I aquired a couple Homelite UT20683 trimmers with an onboard electric starter and battery pack.They are 25cc with clutches.I found out that the battery pack is 4.8volt and I took one apart to see what type batteries are in it and there are what looks to be four sub C Nicad batteries,to make the 4.8 volts.I haven't tried to charge them with a charger that came with one of the trimmers,but I suspect that they are bad after sitting for a couple years,in the cold and heat.I'm going to take the plastic shrouds off one of them and see what's under there and will post pics of the engine.
In looking at an engine parts diagram I saw what's called a compression release valve on the cylinder.What's the purpose of that ?Is it to make the engine easier to start ? In an RCU search I found a thread where someone else had these also,but there was no mention of one being converted to an airplane engine,using the electric starter.Has anyone used one and has not posted the results on here ?
I think it would be neat to be able to start the engine with maybe the starter button on the plane somewhere or start it using a servo connected to a switch.
I found a post where someone was converting one into an r/c boat engine and relocated the starter motor up and to the side instead of the engine bottom to get the engine lower in the boat hull.Pics below.
http://www.ereplacementparts.com/hom...99_200250.html