| |
Hi!
I'm currently working on an aircraft in Technic and I need help to
construct an propeller. The model I'm copying uses a propeller with
six "blades" (are they perhaps named rotors?).
I figured that I can use the medium pulley wheel as base to mount the
blades on since it's the only piece known to me that has holes mounted
with 60 degrees difference (eg. 6 holes in a circle).
But how do I make the blades fixed in the right 60 degree position?
Is there a better way? I can mount three half-beams across the pulley
wheel but it will make the blades "offset" to each other and a
solution for this will look plain stupid, IMHO. Perhaps I can "fake"
the solution all around so it looks like it how it should be? Hey,
writing your problems down help :)
I tried to make one with four blades but I wasn't happy with that
design either.
Ideas? Suggestions? They're all welcome :)
Thanks for taking the time to read this!
Greetings from Sweden,
/Tobbe
|
|
| |
Well ... If you don't mind some small sticking-out bits, perhaps the 1/2
bushings and the steering arm piece with one hole at each end and the studs
in between, plus some small 2 or 3 long axles would do the trick? That is
the only thing I can think of, apart from making and pouring your own mold
for one. ;-)
Cheers ...
Geoffrey Hyde
Tobbe Arnesson <tnt@arnesson.nu> wrote in message
news:39c9bc60.4861780@lugnet.com...
> Hi!
>
> I'm currently working on an aircraft in Technic and I need help to
> construct an propeller. The model I'm copying uses a propeller with
> six "blades" (are they perhaps named rotors?).
>
> I figured that I can use the medium pulley wheel as base to mount the
> blades on since it's the only piece known to me that has holes mounted
> with 60 degrees difference (eg. 6 holes in a circle).
>
> But how do I make the blades fixed in the right 60 degree position?
> Is there a better way? I can mount three half-beams across the pulley
> wheel but it will make the blades "offset" to each other and a
> solution for this will look plain stupid, IMHO. Perhaps I can "fake"
> the solution all around so it looks like it how it should be? Hey,
> writing your problems down help :)
>
> I tried to make one with four blades but I wasn't happy with that
> design either.
>
> Ideas? Suggestions? They're all welcome :)
>
> Thanks for taking the time to read this!
>
> Greetings from Sweden,
> /Tobbe
|
|
| |
I can't figure out right know if it is possible or not, but there is a
3-blade configuration (designed around 1981-2, which is obsolete now
since the 3-Blade technic rotor part have been introduced) which can be
a starting point or at least inspiring to go ahead.
Look at the 3-blade propellers of:
http://news.lugnet.com/cad/dat/models/?n=1036
http://news.lugnet.com/cad/dat/models/?n=1032
I hope these would help.
Selçuk
Tobbe Arnesson wrote:
>
> Hi!
>
> I'm currently working on an aircraft in Technic and I need help to
> construct an propeller. The model I'm copying uses a propeller with
> six "blades" (are they perhaps named rotors?).
>
> I figured that I can use the medium pulley wheel as base to mount the
> blades on since it's the only piece known to me that has holes mounted
> with 60 degrees difference (eg. 6 holes in a circle).
>
> But how do I make the blades fixed in the right 60 degree position?
> Is there a better way? I can mount three half-beams across the pulley
> wheel but it will make the blades "offset" to each other and a
> solution for this will look plain stupid, IMHO. Perhaps I can "fake"
> the solution all around so it looks like it how it should be? Hey,
> writing your problems down help :)
>
> I tried to make one with four blades but I wasn't happy with that
> design either.
>
> Ideas? Suggestions? They're all welcome :)
>
> Thanks for taking the time to read this!
>
> Greetings from Sweden,
> /Tobbe
|
|
| |
Tobbe,
You could possibly use 2 of the Technic 3 bladed rotor parts, rotated 180
degrees from each other. This gives 6 blades, but 3 of them are set back 1
plate's depth. You could possibly build them up a bit to be even.
The Technique 3 blade rotor part looks like this:
http://www.lugnet.com/cad/ldraw/parts/ref/search.cgi?q=2712
-Andy Lynch
----- Original Message -----
From: "Tobbe Arnesson" <tnt@arnesson.nu>
> I'm currently working on an aircraft in Technic and I need help to
> construct an propeller. The model I'm copying uses a propeller with
> six "blades" (are they perhaps named rotors?).
