/diy/ - Do It Yourself

how many million $ you got?

I want a quadcopter I can sit on.

>>404236
i want a star trek matter transporter. how build?

>>404236
how do military industrial complex in backyard and make giant biplane that's I'm assuming completely unable to be licensed under personal aircraft laws?
OP, are you by chance related to one of the oil barons of Dubai? No? then you have 0/0 chance of doing this.

>>404241
I am not looking to make carbon copy of C-130, just of similar size and design.

A boeing B-17 only cost about 200k usd to build

>>404261
Main problem is finding and transporting build material.

Anyone have source for long steel I-beams of different size?

>>404246
Not looking for spoon feed of information, mostly just want to make discussion.

>>404265

look -- your problem, that we're all joking around, is that no-one designs aircraft like that. no ONE -- the scope and scale and depth and complexity of a machine like that is beyond any single person. or small team. it's not even good masturbation material.

> B17 $200K

bullshit, and never mind 70 yrs of inflation. that is not the SYSTEM COST of design, and you cannot use ww2 era war economics or scale as a comparator. "only $200k" -- whatever the real cost, that was due to the existance of an industrial complex of even today unthinkable scale.

OP is an idiot and this thread is parallel to tinfoil hat territory.

I'm also a pilot (I have my CPL with multi-engine, night, and IFR class 1 ratings), and whenever I say that being a pilot isn't necessarily an indicator of intelligence, people don't believe me.
Well, after seeing OP, do you believe me when I say that some pilots can be complete and utter retards?

designing the airplane isn't the issue, a desktop PC can do all the aerodynamic and mechanical analysis involved in that now (with the right software).

the problem is that the licensing restrictions put on such an aircraft would make it highly impractical to even bother with.

Op you're better off just hooking an off board motor to a hang glider and hoping for the best.

design your own rc model

Your design criteria are ridiculous. Do you have any idea how large and heavy C-130 actually is?
>>I already have my PPL and I'm college for degree in mechanical engineering, how much aeornautical engineering knowledge does it take
You're pretty delusional if you think you design every part and structure involved on your own.
Also, how many millions of dollars do you have to burn on a project like this?
The larger an aircraft the more complex its systems become due to dependence upon hydraulics, and the amount of deflection and dynamic loading they experience.

>>404276
I get reminded about that every time some retard flies a c172 at weight limit up into the mountains and crashes trying to take off on the return flight

>>404325
I'm with this guy. One man does not design and build an entire cargo plane, even with off-shelf components. Also a C-130 sized biplane is a retarded idea, given that a C-130 can already carry a ludicrous amount of cargo and still take off and land extremely well.

>>404336
We have fewer problems with that up here in the Canadian prairies since we're already at around 3000-4000 feet, but retards still don't seem to understand weight issues. Nary a month goes by without someone in the province overloading their plane by hundreds of pounds or simply not understanding centers of gravity which leads to them crashing on takeoff or landing.

General aviation gets a really bad safety reputation from the hundreds of rich retards who think they're beyond 5 minutes of simple math or think they're invincible and MTOW is just a recommendation.

Well, now that we're done ragging on OP, how likely do you guys think that I can build my own simple helicopter?
I'm willing to spend about 1k-500k on this project.

>>404469
Build a gyrocopter instead. They can stay aloft at very slow speeds and if you have an engine failure you're less likely to die.

Could you even use motorcycle motors to build a small aircraft? Such as a Beechcraft Baron?

>>404469
Fuck right off
>>404263
>long steel I-beams
>steel used in any aircraft = Are you fucking stoned you trolling piece of sphincter meat ?

No, but you'll need to cover them in very thin lead sheets. If you cannot find lead, Cement slabs will do in a pinch.

>>404477
>motorcycle engine
>in an airplane
That's fucking brilliant, do it and tell us how that works out.

>>404485

There is a yahoo group dedicated to using motorcycle engines in experimental aircraft

>>404488
Yahoo groups are a great source of aeronautical engineering advice.
Check this out: an aircraft engine, especially an under powered one, as a bike engine certainly would be in a 3000 lb Baron, is gonna be under WAY more stress than a bike would put it under, and when it throws a rod, you could fucking die.

>>404495

Well, if you geared it right,

>>404495
>an aircraft engine, especially an under powered one, as a bike engine certainly would be in a 3000 lb Baron, is gonna be under WAY more stress than a bike would put it under, and when it throws a rod, you could fucking die.
Most piston aircraft engines only have stress on the main driveshaft if it's a direct-gear setup, since the prop is pulling the rest of the plane by whatever it's connected to. That's mostly the main point of stress, although most aircraft over 3500lbs MTOW have variable-speed props with gearboxes, and that takes a lot of stress off the engines.

Small aircraft engines are also quite weak. The average C172 has between 125-200HP power output at full RPM, and are usually run at 70-80% power for cruise.

For their purposes, a motorcycle engine would run an ultra-light or very light homebuilt aircraft easily, as long as you keep it ultra maintained and solve the problem of variable cooling rates depending on what the aircraft is doing. Also making sure you have redundant magneto systems.

>>404477
What the fuck. A Beechcraft Baron is a multi-engine variable-speed prop 5000lb MTOW 250-300HP/engine aircraft. If you can't even build an ultralight, why the fuck are you thinking of building a multi-engine aircraft?

>>404500

Not OP

>>404500
>>404500
I was talking more about the sustained throttle and RPMs it would have to deal with.
You could probably at least take off in a Baron if you had some high-revving I4 bike engine, but I figure you would be at full or nearly full throttle close to the redline to take off or climb, so the engine wouldn't last.

>>404236
>>404245
>>404261
>>404263
>>404477
>>404497
To everyone posting above, I will tell you what your parents/teachers never could: Stop. Stop what you're doing this instant. Just stop.

The world needs shelf stockers, ditch diggers, barristas & cell phone hucksters, along with door-to-door minority broadband "sales" persons.

DO NOT tax your brain and those around you by aspiring to such pipe dreams as C130 sized biplanes or free energy or Rasberry PI controlled fleshlight Jack-O-Matics.

Anything beyond opening a common doorknob escapes you.


You exist to serve to more intelligent of us.

Learn you place in a dying society

>>404508

Wut...no rp J-o m's???

Yer shitting me...rite?

You can have all the engineering experience in the world, but if you do not have any welding or machinist experience good luck building anything.

I have a few engineering and aerospace engineering friends. None of them were taught any practical skills.

>>404524
I'm burning my /diy/ gold card. I stuck around for the schematics for the Rpi J. O. M.

>>404527
mechanical and aerospace engineering*

>>404531
Welding is a 1st year Mech. Eng module over here.

>>404562
Its good to know at least some programs teach you practical skills. Was it very intensive or was it just a general intro?

>>404563
Dismantle a car and weld some shit together

>>404564
no i mean how many months did you spend on welding or was it only a class or two? Did you do any X ray testing on your welds or do bend tests or other stress tests on them?

>>404236
Stick to microlight/experimental aircraft! A large aircraft, no matter how simple, is an incredibly difficult job. They've never been designed by a single person. You'd need hydraulic engineers, production engineers, avionics, mechanical, aerospace and material engineers.

Try building a kit microlight first, understand how a small aircraft structure works, then look at an experimental build. You can find many airfoil sections (NACA etc.) on the web.

>>404469
>>404472
Fairly likely. As the other poster said, try a gyrocopter instead, but if you must have a look at microlight helicopter kits. Hell, the Mini 500, a near full featured helicopter was only $24,500.

Good luck!