Very nice work producing the electric version!
MK released the original Chipmunk, Laser, Spinks and Zlin kits around 1983. They were popular enough that MK produced ARC versions of all 4 (built from the MK kit, of course). The slightly larger 'S' version was released around 1987. I don't know why MK released the second Chipmunk kit and I would like to fly them both on the same day to compare, but I do know that Naruke flew a Chipmunk at the TOC and I suspect it may have been a personal favorite of Mr. Naruke and Mr. Kato. There may have been some marketing strategy, too, as you could get the later Chipmunk S with rearward retracting MK retracts. MK also produced two versions of Quique Somenzini's Extra 300 FAI adaptation; a 2 meter version (including retracts) and a '90' sized version which was actually a bit bigger than their previous 120 sized semi-scale offerings (I'd still like to find the 90 sized kit). They all fly very well and were quite competitive back in 'the day'.
Are the plans for the electric version available? I' d like to build a bigger version powered with an OS 140RX.
I'm looking forward to reading the flight reports!
- Will