>
> I figured that I can use the medium pulley wheel as base to mount the
> blades on since it's the only piece known to me that has holes mounted
> with 60 degrees difference (eg. 6 holes in a circle).
<snip>
|
|
| |
Use indeed 2 Technic 3-bladed rotor parts, put on each blade 3 Technic
half-beams (with rounded ends) and put the rotor parts on an axle, face to
face, turned 180 degrees.
Voila, plain and simpel, all propellor blades in line, further enlargements as
you wish.
Need more info? Mail me for a simple instruction-picture, with 'blades' made
of 7-holes half-beams. (in terrible colors !!)
Klaas H. Meijaard - Holland
--------------------------------------------------------------------------------------------
Andy Lynch schreef:
> Tobbe,
> You could possibly use 2 of the Technic 3 bladed rotor parts, rotated 180
> degrees from each other. This gives 6 blades, but 3 of them are set back 1
> plate's depth. You could possibly build them up a bit to be even.
>
> The Technique 3 blade rotor part looks like this:
> http://www.lugnet.com/cad/ldraw/parts/ref/search.cgi?q=2712
>
> -Andy Lynch
>
> ----- Original Message -----
> From: "Tobbe Arnesson" <tnt@arnesson.nu>
> > I'm currently working on an aircraft in Technic and I need help to
> > construct an propeller. The model I'm copying uses a propeller with
> > six "blades" (are they perhaps named rotors?).
> >
> > I figured that I can use the medium pulley wheel as base to mount the
> > blades on since it's the only piece known to me that has holes mounted
> > with 60 degrees difference (eg. 6 holes in a circle).
> <snip>
|
|
| |
Thanks all!
I'll answer you one by one.
Geoffrey, I'm not quite sure I understand what you mean *blush*. Are
you refering to the 1x4 plate with a hole in each end with "notches"
around the hole and some half-bushings? This solution would make the
depth of the propeller 6 studs and the different blades rather offset?
Selçuk, I'm not that used to the CAD softwares availible, I tried to
find the model where it was used though and had no luck. But I'm
afraid this is a "one piece" propeller that can't be customized, eg.
no studs?
Andy, your idea is a great solution except the fact that I need to
build four of these and I don't own that many 3 blade rotors :(
I have done some thinking of my own and made up a quick CAD-file of my
thought, please take a look of it and let me know what you think.
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=15512
I then equip it with cross-axles as blades and perhaps custmize them a
tad or two. My biggest worry will be that the cross-axle can come
loose from the center when I motorize it. I'd better find me some good
"Technic Connector Toggle Joint Toothed".
I also need to replace the number three cross-axles in the CAD-drawing
with number four. When I realized my mistake I was to lazy to replace
them ;)
TGIF!
/Tobbe
|
|
| |
> Use indeed 2 Technic 3-bladed rotor parts, put on each blade 3 Technic
> half-beams (with rounded ends) and put the rotor parts on an axle, face to
> face, turned 180 degrees.
> Voila, plain and simpel, all propellor blades in line, further enlargements as
> you wish.
Et voila indeed!
Hope I had the eight 3 blade rotors needed, do they come in black? I
have to see if I can find a good source for them. Se my other answer
in the original thread for my latest idea.
Thanks!
TGIF!
/Tobbe
|
|
| |
Tobbe Arnesson wrote:
>
>
> Selçuk, I'm not that used to the CAD softwares availible, I tried to
> find the model where it was used though and had no luck. But I'm
> afraid this is a "one piece" propeller that can't be customized, eg.
> no studs?
No no... It's built from the basic parts like 6-hole small technic
pulleys, 1/2 pins and regular plates. This simple design dated from
early 1980's, there was no such propellers exist at that time. Look at
the picture
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=2081 for a fuzzy and
blurry picture. It's tail rotor of the helicopter
Actually, I think it could be converted to a 6-blade one by the help of
newly introduced rounded-end 1x5 plates with axle hole (new versions of
the old 2-blade technic rotor, with holes and teeth removed) but I think
yours is much more sturdy, although thicker.
