04^2 



Popular Science Motiflth/ 



(lamps, before boring the holes for the 7 in. wide and sliaped as shown. Th; 



holts. The U-strap bolts will need to be runners are shod with wrought-iron shoes 



made b>- a local wheelwright or blacksmith, made of i-in. iron, and solidly attached to 



who will no tloiibt loan the clamps. the oak runners by long flat-head screws, 



Full details of the rimner-plank construe-, which are countersunk. Round iron is 



tion are shown in the drawing. The outside generally used for the shoes, and that the 



runner-guide is bolted to the underside of 

 the runner-plank i in. from the ouiside 

 edge. Two pairs of guides will be required 

 and they should lie made from straight- 

 grained oak, 14 in. long, 4 in. wide and 

 i}i in. thick. From the inside of the first 

 guide measure off i^ in. and bolt the 

 second or inner guide across the plank 

 I)arallel with the first one. This will leave 

 a slot i?4 in. in width between the guides 



iron may be rigidly clamped in place, a 

 slot or groove is cut in the bottoms of the 

 ruiuicrs to receive it. However, half- 

 round iron may be used, if desired. That 

 the shoes may "bite" the ice well, the 

 running surface is filed to a V-shape as 

 illustrated. When doing this work, con- 

 siderable care must be taken to make the 

 filed edge perfectly straight, for any 

 wa\'iness is certain to cause the craft 



MAST 5TEP , 5- HOLE. FOR 

 ° MNGbOLT 



-^ 7^ 



RUNNER PLANK, 

 Details of the backbone, runner-plank and its fastenings 

 together with dimensions of the parts of the ice yacht 



IRON SHOE 

 y^^FILE.0 SHARP 



in which to insert the runners later. 

 Carriage bolts J4 'i- in diameter are used 

 for fastening the guides in place. To 

 further strengthen the head of the plank, 

 an oak knee is Iiutted against the inner 

 guide and bolted to the ]ilank as shown. 

 Make the knees about iH in. long and the 

 same width and thickness as the oak guides. 

 When boiling the guides in place, take 

 [i.irticular care to ha\'e them absolutely at 

 ri'^ht angles to the jjlank, otherwise the 

 lM),it will "track" poorly, and pro\-e slow. 

 In order to get this right, clami) the pieces 

 in |)lace before boring the boli-iiolcs. After 

 all the nuts are set up on the bolts, peen 

 f)ver the edges of the bolt-ends so that the 

 nuts will not be lost should they hai)i)en 

 to Ifjosen up at any time. 



The side rimners are sawed from straight- 

 grained white oak, i}^ i"- tliick, 4 ft. long, 



to slide and deviate from its course. 



The completed runners are inserted lic- 

 tween the oak guides and "himg" to the 

 nuiner-plank b\- means of a Jo-'"- teeter- 

 bolt. Tile usual practice is to hang them 

 in the center of the runner siu-face as 

 shown, lea\ing a space of about -^.i in. 

 between tiie top of the runner and the 

 runner-j^lank. In boring the hole for the 

 teeter-bolt, make it a comfortably snug 

 fit, so that the runner will mo\e on the 

 bolt as uiion a pivot. 



The rudder, or steering runner, is made 

 of 1,'2-in. white oak, 3 ft. long and 5 in. 

 wide, it is shod with wrought-iron the 

 same as the side runners. Coinjilete details 

 are given in the drawing. The rud<ler-(itting 

 and tiller can be made by an>' ironworker 

 or local smithy. To alTord a good griji for 

 tiu' h.uid, tlu- end of the tiller m,u' be 



