250 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1962 



MAN LY AND VEAL 



CONSULTING ENGINEERS 



2SO WEST S>AV< STREET 



NEW YORK 



April 27, 1926, 



Professor C, Fayette Taylor, 

 Ae r onau I i ca 1 De part jje nt , 

 Uassachusotts Institute of Teclinolo^y, 

 Canbridgo A, ISxasachusetto. 



Dear Professor Taylor:- 



I had forgotten that T had not Included In the ''emolr the more de- 

 tailed infomation ooncernins the size, weight and speed of the 

 snail Kanly Motor. 



TJnfortumtely, I cannot refer to the original records vrhich were 

 returned for safe -keeping to the archives of the Smithsonian, llovr- 

 over, my recollection of the matter, I think, is quite accurate and 

 is as folloiTS: 



The bore v.us 2-1/16" diameter; the stroke 2-3/4"; the pov/er developed 

 was 3 H.P, at 1800 R«P.M» and the -.veiglit v.-ns just ten (10) Ihs., in<i; 

 eluding carbureter, ignition coil and the sniill storage battery that 

 had a life of about five (5) ninutec service in firing the engine. 



I do not recall that any photographs -vore iT.ade of this engine except 

 while it -vras aasombled in the f reuae of the quarter-size nodel and 

 beMftvg that the pict\a*e8 ehovm in the Memoir arij as good as anj' 

 that T had of it. 



The cylinders of this engine v.^re made of heavy steel tubing turned 

 down to form thin integral radiating fins^T.ith the cylinder barrel 

 only 1/32* thick at tte bottom of the fins. Castiron liners v;ere 

 shrunk into these cylinders and were bored out to lerwe them l/32" 

 thick. The cylinder heads were taade from solid hand forgingsfraachined 

 outlvrhich vrer© screw threaded and brazed to the steel cylinder 

 barrels before the latter were finish machined. Tie general plan 

 of construction of it tsas similar to that of tho large engine exce^ 

 that it was air-oooled inetaad of •Hator-oooled. 



I '.Till try to look up some poraorilal memoranda that I have and so© 

 if I can give you more definite detailed data regarding the weight 

 of the engine and its aooesBoriegj butt, I think the above information 

 Is fairly accurate as to general feat\res. 



Yours very truly. 

 Figure 3. — Letter from Charles M. Manly describing the small gasoline engine. 



