Straight talk about line cutters
The all Stainless Steel Piranha line cutter is not the first line cutter to be offered to the High Powered Rocket Community. While it is not known who first made a line cutter for high powered rocketry, I believe that the Arch-type line cutter has been the most popular. It had an aluminum body and presumably a steel cutter and steel Allen screw cap. By all accords that I know of, this unit seemed to work. While aluminum is lighter in weight, much easier to machine and much less expensive than stainless steel, its longevity is unknown. The all stainless steel Piranha line cutter while still very lightweight, will likely last the lifetime of the flyer!
Why choose the Stainless Steel Piranha line cutter over any other line cutter?
$95 for two (Redundant devices is STRONGLY recommended!)
Make no mistake about it, for doing Dual Deployment from a single compartment using a drogue parachute in the traditional manner, there is nothing better than the Tender Descender!
So then why use a line cutter?
Flying Drogueless with a bound parachute
While a Tender Descender works ok for holding together a "burrito wrapped" parachute, it is not really the best method of restraining the bound parachute. Truly the best method of restraining a Nomex bound parachute is with either light weight nylon cord or with a plastic zip-tie. The cable cutter is used to quickly release this restraint at an altitude determined by your altimeter and free the parachute to deploy.
Reefing a parachute for dual deployment using a single parachute.
Now THIS is exciting! The Stainless Steel Piranha Cable Cutter can be used to employ a single parachute as both the drogue and the main by "reefing" the chute so that as a drogue the parachute acts more like a streamer then when the reefing line is cut and released the chute can fully inflate to become the main!