26:
105:
119:
The two-piece crankshaft, with counter-weights, is carefully forged from heat-treated chrome-vanadium alloy steel and drilled for lightness and lubricating oil flow. Master and slave connecting rods are forged and machined from the same material as the crank-shaft. The rear of the crankshaft carries
112:
The Comet radial was fairly standard with steel finned cylinders, cast light alloy cylinder heads and two valves per head. The valves are operated by a single rocker arms and push-rods, to the rear of the cylinder, which are in turn operated positively by inner and outer cam tracks operating rollers
97:
First produced by the
Aircraft Engine Corporation of Oakland, California, new interests acquired the California company and the Comet Engine Corporation was formed under the sponsorship of Air Investors Inc., the Crocker First Company of San Francisco and the Gisholt Machine Company.
93:
Comet designed the 7-cylinder radial series to take advantage of the boom in private aviation in the late 1920s; intending to replace the large number of relatively unreliable wartime surplus engines that flooded the market in the early 1920s.
123:
The two-piece crankcase is split in the plane of the cylinder centres, with the forward half supporting the fwd crank /prop-shaft bearing and the rear half housing the rear bearing, induction rotor, cam drives and accessories.
279:
180:
82:
61:
345:
250:
262:
256:
542:
204:
25:
291:
285:
186:
153:
From 1929 with
Approved Type Certificate No.47, delivering 165 hp (123 kW) from the same 612 cu in (10.0 L).
537:
147:
After improvements rated at 150 hp (112 kW) at 1,800 rpm (maximum continuous) from 612 cu in (10.0 L).
101:
Production transferred to workshops adjacent to the
Gisholt Machine Company in Madison, which acted as production supervisor.
431:
174:
116:
Oil pumps and magnetos are driven by the camshaft drives as well as the
Heywood air starter and tachometer.
141:
From 1928 with
Approved Type Certificate No.9, rated initially at 130 hp (97 kW) at 1,800 rpm.
120:
an induction rotor to ensure even mixture distribution to the cylinders from the
Stromberg carburettor.
513:
321:
315:
232:
520:. Vol. 15, no. 3. New York City: Aeronautical Digest Publishing Corp. p. 158.
169:
8:
400:
268:
333:
198:
391:
244:
238:
226:
220:
339:
297:
209:
33:
A Comet 7-E on display at the Hiller
Aviation Museum, San Carlos, California.
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382:
214:
108:
A Comet 7-E on display at the Hiller
Aviation Museum, San Carlos, California.
51:
351:
303:
192:
104:
409:
327:
309:
81:
were a family of air-cooled radial engines, designed and built by the
487:
414:
395 lb (179.2 kg) without exhaust manifold or propeller hub
273:
461:
342:
conversion to 7-RA, 7-D and 7-E by O W Timm
Aircraft Co.
366:
Aero Digest
September 1929: The new Comet radial engine
165:
Aerofiles : Aircraft of North America 1903-2003
529:
511:
453:
462:"P o w e r p l a n t s Reciprocating Engines"
427:130–150 hp (97–112 kW) at 1,800 rpm
358:
378:7-cylinder air-cooled radial piston engine
369:
543:Aircraft air-cooled radial piston engines
442:0.025 lb/hp/h (0.0042 kg/kW/ks)
88:
479:
348:, Triton Aircraft Co, Sausalito CA. 7-E
103:
85:at Madison, Wisconsin from around 1927.
512:Horsefall, J.E., ed. (September 1929).
485:
459:
436:0.55 lb/hp/h (0.093 kg/kW/ks)
253:Marine Aircraft Co, Sausalito CA. - 7-E
530:
488:"Aircraft of North America 1903-2003"
505:
13:
280:Schroeder-Wentworth 1929 monoplane
14:
554:
405:612 cu in (10.0 L)
183:7-RA and some re-engined with 7-E
486:Eckland, K.O. (3 October 2008).
460:Eckland, K.O. (3 October 2008).
24:
157:
418:
175:Alexander Eaglerock Bullet C-4
1:
538:1920s aircraft piston engines
514:"The new Comet radial engine"
446:
7:
127:
10:
559:
177:(7-E option not installed)
432:Specific fuel consumption
396:5.5 in (140 mm)
387:4.5 in (114 mm)
181:Alexander Eaglerock A-12
32:
23:
18:
359:Specifications (variant)
233:General Aristocrat 102-D
83:Comet Engine Corporation
79:Comet 7-cylinder radials
62:Comet Engine Corporation
19:Comet 7-cylinder radial
370:General characteristics
109:
89:Design and development
322:Timm K-100 Collegiate
316:Timm C-165 Collegiate
107:
245:Kreider-Reisner C-4B
170:Adcox Student Prince
346:Triton Water Sprite
269:Neilson Golden Bear
251:Marine Water Sprite
239:Kreider-Reisner C-4
223:(aka KR-34B-1) 7-RA
334:Towle WC Amphibion
263:Maximum Safety M-3
257:Maximum Safety M-2
199:Bird Wing Imperial
110:
215:Curtiss Robin J-1
113:on the pushrod.
75:
74:
550:
522:
521:
509:
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483:
477:
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457:
440:Oil consumption:
227:Fairchild KR-34C
221:Fairchild KR-34B
205:Briggs Briggster
48:
28:
16:
15:
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160:
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91:
47:National origin
46:
12:
11:
5:
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349:
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340:Travel Air 4-U
337:
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298:Spartan C3-166
295:
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41:Radial engine
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9:
6:
4:
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2:
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508:
493:
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467:
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425:Power output:
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235:proposed 7-RA
234:
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58:Manufacturer
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52:United States
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37:
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27:
22:
17:
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495:. Retrieved
491:
481:
469:. Retrieved
465:
455:
439:
430:
424:
408:
401:Displacement
399:
390:
381:
375:
363:
362:
304:Stearman C3L
292:Sierra BLW-2
286:Sierra BLW-1
162:
161:
158:Applications
132:
131:
122:
118:
115:
111:
100:
96:
92:
78:
76:
518:Aero Digest
419:Performance
352:Warren CP-1
193:Bach 3-CT-6
187:Bach 3-CT-5
133:Data from:'
532:Categories
447:References
410:Dry weight
328:Towle TA-1
310:Thaden T-2
163:Data from:
68:First run
492:Aerofiles
466:Aerofiles
364:Data from
274:Parks P-2
210:Cessna AC
195:(2x 7-RA)
189:(2x 7-RA)
276:(option)
201:(option)
128:Variants
71:c. 1928
497:6 June
471:6 June
392:Stroke
376:Type:
229:(7-E)
217:(7-D)
38:Type
499:2020
473:2020
383:Bore
324:7-RA
306:7-RA
294:7-RA
288:7-RA
282:7-RA
259:7-RA
241:7-RA
138:7-RA
77:The
354:7-D
336:7-D
330:7-D
318:7-E
312:7-D
300:7-E
265:7-D
247:7-D
150:7-E
144:7-D
534::
516:.
490:.
464:.
501:.
475:.
434::
412::
403::
394::
385::
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