j ferguson
User
Hi,
This is the design for a mostly foamboard mule for me to discover how to control a tandem wing electric - which when I get that down will lead to a more accurate swiveling and flying representation of a Switchblade 300.
I don't know what Aerovironment calls their vertical tail surfaces but they appear to be not just stabilizers but also rudders. Because of the folding geometry, the port surface can be extended to port but not to starboard and the starboard surface extended to starboard but not to port. Mule 4 shows how I'm doing it with the links which can be pushed but not pulled. I think Aerovironment did it another way, but it's not too clear how from all the photos showing crashed switchblades.
FWIW, the ends of the links have magnets on them and magnets are embedded in the "rudders" When these things are ejected from their launch-tubes, the rudders are folded forward against the fuselage against torque spring pressure of a springs (not shown on mine) would around the rudder pivot shafts.
My immediate problem is that I need to buy a couple of arms for the tail servo and I suspect I may need to fuss a bit with how big a servo it takes to handle this job. Arms will have to be alumnum and have threaded or threadable hole about 15 mm from the axis, and enough meat to support the loads the links and rudders are lijkely to impose. I'd thought about moving the servo forward and driving the link arm with a 6mm cf torque tube, but think what I show here will be simpler. W&B is so far unresolved. I'm going to make a couple of foamboard gliders to work out where CG has to be. Foamboard is quick for me. I built as accessory needle cutter for my CNC router and it works a treat.
SOOOO. Are most of the Arms Aloft so thoughfully offers bored for 6mm shafts and 23 tooth splins if this is what I order, and are most of the smaller servos with 23T shafts 6mm? i'd be happy to order a few arms and a couple of different size servos so I can work out exactly what I need.
What would you do?
john ferguson
st Petersburg, fl
This is the design for a mostly foamboard mule for me to discover how to control a tandem wing electric - which when I get that down will lead to a more accurate swiveling and flying representation of a Switchblade 300.
I don't know what Aerovironment calls their vertical tail surfaces but they appear to be not just stabilizers but also rudders. Because of the folding geometry, the port surface can be extended to port but not to starboard and the starboard surface extended to starboard but not to port. Mule 4 shows how I'm doing it with the links which can be pushed but not pulled. I think Aerovironment did it another way, but it's not too clear how from all the photos showing crashed switchblades.
FWIW, the ends of the links have magnets on them and magnets are embedded in the "rudders" When these things are ejected from their launch-tubes, the rudders are folded forward against the fuselage against torque spring pressure of a springs (not shown on mine) would around the rudder pivot shafts.
My immediate problem is that I need to buy a couple of arms for the tail servo and I suspect I may need to fuss a bit with how big a servo it takes to handle this job. Arms will have to be alumnum and have threaded or threadable hole about 15 mm from the axis, and enough meat to support the loads the links and rudders are lijkely to impose. I'd thought about moving the servo forward and driving the link arm with a 6mm cf torque tube, but think what I show here will be simpler. W&B is so far unresolved. I'm going to make a couple of foamboard gliders to work out where CG has to be. Foamboard is quick for me. I built as accessory needle cutter for my CNC router and it works a treat.
SOOOO. Are most of the Arms Aloft so thoughfully offers bored for 6mm shafts and 23 tooth splins if this is what I order, and are most of the smaller servos with 23T shafts 6mm? i'd be happy to order a few arms and a couple of different size servos so I can work out exactly what I need.
What would you do?
john ferguson
st Petersburg, fl
