ORIGINAL: mranga
ORIGINAL: billd76
ORIGINAL: acdii
I haven't given it much thought. For the planes I have flown so far, when the motor quits, it's time to land and recharge. I have to rethink that thought though, my next plane will have a gas motor, so I will need to get into the habit or recharging the RX and Ign packs.<div> </div><div>I still haven't purchased the packs for the P-51. I discovered last night the RX for my Futaba will take 7.4 volts so I can use a 2S 25C 2000 mah pack for the RX. That will save some weight and give me quite a few flights, but want to stick with 4.8 for the ignition, too many reviews showing problems with higher voltage. </div>
you will love gas! long flight times and cheap fuel! well, cheaper than batteries or nitro
This is another thread (not related to the original question) but what are the smallest available gas engines equivalent to (compared to an equivalent nitro) ? I understand they are much more reliable as well.
Ranga
JBA makes a 15 cc. One would use this on a .60 sized plane. That is the smallest I know of. Although I do know some folks that have installed it on a hangar nine twist .40. Gas is very reliable and once it's tuned you rarely have to ever mess with it again. Most guys file with two batteries, one for the engine ignition and one for the Rx. You will also need an opto kill switch. This allows you to kill the gas engine is something goes wrong. There are two basic types of kill switches. One that works directly with the engine ignition and battery and another types that will work with just one battery including the igntion. Which eleminates the need fro the ignition battery, thus savign some weight. The switch is activated by a switch of your liking on the Tx. Some guys will also install a micro servo on the choke of the engine as engaging the choke will also kill the engine. Ignition batteries for most gas engines cannot exceed six volts. Another thing to remember is that you have to use a gas compatable plug for your fuel tank. Nitro fuel tank plugs will basically melt when gas contacts the surface. Special fuel tubing is need as well. And the clunk line in the tank should be checked regularly (once per year is what I do) , gas causes the clunk to harden when not used for awhile. I change out the clunk line every year just to be safe. Flight times are the best thing about gas!! I have a 24oz tank on my PT 19 that has a 26cc SPE gaser on it. I can fly for 45 minutes easy and have plenty of fuel in the tank for landing!!
I have never flown for 45 minutes at a shot. but after 25 minutes, I still have over a 1/4 tank left.