Category: Engineering & Technology
§§ 1-2. Its primary importance both in rubber and power-driven models--Professor Langley's experiences. § 3. Theoretical aspect of the question. § 4. Means whereby more weight can be carried--How to obtain maximum strength with minimum weight. § 5. Heavy models versus light on...
§ 1. Some forty years have elapsed since Pénaud first used elastic (rubber) for model aeroplanes, and during that time no better substitute (in spite of innumerable experiments)...
18. CHAPTER V.With elastic or spring driven models the problem is more complicated than for models driven by petrol or some vaporized form of liquid fuel; and less reliable information is to...
27. CHAPTER XIV.Miles per hr. Feet per sec. Metres per sec. 10 = 14·7 = 4·470 15 = 22 = 6·705 20 = 29·4 = 8·940 25 = 36·7 = 11·176 30 = 44 = 13·411 35 = 51·3 = 15·646
31. Part I. Open Hearth Furnaces. 52 plates, 14 in. by 10½ in.=Gold Mining and Milling= in Western Australia, with Notes upon Telluride Treatment, Costs and Mining Practice in other Fields. By A.G. CHARLETON. 82 illus. and numerous plans a...
30. Part 2. 73 pp. (_1909_)=Dry Batteries:= how to Make and Use them. By a DRY BATTERY EXPERT. With additional notes by N.H. SCHNEIDER. 30 illus. 59 pp. crown 8vo, sewed. (S. & C. SERIES, NO. 7.) (_New Yo...
21. CHAPTER VIII.§ 1. The chief difficulty in the designing and building of model aeroplanes is to successfully combat the conflicting interests contained therein. Weight gives stability, but re...
20. CHAPTER VII.§ 1. The choice of materials for model aeroplane construction is more or less limited, if the best results are to be obtained. The lightness absolutely essential to success nece...
19. CHAPTER VI.§ 1. Passing on now to the study of an aeroplane actually in the air, there are two forces acting on it, the upward lift due to the air (i.e. to the movement of the aeroplane su...
29. Part I. 11 plates, 296 pp. (_1904_)=A Pocket Book of Useful Formulæ and Memoranda,= for Civil and Mechanical Engineers. By Sir G.L. MOLESWORTH and H.B. MOLESWORTH. With an Electrical Supplement by W.H. MOLESWORTH...
16. CHAPTER III.§ 1. It is perfectly obvious for successful flight that any model flying machine (in the absence of a pilot) must possess a high degree of automatic stability. The model must be...
13. CHAPTER XIV.§ 1. Comparative velocities. § 2. Conversions. § 3. Areas of various shaped surfaces. § 4. French and English measures. § 5. Useful data. § 6. Table of equivalent inclinations....
15. CHAPTER II.§ 1. It is, or should be, the function of an aeroplane--model or otherwise--to pass through the medium in which it travels in such a manner as to leave that medium in as motionl...
26. CHAPTER XIII.§ 1. From time to time flying competitions are arranged for model aeroplanes. Sometimes these competitions are entirely open, but more generally they are arranged by local clubs...
22. CHAPTER IX.The torque of the propeller naturally exerts a twisting or tilting effect upon the model as a whole, the effect of which is to cause it to fly in (roughly speaking) a circular c...
28. Part I. A Steel Box Girder. (_1894_)23. CHAPTER X.§ 2. It should (theoretically) be launched into the air with a velocity equal to that with which it flies. If it launch with a velocity in excess of that it becomes at once unst...
14. CHAPTER I."To give you some idea how slight a thing will make a model behave badly, I fitted a skid to protect the propeller underneath the aeroplane, and the result in retarding flight c...
24. CHAPTER XI.§ 2. The earliest flying models were helicopters. As early as 1796 Sir George Cayley constructed a perfectly successful helicopter model (see ch. iii.); it should be noticed the...
4. CHAPTER IV.§ 1. Some experiments with rubber cord. § 2. Its extension under various weights. § 3. The laws of elongation (stretching)--Permanent set. § 4. Effects of elongation on its volu...
25. CHAPTER XII.A model flying machine being a scientific invention and not a toy, every devotee to the science should make it his or her business to keep, as far as they are able, accurate and...
5. CHAPTER V.§ 1. The position of the propeller. § 2. The number of blades. § 3. Fan _versus_ propeller. § 4. The function of a propeller. § 5. The pitch. § 6. Slip. § 7. Thrust. § 8. Pitch...
8. CHAPTER VIII.§ 1. The chief difficulty to overcome. § 2. General design--The principle of continuity. § 3. Simple monoplane. § 4. Importance of soldering. § 5. Things to avoid. § 6. Aerofoil...
10. CHAPTER X.§ 1. The direction in which to launch them. § 2. The velocity--wooden aerofoils and fabric-covered aerofoils--Poynter's launching apparatus. § 3. The launching of very light mod...
6. CHAPTER VI.§ 1. The centre of pressure--Automatic stability. § 2. Oscillations. § 3. Arched surfaces and movements of the centre of pressure--Reversal. § 4. The centre of gravity and the c...
3. CHAPTER III.§ 1. automatic stability essential in a flying model. § 2. theoretical researches on this question. §§ 3-6. a brief summary of the chief conclusions arrived at--remarks on and d...
2. CHAPTER II.§ 1. The chief function of a model in the medium in which it travels. § 2. Resistance considered as load percentage. § 3. How made up. § 4. The shape of minimum resistance. § 5....
9. CHAPTER IX.§ 1. A problem of great difficulty--Effects of propeller torque. § 2. How obviated. § 3. The two-propeller solution--The reason why it is only a partial success. § 4. The _speed...
11. CHAPTER XI.§ 1. Models quite easy to make. § 2. Sir George Cayley's helicopter model. § 3. Phillips' successful power-driven model. § 4. Toy helicopters. § 5. Incorrect and correct way of...
1. CHAPTER I.§§ 1-2. Its primary importance both in rubber and power-driven models--Professor Langley's experiences. § 3. Theoretical aspect of the question. § 4. Means whereby more weight c...
7. CHAPTER VII.§ 1. The choice strictly limited. § 2. Bamboo. § 3. Ash--spruce-- whitewood--poplar. § 4. Steel. § 5. Umbrella section steel. § 6. Steel wire. § 7. Silk. § 8. Aluminium and magn...
12. CHAPTER XIII.