Howdy A few friends of mine are getting together and having a robot wars type battle in about 6 months. The only difference being they must be blimps! 1.5m max length is the only rule, projectiles allowed. As budget is an issue I wanted to run a few things by all the RC wizz's here My plan was to use 3 of those balloons from hospitals and the like, round but flat on the top and bottom. For extra lift I would place a down facing fan (like a helicoptor and for steering another prop at the rear. Very very quick drawing to show you what I mean. Click to view full-sized image! Hosted by UGBox Image Store My aim is for about 1 KG of lift. I was going to see if I could use either a remote or petrol driven car engine to power the props or see if I could get a 2nd hand heli and use that. Would love to hear your constructive critisim and any recommendations as to engine types etc what to look for or even if I could use one of those $50 helicopters you get at the markets? thanks!