Popular Science Monthly 



A Sled Driven by a Motorcycle 

 Engine and Airplane Propeller 



ANY one who possesses a motorcycle or 

 Ir\ has access to a motorcycle engine, 

 can make use 



Details of the sled runner, top and frame 

 that supports the shaft and propeller 



Top of 

 sled 



L 



of it to good 

 advantage for 

 the winter 

 months by 

 u s i n p its 

 power to 

 drive a sled. 

 While the 

 power may 

 be applied to 

 the driving 

 wheel that 

 has spikes for 

 pushing the 

 sled, it may 

 also be used 

 to drive a 

 propeller, 

 similar to 

 that of an 

 airplane, 

 which thrusts the 

 sled forward with 

 air pressure. The 

 illustration shows 

 such a power sled. 



While the plans 

 give only general 

 dimensions, they 

 are suggestive of an 

 arrangement to 

 hold the engine and 

 its connections to 

 the propeller shaft. 

 The size of the en- 

 gine and the sled 

 will determine the 

 size and height of 

 the standards. 



In constructing 

 the sled shown, the 

 power plant was 

 fastened to the rear 

 end of the frame, 

 which is about 9 

 ft. long and 3 ft. 

 wide, constructed 



of boards about 6 in. wide and II/2 in. 

 thick at the edges; and cross braced with 

 boards 1 in. thick. The runners of the 

 sleds are 4 ft. long. — Geo. M. Fox. 



288 



Qualities of Steel and Wrought 

 Iron for Plumbing 



STEEL and iron pipes corrode, but 

 tests show that steel pipes corrode far 

 more quickly 



Reae view Side view 



An airplane propeller driven by a gasoline 

 engine is the new motive power for this sled 



is greater for 

 wrought iron, 

 cates that the 

 more quickly.- 



than those 

 made of 

 wrought iron. 

 The metal 

 used to make 

 steel pipes is 

 a low carbon 

 steel, which 

 resembles 

 wrought iron 

 in softness, 

 except that it 

 has more ten- 

 sile strength 

 and is purer 

 in quality. 

 It is the lat- 

 ^ ter charac- 

 teristic which 

 makes it cor- 

 rode more 

 quickly than 

 wrought iron. 

 Wrought iron con- 

 tains slag, which ^s 

 a glassy product. 

 This delays the 

 corrosion to some 

 extent. Wrought 

 iron pipes have 

 lasted more than 

 twenty-five years, 

 if properly pro- 

 tected from frost, 

 while the steel ones 

 corrode very quick- 

 ly by the action of 

 the chemicals con- 

 tained in ordinary 

 hydrant v.ater. 



Acid and alkali 



tests show that 



steel pipes corrode 



more quickly in 



salt water than iron 



pipes. In fresh 



water, the corrosion 



the steel pipe than the 



An acid test also indi- 



steel pipe is eaten away 



-W. S. Staxdiford. 



