O.S. GT33 with Tuned Silencer

Running an O.S. GT33 on a test stand with an Evolution 26GT/GX Tuned Silencer and getting a pretty decent power boost up from 8130 RPM to 8600+ RPM. The engine will be used in a World Models P-51 Mustang G.S. for www.P51GiantScaleRacing.com racing.
Plans for the test stand will soon be published on www.RCTestStands.com

[@MasboyRC]

I love that exhaust muffler, love it

[@DonStegall]

It is a Xoar 18x8 PJA Beechwood Propeller. It was the break-in prop to approximately simulate in-air performance of an 18x10. The header was made for an Evo 26GT/GX, and required opening the bolt holes to 5mm toward the center for a 1.34" spacing. Just the pipe (tuned silencer) as it came from Horizon. Macs Products (macspro) has a DLE-30/GT-33 header now (4210/4211/4212) and it is more open with a .875" pipe. It should perform even better with a full tuned pipe. I'm getting them to find out.

[@2LoadedDice]

If you are building a speed model, the pipe would be great. For aerobatics, freestyle etc, the supplied muffler or cans would maintain your mid-range. I'm seldom at full power for any extended period of time - but in racing I'm sure it would be wide open.

[@crashalexander7232]

WOW ...WHAT SPEED DO YOU ACHIEVE WITH 18 X 10 @ 8600....MY MATH SAYS LESS THAN 80 MPH....

[@sinuemedina2550]

that engine and pipe would look nice on the new pheonix strega

[@groran]

What kind of and size prop? That's impressive for a simple exhaust change. What did you modify on the exhaust system?

[@groran]

What maker prop and size? What did you modify on the exhaust system? That's impressive for just s exhaust change, thanks

[@sumansk12]

from where I can buy this Silencer

[@DonStegall]

Unfortunately they are no longer available ... Mac Products is no longer producing products either due the the death of David McAllister www.macspro.com ... The loss of David and his tuned pipes is a great loss to the R/C community.