"did you ever get a response on this?
i've built a custom octa frame (H layout) so it's not quite like the +, X, or V."
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j.baum53's Discussions
how cheap can I make it?
Started this discussion. Last reply by R. D. Starwalt Aug 2, 2012. 1 Reply 0 Likes
I was wondering what to expect as a minimum cost for a bare bones UAV, either copter or fixed-wing.Continue
Is there a formula for prop lift?
Started this discussion. Last reply by Knut Graf Jun 5, 2012. 10 Replies 1 Like
In a copter, Is there a formula for how much lift is generated by a prop, or are there normally stats for how much upwards thrust is generated for a prop at a certain RPM range? or is this just trial…Continue
Are ESCs Necessary?
Started this discussion. Last reply by j.baum53 May 27, 2012. 20 Replies 0 Likes
what do they do?are they needed?Isn't arming/disarming them a pain?how should they be used?how many do I need?any other information would be greatContinue
Scratch-build
Started this discussion. Last reply by j.baum53 May 25, 2012. 8 Replies 0 Likes
where do I start?what should I do?I have no idea, because I'm scratch-building my own quad as soon as I figure out how. any tips/ideas would be appreciatedContinue
Tags: scratchbuild, mydrone, octo, copter, what
j.baum53's Page
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"Wow. That is a tough/improbable question because you have provided no specifications for the project.
Do you want to scratch build an airframe? Plausible for fixed and multirotor, not likely for traditional heli.
Sorry, more specifics please."
j.baum53 posted a discussionhow cheap can I make it?
I was wondering what to expect as a minimum cost for a bare bones UAV, either copter or fixed-wing.See More
j.baum53 commented on patrice.rance's blog post Recycling Propellers"very nice. it seems to work well, and is a nice way to save time and, more importantly, $$$."
j.baum53 commented on Jean-Louis Naudin's blog post APMRover 2, a fun UGV project for full autonomous recon missions..."hey, is anybody willing to advise me as to how to fix my rover/car?
it ran into a piano and the RC receiver/controller circuits are non-functional now. (it will not respond to signals)
the motors are fine, it's just the RC circuits.…"
George Myers replied to j.baum53's discussion Designing custom octo frame"You may have not gotten any input due to all your questions and more have been ask, answered, in many different ways already on the forum. Spending some time reading all you can on the forums here will most likely answer any question you could…"
Knut Graf replied to j.baum53's discussion Is there a formula for prop lift?"Take a look at eCalc:
http://www.ecalc.ch/xcoptercalc_e.htm?ecalc
While it does not show you its formulas, it will collect lift for a given setup.
"
Brad Hughey replied to j.baum53's discussion Is there a formula for prop lift?"Virtually all model airplane propellers are designed to move forward at some velocity. There is an important parameter in propeller aerodynamics known as advance ratio, which is the axial velocity divided by the tip speed or V/nD. When…"
Brad Hughey replied to j.baum53's discussion Is there a formula for prop lift?"Yes, there is much about helicopter aerodynamics that is not intuitive, even for someone well-versed in classical mechanics. If fact, that question you just asked has all sorts of permutations.
For a fixed-pitch multicopter, rotational inertia…"
j.baum53 replied to j.baum53's discussion Is there a formula for prop lift?"so...
there is a difference between static props and those with velocity?
care to explain more?"
Jonathan M replied to j.baum53's discussion Is there a formula for prop lift?"Theoretically you get more efficeint with higher aspect ratio. Most thrust data backs that up, but like Brad said, statically operation isn't always as straightforward as props with an velocity. All of the props we now use, are…"
j.baum53 replied to j.baum53's discussion Is there a formula for prop lift?"wow... I have a lot to learn.
thanks a lot.
P.S. is there any problem with blades that are too large? larger blades at slower speeds have the same lifting capacity, and if necessary, they can lift heavy loads"
j.baum53 commented on Adric Landman's blog post Cat Quadcopter"this is something you shouldn't do to a poor, innocent quadcopter! (lol)
(or a cat), nevertheless, it looks awesome, and he knows which way is the front :)"
j.baum53 replied to Ellison Chan's discussion Brainstorming Specifications. in the group DIYDrones - CNC Project"so, is this 2 or 3 axis for the table, and 3 or 4 for the machining arm?
not a six-axis arm, right?"
Brad Hughey replied to j.baum53's discussion Is there a formula for prop lift?"At the grave risk of self-adulation, I recommend this thread, which covers the basics pretty well:
DIYD Thread on Lifting Propeller Aerodynamics
The raw data on most of the common hobby props can be found…"
Brad Hughey replied to j.baum53's discussion Is there a formula for prop lift?"Martin himself admits that his otherwise excellent JavaProp program uses a mathematical model that begins to break down at low advance ratios. I recommend the site myself as an excellent primer for propeller aerodynamics, but sometimes, static…"
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