For what it is worth, here is a tabulation of some engine data I have collected from various vendors for weight, thrust, fuel/oil ratios etc. It might help you when trying to compare engines. Hopefully the columns will line up so as to be readable.

Engine Displacement HP@RPM Thrust-LB Weight Fuel/Oil Prop
DLE 20RA 20.5cc 2.5 @ 9000 13.9 1.92 lb 30:1 14x10, 15x8. 16x6, 17x6, 18x6
DLE 30 30.5cc 3.7 @8500 18.7 2.41 lb 30:1 18x6, 18x10, 19x8, 17x6,20x8
DLE 35RA 34.9cc 4.1 @8500 19.8 2.55 lb 30:1 18x10, 19x8, 20x8, 20x10
DLE 40T 40cc Twin 4.8 @ 8500 20.9 3.30 Lb 30:1 19x8, 19x10, 20x8, 20x10
DLE 55RA 55.6cc 5.5 @ 8500 31.9 3.86 lb 30:1 22x8 ; 22x10 ; 23x8 ; 23x10
DLE 60T 61cc 7.0 @ 8500 33.5 4.49 Lb 30:1 22x10. 23X8, 23x10, 24x8
DLE 120T 120.0cc 12 @ 7500 58.4 5.95 Lb 30:1 26x10, 26x12, 27x10, 28x10

OS 1.20AX Glow 1.218 ci, 3.06@ 9,000 ? 29+oz Glow 15x10-12, 16x8-10
Saito FG-11-4C 0.66 ci, 10.88cc equal to 40 glow 2C 21.9 oz 20:01 12x8 - 13x8
Saito FG-30B-4C 29.1cc ? hp @ 10000 ? 38 oz 15x8 - 18x6
Saito FA-150B glow 1.5 ci 2.5 @ ? ? ?
Saito FA-180 glow 29.1cc 2.8 @ ? 33.7 oz glow 15x10. 16x8. 18x6

NGH GT17 16.91cc 2.1 @ 9200 ? 1.74 Lb 20:1 14x8, 15x8, 16x6, 16x8
NGH-GT25 25.09cc 2.7 @ 8900 ? 2.11 Lb 25:1 15x10, 16x8, 16x10
NGH-GT35 34.96cc 4.22 @ 8800 ? 3.06 Lb 35:1 18x10,19x10. 20x8

RCGF 10RE Stinger 10cc 1.9 @ 12,000 8.2 lbs 1.37 lb 30:1 13 x 6, 14 x6,13X8,13X7
RCGF 15RE Stinger 15cc 2.4 @ 9000 10.2 lbs 1.69 lb 30:1 13x6, 14x6, 13x8, 15x8, 15x6
RCGF 20RE Stinger 20cc 2.8 @ 8700 14.2 1.75 lb 30:1 14x10,15x8, 16x6, 16x8, 17x6
RCGF 20 Twin 20.5cc 2.8 @ 8600 14.1 2.02 lb 30:1 15x8, 16x8, 17x6
RCGF 26RE Stinger 26cc 3.1 @ ? 17.68 lb 2.11 lb 30:1 16X8,16X10,17X8,18X8,18X10
RCGF 30 Twin 30cc 3.7 @ 7500 17.2 lb 2.53 lb 30:1 18×8, 18×10, 19×8 & 20×8
RCGF 35RE Stinger 35cc 4.1 @ 9000 19.9 lb 2.52 lb 30:1 19x8, 20x8, 20x10
RCGF 40 twin 40cc 4.6 @ 8600 23.4 lb 2.92 lb 30:1 19x8, 19x10, 20x8, 20x10
RCGF 70 twin 70cc 7.4 @ 8600 34.2 lb 3.98 lb 30:1 22×10, 23×8, 23×10,24X8

(Valley View RC)
VVRC -20 20cc 2.85 @ 8500 ? 1.75lb 32:1 16x8, 17x6
VVRC -26 26cc, 1.6ci 2.95 @ 8800 15.9 2.07 Lb 40:1 16x8, 16x8-10, 17x8-10, 18x8-10
VVRC-RCGF-35 RE 35cc 4.1 @ 9000 19.9 2.52 Lb 30:1 19x8, 19x10, 20x8, 20x10
VVRC 30T 30cc Twin Cyl 3.7 @ 7500 ? 2.53 Lb 40:1 18x8-10, 19x8, 20x8
VVRC 40T 40.5cc Twin Cyl 4.6 @7400 ? 2.88 Lb 32:1 21x8
30:1
Zenoah G23 2.0 @ ? ? 3.19 lb 32:1 9000 rpm on 15x8
Zenoah G38 2.3 CI 2.2 @ 7,300 ? 4.25 Lb 32:1 18x10

Enya R1.20-4C 1.2 CI 2.1 @ 12500 13? 2.00 Lb Glow 13x8-9, 14x7-9, 15x6-7, 16x6

Brison 3.2 53 cc 4.5-4.8? @ 8000 26 3.75 50/80:1 20x10, 20x12, 22x8


(Super Tigre)
ST 2000/25 25cc 2.40 @ 11,000 ? 47.9 OZ Glow
ST 3000 30cc 2.96 @ 7900 ? 2.59 lb wo muff Glow 2.93 lb w/muffer 18x8, 20x6, 20x8 Performance is very similar to RCGF Stinger 26RE

Quadra 50S 50.8 cc 4.0@ 9000 5 lb 8.5 oz 18x10
Quadra Q52XL 52 cc 4.5 @ 7000 4.1 lb 20x10 for planes 18 to 25 lbs
Quadra 42 42 cc 2.4 @ 8561 w muff 4.73 lb 18x12 prop for 22 lb plane
Quadra 35 35 cc ? 18x8 for 16 to 18 lb planes