i was thinking about a craft, that capable to recover my stranded craft from far...and i was wandering behind many ideas...then once i saw a posting in Model Boat Mayhem,from Mr Martin, about a craft, is EDDA FONNE, was a great craft, and was equiped with a working crane...but all such machines were based on real hydraulics...so here i do not have any such pumps and tubes to use o operate my craft..so i turned to my draing board and solved my head ache...

i started from thermocol as usual..

followed...

and on..

then i took a intense study about a backhoe loader , and found one thing..the total movements were activated by the movements of pistons attached to each booms...so it was simple...then i choosed some toy gear boxes for me...

but still, i was thinking about a wireless controlling system for my craft...i do not have any computerised radio system, with 18 or 20 channels...no hydraulic pumps..no powerfull motors...no lathe works...and alone...so , for testing i used some toy rc systems...then, keeping in mind, my need,as 6 channels, i converted a toy rc system in to RADIO MATRIX MODE, to get a 6 channel by same carrier wave...so i made a simple audio coded PWM, system in my RC system...after some trial and errors method it started work flawlessly...so i got the control system...and i choose 4 power transistorised output system,in final stage of my transmiter...i do not know the exact range of transmission from TX,but i tested it with my Pachu,my student boy, as i fixed the reciever on his bicycle,and a motor, then send him on...after reaching a culvert, he called me in phone..there is a booth near to culvert...so the culvert is situated 2.5 kms from my grand home...then it worked without any trouble...so i got enough confidence with it...figures showing the fixation of gear box assys...

  C9 shows its attachment...all booms are 1mm thick foam board...

C10 shows the upper boom..pivoted just like a excavator...

then i feixed a compound independent gear box, behind the main gear boxes  as C11...

C12 shows the boom pivot and actuating piston...the piston is a ball point pen body, and the piston is nothing but a brass rod, and its tip was flattened by hammering and a hole was drilled to fix on the cross rod of upper boom....

as booms finished, it was the time to make cabin....all from thick drawing papers...

then i fixed two identical  pinch rollers just under the main platform for a great and smooth circling...as in C14...

the fig 16 shows the boom actuating gearbox setups...

yes, the working principle behind the working booms are simple..the lower boom is simply attached to the main gear box, as you can see in fig C8..
so when the motor start to turn..the boom also go up and down....

how it works..? see the mechanical video here...

then the upper boom is actuated by a piston ,is a ball point pen, with a brass rod in it,and a fishing line is tied just to the inside tip of the brass rod...as you can see in C31, and C32...and C33...and after guiding the fishing line through hidden panels of booms itsels,it reaches at the tips of the gear box shafts, as you can see in fig C36...and i tied all fishing line on to the gear shafts...so when the gear start to rotate, it also winds up the fishing line attached to it...so after some turns the fishing line start to get tension, then pulls the brass rod...the brass rod is attached to cross bars of each boom and manipulator...so it also will be actuated...so simple...

after workout i checked the booms with weight..it can easily hold 1 Kgs in hang...so after thourough check ups, i made the whole exterior...all from foam board...C24, C25 shows the bodywork...i added a loads of talcum powder in to deep orange paint, to get a matt texture...
then i turned to propultion...the main gear box is from a toy car, but with a reworked motor for 7.2 volts...basiccaly it was a 3 volt motor...you can see the gear box in fig C37...

the propeler took from an old scraped grapix card of a PC...and added a nozzle from a PVC pipe...so doing well...from C 26, to C 29 you can see the propultion mechanism...i fixed a tiny eyed net around it to avoid stranding.....

and on...

the bow thrust pump is made out of foam board and driven by a reworked motor for 9 volts...a take up wheel from a VCR stands for the gear system of the thrust pump...C38 shows this in detail...

you can see the radio waves before in MATRIX, and after in MATRIX...(scope 2)

he fig C36 also shows the simple setups and a simple 7.2 volts 200 ma battery for total manipulator controls...

i finished it in to bright orange...

and it weighs in to 800 grams with full battery packs...

sure..here is the working and a simple mission video...