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 21 
 on: Today at 01:19:48 AM 
Started by Jared Hays - Last post by Randy Cuberly
I had a Bull Ring ST 46 in a Stilletto about 1986 or 87 I had a lot of trouble getting it to run at a reasonable speed and finally started modifying 13-5 wide blade props to about 12.25 4.25.  They ran at about 9700 RPM at launch and didn't unload much in the air.
The engine ran in a very fast 4 stroke for the entire pattern and never broke into a two stroke.  I used 15% Nitro and 22% Castor oil.  It was a good combination and flew very well.  Making the props was a real pain in the "you know what".  Getting them consistently the same was a lot of work, and being wood props and fairly thin after rework they were fairly fragile.  I finally shoe horned a ST60 in the airplane never looked back.

With the variety of props available today however I would start with an 11.25-4.25 three blade at about 9600 RPM launch, and work from there.  It would likely work into a good combination.  It is basically a very strong engine.

Randy Cuberly

 22 
 on: Today at 12:48:34 AM 
Started by Walter Hicks - Last post by John Leidle
 Walter , if that Double Star .54 is taking up too much room bring it to Salem in Oct..
  John

 23 
 on: Today at 12:40:09 AM 
Started by Jared Hays - Last post by Jared Hays
13 x 5 is whats on it now and has been for years we just have not flown it much.  But with the onset of N30 classes we are digging some old stuff out of the depths of the hanger.  It seems to work fine as long as the RPM is up but just mulling over the options and it does seem to have more power than a standard 46 and burns fuel much quicker too.

 24 
 on: Today at 12:36:38 AM 
Started by Jared Hays - Last post by John Leidle
 Stronger than I thought. Bill W. used one in Tucson ... deep 4stroke sound lotsa power.
  John

 25 
 on: Today at 12:33:29 AM 
Started by Jared Hays - Last post by Brett Buck
  I wouldn't try a 13-5 prop on that engine,,, I'd try an 11-6 or so to start,, 13 - 5 ? No way.

  I ran mine on a 13-5 Rev-Up with decent results. You can do that with a regular ST46, too, if you have a really good one.

    Brett

 26 
 on: Today at 12:32:28 AM 
Started by Jared Hays - Last post by Brett Buck
My dad and I have a Bull Ring Tigre 46 we are getting back up in the air and looking for some advice.  We have always had to run this engine a touch on the lean side, or maybe not lean but a lot higher RPM than a standard Tigre 46.  Consequently we have to go down on the pitch of the prop to slow the airspeed down to be able to do the pattern at a more reasonable speed.  We turn our other standard Tigre 46's anywhere from 7100-8100RPM depending on the plane and prop.  Usually a 12 x 6 prop.  This engine will almost not fly the plane at those RPM's.  It acts like a Fox 35 with the burp when running slow and it doesn't want to 4 cycle at all.  We are turning this motor 9100-9500 RPM on a 13 x 5 Zinger prop. Curious if we should look into a 3 bladed prop.  We are just experimenting with ideas here and not sure if I even really have a question haha but maybe if someone has more experience with this motor or higher revving motors could let me know what has worked well for them.  This motor is on a blown up original Stiletto design 59" wingspan.  Dave Trible if your out there would one of those 3 blade props you were telling me about be a good fit for this motor?

  I had one but it had, unfortunately, been modified to run at low RPM.

    Sounds like you are on the right track with the pitch. I would suggest a 12-4 and maybe 10000 rpm. You want it spinning just enough off of peak to still gain power in the maneuvers at a reasonable level flight speed, at least to start with. As you gain experience and get a workable baseline setup, then you can considered more pitch and a smaller venturi.

     Brett
    

 27 
 on: Today at 12:32:17 AM 
Started by Jared Hays - Last post by John Leidle
  I wouldn't try a 13-5 prop on that engine,,, I'd try an 11-6 or so to start,, 13 - 5 ? No way.
  John

 28 
 on: Today at 12:30:39 AM 
Started by Sean McEntee - Last post by peabody
Sean....Thanks for your service....
It's not a bad choice.......
Have fun!
Peabody

 29 
 on: Today at 12:18:56 AM 
Started by Jared Hays - Last post by Jared Hays
pics of motor.




 30 
 on: Today at 12:09:21 AM 
Started by Jared Hays - Last post by Jared Hays
My dad and I have a Bull Ring Tigre 46 we are getting back up in the air and looking for some advice.  We have always had to run this engine a touch on the lean side, or maybe not lean but a lot higher RPM than a standard Tigre 46.  Consequently we have to go down on the pitch of the prop to slow the airspeed down to be able to do the pattern at a more reasonable speed.  We turn our other standard Tigre 46's anywhere from 7100-8100RPM depending on the plane and prop.  Usually a 12 x 6 prop.  This engine will almost not fly the plane at those RPM's.  It acts like a Fox 35 with the burp when running slow and it doesn't want to 4 cycle at all.  We are turning this motor 9100-9500 RPM on a 13 x 5 Zinger prop. Curious if we should look into a 3 bladed prop.  We are just experimenting with ideas here and not sure if I even really have a question haha but maybe if someone has more experience with this motor or higher revving motors could let me know what has worked well for them.  This motor is on a blown up original Stiletto design 59" wingspan.  Dave Trible if your out there would one of those 3 blade props you were telling me about be a good fit for this motor?

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