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Engine basics => Engine set up tips => Topic started by: Manuel Cortes on October 15, 2006, 06:22:40 AM

Title: Super Tigre G21 46 questions.
Post by: Manuel Cortes on October 15, 2006, 06:22:40 AM
Hello all.
Iīm at tis time restoring two G21 46, and I want to change bearings. Do anyone knows the reference for ST 46 bearings? (Latest production models, with muffler mounts.
Another question, Iīm planning to use one of them in a 53 Oz 640 Sq in model.
What prop and gorund rpm would you recommend as a good starting point for this combo??
As allways, thanks very much for your help.
Regards.
Title: Re: Super Tigre G21 46 questions.
Post by: Bill Little on October 15, 2006, 08:12:52 AM
Hi Maunel,

Boca Bearings has a product number, but I do not have it handy.  I do not know of different bearings for the different series, I *think* the bearings did not change.

If you are using a "stock" style, sprinkler venturi, I go with a .181 hole.  Also, 10%nitro, 22% oil, 1/2 and 1/2 fuel.  Props can range from 11 1/2" to 12" and 5 -6 pitch.  I have some AHM props that are 11 1/2-6 1/2 that work real well, but they are no longer available.  6 1/2 pitch is not out of the question.  I do not know launch rpm, it is just na "cackle" on the ground.

53 oz. is a piece of cake for a ST 46!

Bill <><

Title: Re: Super Tigre G21 46 questions.
Post by: Manuel Cortes on October 15, 2006, 08:19:35 AM
Thanks Bill, very useful info.
Will probably try with 12-6 cut to 11 1/2 dia.... as a starting point.
Donīt know really if a good stock Tigre 46 could cope with more than 55 oz without losening that lovable 4-2-4.....
Regards and happy flights.
Manuel.
Title: Re: Super Tigre G21 46 questions.
Post by: wmiii on October 16, 2006, 07:38:24 AM
 I had a 60oz magnum, the ST46 did just fine, like you said lovely 4-2-4
run.

 Walter
Title: Re: Super Tigre G21 46 questions.
Post by: Bill Little on October 16, 2006, 07:58:56 AM
Quote from: Manuel Cortes on October 15, 2006, 08:19:35 AM
Thanks Bill, very useful info.
Will probably try with 12-6 cut to 11 1/2 dia.... as a starting point.
Donīt know really if a good stock Tigre 46 could cope with more than 55 oz without losening that lovable 4-2-4.....
Regards and happy flights.
Manuel.

Hi Manuel,

The ST 46 is one of my all time favorite engines!  It is a sweet stunt engine.  y1
I have seen them work well in planes up to ~60 oz. like Walter said, but they tend to get suspicious in poor conditions, but they do the job!  It's the 4-2 break that does it.  Even though it will not kick out the power of the "newer" engines, it has a very intelligent run.  ;D

Bill <><