You should look at a 2 part urethane foam.They make prop weapons with it. My model shop uses Smooth-On products like Foam-IT. You can get foams in a ton of different expansion rates that pour like liquid.
Thanks for the suggestion! I have used foam-it with other (school)projects, but sadly its not really readily available in hardware stores and such, and I wanted something that anyone could do at home. Also, not sure if it would avoid the "expansion of the wing", maybe it would be less dramatic if i use a slowly expanding foam? Thanks! -SunShine
Hi Sir, i remember years ago i replaced a plywood floor in a boat i think i drilled holes and used a 2 part foam..is this basically what you are talking about? I am 3d printing some 12 inch statues in vase mode...thinking if i could drill hole in bottom and pour approx 1 once or less and it should fill model and excess will come out of hole without expanding the sculpture...or maybe even the foam in can would work fine also this way...just don't want to drill holes in top just bottom..Any thoughts thanks for your comment
Here in comments are many viable suggestions. The foam hardens by absorbing moisture actually, therefore you can splash inner surface with water so as inner shell harden faster. And in the hollow part, the rod of some squashable material can be placed to mitigate the foam expansion. I hope we see the excellent results in future videos.
Make a specific compartment that is much smaller than the wing so it only works as a beam that doesnt have the ability to reshape the wing when expanding! :)
There is stuff called pour foam. It is much cheaper and easier to work with. There is a guy in Australia that uses it to harden his composite race car doors. I would share his name but I can't find it for the life of me.
Thanks for the suggestion! I thought of that during the making of this video, however i decided against since i wished to make a design where 3D-print times were kept to a minimum. I have however already some other good ideas, that are quite similar to your suggestion, and i'll report back in a followup video at some point!
@@TurboSunShine Yeah, I could imagine a few ways to accomplish that without printing a full-blown larger airfoil. I'm definitely curious to see what you'll come up with. +1 sub
What about print with 5% infill in lines. I think will hold better. Another option is to have an externa extructure that holds everything in place but more for producing many units of the same. 😅
Ditto here, try perhaps as two D tubes D for the leading edge and a V closed to glue to the D section in front. Could also use this idea to have multiple "tubes" to then glue together...thinking here of Warren truss ribs if you see what I mean..D in front and several triangle tubes to assemble to that. This may be easier to fill with foam...you could also make multiple vase tubs across the chord, foam fill and then assemble like large ribs together...mmm may still need a spar for spanwise rigidity..Rgds Laurie New Zealand
if you filled the wing shape with styrofoam beads, and then poured some watered down white glue on top of the beads (letting it drain out the bottom) I think it would do most of what you are aiming for.
Hi, I am printing a model from 3dlabprint but it has internal support but it still does not look strong to me as I am used for foam models with a spar, I plan to tack/hot glue a carbon spar in place in the centre of the wing then add expanding foam from the centre out lay by layer to prevent gaps, this I hope will give the best of both carbon and foam for strength.
I wonder if you printed the airfoil and then a second slightly smaller that would slide inside the first and use a glue that has small gap filling ability and glued the layers together. Maybe liquid PL?. Hmm I wonder if a bead on the leading edge of regular PL would add enough strength?
you can print another layer of outer shell that’s much thicker to hold the inner shell in place
Place the airfoil in sand in a box before injection of foam.
You should look at a 2 part urethane foam.They make prop weapons with it. My model shop uses Smooth-On products like Foam-IT.
You can get foams in a ton of different expansion rates that pour like liquid.
Thanks for the suggestion! I have used foam-it with other (school)projects, but sadly its not really readily available in hardware stores and such, and I wanted something that anyone could do at home. Also, not sure if it would avoid the "expansion of the wing", maybe it would be less dramatic if i use a slowly expanding foam?
Thanks!
-SunShine
Hi Sir, i remember years ago i replaced a plywood floor in a boat i think i drilled holes and used a 2 part foam..is this basically what you are talking about? I am 3d printing some 12 inch statues in vase mode...thinking if i could drill hole in bottom and pour approx 1 once or less and it should fill model and excess will come out of hole without expanding the sculpture...or maybe even the foam in can would work fine also this way...just don't want to drill holes in top just bottom..Any thoughts thanks for your comment
Here in comments are many viable suggestions. The foam hardens by absorbing moisture actually, therefore you can splash inner surface with water so as inner shell harden faster. And in the hollow part, the rod of some squashable material can be placed to mitigate the foam expansion. I hope we see the excellent results in future videos.
Make a specific compartment that is much smaller than the wing so it only works as a beam that doesnt have the ability to reshape the wing when expanding! :)
Put the airfoil in a clamp so it’s expansion is resisted. If it still deforms, build a wooden jig with the correct airfoil cross-section.
Print a few "stretch supports", that KEEP the FOIL RIGID. You only need a few 😃
There is stuff called pour foam. It is much cheaper and easier to work with. There is a guy in Australia that uses it to harden his composite race car doors. I would share his name but I can't find it for the life of me.
I'd like to see you try again with a separate second stronger printed piece surrounding/constraining the airfoil.
Thanks for the suggestion! I thought of that during the making of this video, however i decided against since i wished to make a design where 3D-print times were kept to a minimum. I have however already some other good ideas, that are quite similar to your suggestion, and i'll report back in a followup video at some point!
@@TurboSunShine Yeah, I could imagine a few ways to accomplish that without printing a full-blown larger airfoil. I'm definitely curious to see what you'll come up with. +1 sub
@@lawlawlo Thanks for the sub! :)
What about print with 5% infill in lines. I think will hold better. Another option is to have an externa extructure that holds everything in place but more for producing many units of the same. 😅
if you have a Foam gun you will get much more control with the metal nozzle insteadof a plastic straw. they go for under 10 US$
Could you print them with some bridge's inside to stop the foam deforming the shape
I have tried doing that, but i ended up having issues printing it in vase mode. but i might re-visit this idea at some point :)
Ditto here, try perhaps as two D tubes D for the leading edge and a V closed to glue to the D section in front. Could also use this idea to have multiple "tubes" to then glue together...thinking here of Warren truss ribs if you see what I mean..D in front and several triangle tubes to assemble to that. This may be easier to fill with foam...you could also make multiple vase tubs across the chord, foam fill and then assemble like large ribs together...mmm may still need a spar for spanwise rigidity..Rgds Laurie New Zealand
if you filled the wing shape with styrofoam beads, and then poured some watered down white glue on top of the beads (letting it drain out the bottom) I think it would do most of what you are aiming for.
make neg mold of the wing foil to clamp it ? to keep the shape under expatiation then crashing a plane with proven flight will be repeatable repairs
Hi, I am printing a model from 3dlabprint but it has internal support but it still does not look strong to me as I am used for foam models with a spar, I plan to tack/hot glue a carbon spar in place in the centre of the wing then add expanding foam from the centre out lay by layer to prevent gaps, this I hope will give the best of both carbon and foam for strength.
maybe use the less expanding kind like they use to place doors and windows
Yes, industrial grade coom.
I wonder if you printed the airfoil and then a second slightly smaller that would slide inside the first and use a glue that has small gap filling ability and glued the layers together. Maybe liquid PL?. Hmm I wonder if a bead on the leading edge of regular PL would add enough strength?
Why glue when they can be printed together? :)
Anyone have success filling statues printed in vase mode? maybe use something else...want to keep it lite weight...thanks!
Would it help to place the foam in a vacuum chamber before it is hardened? The final foam will be less dense and less excess pressure can build up.
printe noen få interne stag for å holde på formen?
Er en av mulighetene som jeg har planlagt å prøve!