made on a G15 case. This may be a very rare ST or ?
Any ST historians out there?
TIA,
Frank McCune
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Yes it did exist. My flying partner had one. If I remember correctly, it had a baffled piston. The 15 did not have the baffled piston.
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You would think it would be called a G15-19, in line with G21-35/G21-46 and G20-15/19/23
G15 for the case style, and 19 for the displacement
But Supertigre's G nomenclature was always a bit of a mystery :)
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they made a flat top piston 19 in the 15 case, I know one guy that would drop one in a goodyear back in the 52 ft lines days
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Hi Bob:
I want you to think very carefully about the case that your friend had. The G 15 case had the offset venturi that was rectangular in shape on all but the first model. The G20 case had the round venturi with a bit if offset and it was made in .15,.19 and .23 displacements. I think that only the .15 had a non baffled piston in the G 20. The other two had baffles.
I think that if the one on E Bay is original, it must be very rare.
I am anxiously awaiting your reply as I am always fond of learning something new.
Be well,
Frank McCune
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Link to the ebay sale:
http://www.ebay.com/itm/RARE-NEW-SUPER-TIGRE-G-19-G-19-C-L-CONTROL-LINE-RACING-MODEL-AIRPLANE-ENGINE-/401394857937?hash=item5d74ff77d1:g:XWYAAOSwfcBZjzca
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Hello to Bob et al:
I researched this engine and by Golly it was produced! I did learn something new today.
I am curious to see what its performance figures were. I imagine that the 1972 Rossi .15 made it obsolete.
All of he best,
Frank McCune
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Hello to Bob et al:
I researched this engine and by Golly it was produced! I did learn something new today.
I am curious to see what its performance figures were. I imagine that the 1972 Rossi .15 made it obsolete.
All of he best,
Frank McCune
Frank,
The seller says it's a flat top piston, scheneural (sp?) ported racing engine.
Jerry
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It has all the earmarks of an engine built for speed events...big intake, dual ball bearing, cooling fins on only the exhaust side of the head, integral spinner, etc. IIRC Class A speed in the US allowed engines up to .19CI (maybe it was .20) prior to the decision to parallel with FAI using .15s. I remember, for instance, that McCoy had a .19 rear intake equivalent of the Class B .29 and Class C .60 Red Head engines intended to fill all three AMA classes.
Could this have been a contemporaneous production by ST???
Ted
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Frank,
The seller says it's a flat top piston, scheneural (sp?) ported racing engine.
Jerry
More likely its the ST "Air Foil " porting, that was a ripoff of Dr Schnurle's porting design, as was the Combat 35 and G-21 35
Randy
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I have 2 of these engines and were called G20/19 if you want to go by the sticker on the ST box :). The intakes look rectangular on the outside but are bored round to accept an RC carb if necessary. Pistons are flat topped for the ST style porting. However there are two types of these 15/19's, one has twin ball races and a 5mm prop nut thread while the second has a single rear ball race and bushed front end with a 1/4" thread to accept the standard type flywheel for car use (apparently the front of the casting is too small to fit a 1/4"ball race). The one on ebay will certainly be the twin ball race version seeing it has the integral spinner.
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(https://i.pinimg.com/564x/cb/4c/39/cb4c39b0bcdf79ffe972dc2181dfb819.jpg)
S?P S?P Seems a ' 19 ' Super Tigres been around for some time , tho ' Number ' dosnt necesarilly match displacement .
(https://thumbs.worthpoint.com/zoom/images1/1/0211/27/super-tigre-x21-19-speed-nib_1_704dff5cf573417c41d1d082a4bf485d.jpg)
Even an X-15/19 !
Think the FINNED Head 20/19 & 20/23 are the baffled sods , whereas the unfinned head 20/15 & 20/19 are the ST porting Flat Top Piston .
The 15/19 FI ( with the offset Square Intake ( F. I. = Front Intake whereas R.V. = Rear Venturie ?? )) was listed in there 1965 brochure .
Plain Grey intake . The Muffler Lug - Round Alloy Intake ( same part as 21/35 B. B. they all love for Combat ) is the Seventies Version & accepts the .46 style Carburator ( R/C ) .
Some Italian had things like 20/19 Diesels & G 15/19 RVD & RVG , on ' the bay ' around a year ago .
Must have been many experimental & short run lots from Super Tigre , like the nebulous G-15-F.I. Diesel of 1975 . Maybe a dozen built . Who Knows .
( Someone who shall remain nameless , for the moment , has a pair of the 19 single ball race & 23s in the clasifieds . If you can decipher it :-X. Basically One plus spares for each , 19 & 23 .)
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Getting a bit off track , around 75 was when things started getting a bit wierd(er ) with the predominance of R/C , the emergence of Rossi ( Who were Original Super Tigre Engineers )
and other competitive ?? in the .15 speed class manufacturers . AND the Team Race Field .
This is one of the early production X 15 RVs , on a development of a G15 FI // X 15 FI case . Still has the intake stub on the Right Hand Side .
(https://thumbs.worthpoint.com/zoom/images3/1/0416/15/vintage-super-tigre-15-rv-speed_1_af606db198f0aaefdd31098001b372a7.jpg)
With a truncated block for machineing the rear exhaust ports .PERHAPS . :P
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TRAP for Weary Players . . . the X-15 case ( and X 15/19 VD~) is the " 1744 " case , used on the LAST G15 F.I. s !
A G 15 FI ( late ) has the long split exhaust port , where a Actual X 15 has a single rectangular Ex Port .
(http://i.ebayimg.com/00/s/OTc0WDEwNDU=/z/23cAAOSwqfNXkD5v/$_1.JPG)
the G15/19 FI is I think 16 x 16 , whereas the G15 FI is 15 x 14 . bore & stroke .
If checking bullshit on Super Tigres cross check carefully , someones gonna be disapointed there ' Italian ' supplied :( 21/49 ( Ebay ) has had the carb cinch bolt (damadge ) machined off .
or is it really a Stunt Modded cross drilled short case intake THING . Wishfull thinking Id think . >:( H^^
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Some of the 15/19 FI's have the " 19 " stamped on the lug , rather than trying to stove the bypass in with the number stamp .
(https://i.pinimg.com/736x/1c/c5/81/1cc58194d57d6ca17dea6d4d8e66db95--model-airplanes-engine.jpg)
The First few years appeared as below , ive not seen the other intermediate G 15 cases IN the 15/19 .Which dont mean there arnt a few . Mayve in the X case .
(http://sceptreflight.net/Model%20Engine%20Tests/Super%20Tigre%20G15%20%20page1.jpg)
Was the highest output per dispalement in the know universe ( I.C.E. ) for some time . for a ' production ' version anyway . Wisnewski was likely up on that , after a time.