Flight and Test-Stand Investigation of High-Performance Fuels in Modified Double-Row Radial Air-Cooled Engines. 3 - Knock-Limited Performance of 33-R as Compared with a Triptane Blend and 28-R in Flight
Abstract
A comparison has been made in flight of the antiknock characteristics of 33-R fuel with that of 28-R and a triptane blend. The knock-limited performance of the three fuels - 33-R, a blend of 80 percent 28-R plus 20 percent triptane (leaded to 4.5 ml TEL/gal), and 28-R - was investigated in two modified 14-cylinder double-row radial air-cooled engines. Tests were conducted on the engines as installed in the left inboard nacelle of an airplane. A carburetor-air temperature of approximately 85 deg F was maintained. The conditions covered at an engine speed of 2250 rpm were high and low blower ratios and spark advances of 25 deg and 32 deg B.T.C. For an engine speed of 1800 rpm only the high-blower condition was investigated for both 25 deg and 32 deg spark advances. For the conditions investigated the difference between the 33-R and the triptane blend was found to be slight; the performance of blend 33-R fuel, however, was slightly higher than that of the triptane blend in the lean region. The knock-limited power obtained with the 28-R fuel for the entire range of test conditions; the greatest improvement was shown in the lean region.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1945
- Accession Number
- ADA801385
Entities
People
- Calvin C. Blackman
- H. J. White
Organizations
- Glenn Research Center