RE: What drop plane do you use?
Right now I am using a Giant Lanier Stinger (ARF). I started off using 2 SR Telemasters. One with a Sato 150 and the other with a Sato 180. They worked great for a long time but the number of flights took its toll on them. I had a second Stinger 'till a few weeks ago-lost it with low battery on a spectrum system. Down to the one Stinger now and will probably not get more except I am going to build another Mud Duck to use to drop an R/C Skydiving Duck!
The present stinger has a Bryson 4.2 and is rigged to take 3 Mike Skydivers. The deceased Stinger had an Area 51 (Chinese) engine that had as much power as the Bryson. It's being repaired for less than $100.
In my opinion, the best rig would be the Stinger if you plan to drop 3 or 4 jumpers, otherwise I would use Sr Telemasters for 1 or 2 Jumpers. There are many other great jumping planes. Hope others will add to this list.
Before and after photos of the second Stinger!!!