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<html> <BODY BGCOLOR="#FFFFFF"></body> <HEAD><TITLE> What does the bottom look like?</TITLE></HEAD> <H1><font size=5><strong><center>What does the bottom look like?</strong></font></h1> </center> <center> <br> <center><img src="pencil+bottoms" align=top></center> <br> On the left, you can see a small electric craft hovering over a pencil. On the right, you can see two different styles of pumping air into a bag-skirted hovercraft's air cushion. The smaller vehicles are store-bought toys, and they use flow-through skirts, where first a fan pumps all the lift air into the skirt and then the air flows through holes in the skirt to create the crafts' air cushion, and then finally the air escapes out from the air gap between the skirt and the ground (or other surface). The larger two pink vehicles are homemade electric hovercraft models, and each uses the same skirt system as my full-size Weber Starcruiser -- some lift air is pumped into the skirt (which is sealed across the bottom -- no holes) and most of the lift air is pumped directly underneath the craft to create the air cushion the vehicle uses to hover. Flow-through skirts are less popular on full-size crafts (their holes can catch on obstructions, and they allow water to enter the skirt while off cushion on water and often do not allow the water to drain out when the craft gets back on cushion) but they are p opular among store-bought toys (perhaps because these are less likely to be used over water). <br><br><hr><br> <A HREF="http://www.ils.nwu.edu/~eric/model-hovers.html">Back to Eric's main model hovercrafting page</a> <br>