Selçuk
|
|
| |
Tobbe Arnesson wrote:
> I have done some thinking of my own and made up a quick CAD-file of my
> thought, please take a look of it and let me know what you think.
>
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=15512
I think that looks really good, very like the real thing in fact. A 2x2
cone such as the yellow one found on the exhaust (?) of the 8860 supercar
could make a good spinner as well - although it would be better in black
or grey, of course.
Jennifer Clark
|
|
| |
> Hope I had the eight 3 blade rotors needed, do they come in black? I
> have to see if I can find a good source for them. Se my other answer
> in the original thread for my latest idea.
I've noticed that 1x plates attached to the holes of a 6 hole pulley don't
move around very much. So to make a propellor, (with 3 blades offset by one
or two plates), attach 3 1x plates to a pulley so they stick straight out.
Do the same on another pulley. Put the pulleys on an axle, and you've got 6
plates extending from a small hub. Attach some 2x plates creatively, and
you can even get rid of the offset.
--Bram
Bram Lambrecht
BXL34@po.cwru.edu
http://home.cwru.edu/~bxl34/
|
|
| |
> > I have done some thinking of my own and made up a quick CAD-file of my
> > thought, please take a look of it and let me know what you think.
> >
> > http://www.brickshelf.com/cgi-bin/gallery.cgi?i=15512
>
> I think that looks really good, very like the real thing in fact. A 2x2
> cone such as the yellow one found on the exhaust (?) of the 8860 supercar
> could make a good spinner as well - although it would be better in black
> or grey, of course.
Thanks!
Taken out of my mind I think the spinner was supposed to be around
32mm in diameter and the cone is a little to pointy, I have to look
into this, thanks for the idea Jennifer!
Thank God I can go home now, work has been terrible, as usual when an
ISP looses it's Internet connection ;)
CU!
/Tobbe
|
|
| |
> No no... It's built from the basic parts like 6-hole small technic
> pulleys, 1/2 pins and regular plates. This simple design dated from
> early 1980's, there was no such propellers exist at that time. Look at
> the picture
>
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=2081 for a fuzzy and
> blurry picture. It's tail rotor of the helicopter
That is an blurry picture indeed! It's impossible for me to make
things out of it... Dang...
> Actually, I think it could be converted to a 6-blade one by the help of
> newly introduced rounded-end 1x5 plates with axle hole (new versions of
> the old 2-blade technic rotor, with holes and teeth removed) but I think
> yours is much more sturdy, although thicker.
Well, the thickness should not be a problem. The propeller blade will
have a length of 96mm or 12 studs, that's the radius for the prop
folks ;)
Well see monday if I made something up, won't check in here 'til then!
CU!
/Tobbe
|
|
| |
"Tobbe Arnesson" <tnt@arnesson.nu> wrote in message
news:39cb09b1.90191258@lugnet.com...
> Thanks all!
>
> I have done some thinking of my own and made up a quick CAD-file of my
> thought, please take a look of it and let me know what you think.
>
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=15512
One thing you can do with this also is replace the 6 outward stubs with a
technic liftarm--either the 1x3 one (part 6632), or the 1x4 one (part 2825).
This has a few consequences. One, it makes the structure slightly more
compact vertically (assuming that this is axis of the prop is vertical).
Second it changes the connection points to something that I feel is more
conducive to propeller blades. Instead of having axles radiating outward,
you have liftarms, to which it is easy to attach plates.
I found that it also allows for additional structural support, if you choose
to add it. I took a few pictures with my digital camera of a prop that I
put together. You can kind of see the extra support I added (the black
pieces) in the last two pictures. Sorry about the use of black, which
doesn't photograph well, but I didn't have anything else handy. The
pictures can be found here:
http://home.san.rr.com/tcobbs/Misc/Prop.html
--Travis Cobbs (tcobbs@san.REMOVE.rr.com)
|
|
| |
> One thing you can do with this also is replace the 6 outward stubs with a
> technic liftarm--either the 1x3 one (part 6632), or the 1x4 one (part 2825).
*bonk*
Now why didn't I think of that? Thanks :)
/Tobbe
|
|
|
