welcome to the most advanced research project ever, based on
, it will feature:
overall similar design to Electrosonic. cheap i know.
heavier epoxy-post-tube or PVC construction
plastic or aluminium fins NO WARPING
internal spring-switch for apogee detection
motor fittings of steel
2-stage one-piece motor, air-speed re-ignition
more powerful rechargeable onboard battery, no swapping
more powerful motor developed, 40mm.
some other ideas that might show up are:
on-board ignition of first stage
clockwork or electronic timer for parachute and/or failsafe
shrieking piezo location alarm
RC ignitor box / launch switch
basic altitude sighting and triangulation
motor test pressure and thrust monitoring
Work has started on this project. i've been investigating deployment systems,
and have part of one working in a crude form. this is a most pressing issue
considering what happened to Electrosonic I. though the air-speed switch
has worked in quite
ambitious rockets for Richard Nakka it has inelegancies:
easy to fool
alternatives i'd found were magnetic sensing of orientation, photo-comparatory
sensing of tip-over and a mechanical free-fall switch mechanism thing.
the first two required electronics and the third, i couldn't actually find details about,
when i went looking. the first, magnetic detection, relied on a hall-effect chip a bit
like a compass, which turned out to be very expensive. it would otherwise no doubt have worked.
so i proceeded with the 2nd. this involves comparing the voltages of two light-sensing circuits
and outputting a voltage when the relationship between the two reverses. one sensor is pointed
skyward and one soilward, and they can be either CdS light sensors, or light dependant resistors.
all the components seemed relatively available so with some helpful correspondance from
originator of the system, i built a working one.
there was a fair bit more trial and error and swearing than i have detailed, but i am confident
that it will work, with a complete rebuild.
then of course, i found the mechanical one
both have shortcomings:
mechanisms need to be carefully constructed, electronics doesn't
the mechanism is bone-simple and can pass high current
the electronics is probably harder to fool
without actually trying both its hard to know, but i think the mechanical one is harder to test on
the ground and could come unstuck if the rocket goes off at an angle. the electronics is more likely
to deploy, but it could do so at a high speed, also if the trajectory is crooked.
maybe i should use both, i haven't decided.
Optical apogee detector test circuit =D
20th May - Nozzle News is Good News
i've worked out what the nozzles should be like, and am working on the nosecone.
Bulkhead for bigger motor - blueprint
Nozzle for smaller motor - blueprint
Nozzle for bigger motor - blueprint
i investigated "spinning" the nozzles, but my achievements have been a bit discouraging so far [pics],
so i might have to have them machined from "Ledloy" steel.
the nosecone will be cast in a 3-part plaster mould hopefully, and comprised of reinforced epoxy of some sort.
before i can do that, i need to make a wooden blank... [drawing]
nozzle renders from Blender
August trans-winter drawings
after a bit of discussion and to-and-fro with engineers i drew up these plans with a pencil.
the idea was that they would be clearer and more legible, all i can really claim is that they
have measurements explicitly labeled, instead of a grid you have to squint at.
click for 1000px
click for 1000px
i haven't finished the nosecone form of course, but i have aquired a selection of neodymium-tipped darts.
highly lethal, highly magnetical and in attractive red and green colours! do not eat.
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