CARBON FIBER DISCUSSION

[Zoom Master]

Your best bet might be to use a hot wire cut compression mold. The wing should have a foam core regardless for weight reasons, and by hot wire cutting you get both the female and male sides of the mold. You can bondo and sand the female halves of the mold then paint it with primer and a release agent to make something that will give you a good surface finish. Then you wrap the male side in CF cloth with resin and put it back into the female mold and put a bunch of weight on top of it to force out the excess resin. Not as good as vacuum bagging it but a lot easier and it doesn't require equipment beyond a hot wire cutter which is very easy to make. So, the foam block would end up being cut something like this.
View attachment 251990
Mylar security blanks can make a good release film which gives a very shiny surface with fiber glass (you wrap this around the lay up before putting it in the female mold instead of using PVA or similar) but I haven't tried with carbon fiber. You also have to watch out to make sure the resin you're using won't melt the foam you're using.

It's also probably a good idea to build whatever design in foam board or even to 3D print it since you've got the fusion files before starting on the composite one. Means you can catch the issues early and not after spending 10s of hours on a lay up.

That’s some good advice and I was thinking the same thing just saw a video of someone doing this and that’s the route I’m gonna go and fist I’m gonna build it out of foam board to see if there are any issues with the frame and if there are I can fix them. Here is a video of someone making a speeding out of fiberglass using foam

and as for a wire cutter I already have one.

 

[Zoom Master]

That’s some good advice and I was thinking the same thing just saw a video of someone doing this and that’s the route I’m gonna go and fist I’m gonna build it out of foam board to see if there are any issues with the frame and if there are I can fix them. Here is a video of someone making a speeding out of fiberglass using foam

and as for a wire cutter I already have one.

I will have foam core wings but the whole body will be hallow.

 

[Zoom Master]

Here is the difference between my 2 designs

My new deisgn View attachment 251987

and my old design
View attachment 251988

For this one im gonna redesign the whole fuselage and for my newer carbon design im gonna add wing mounts so it can be made of foam board aswell.

 

[Piotrsko]

Jeez louise, miss a day........

Foamboard should be able to do 300 with enough engineering, but it has basic issues like repeatability and no good fast easy way to have a sharp edge that is consistantly even. Everything else is lack of good design. Jury is out whether or not you need sharp edges if you have enough thrust.

Fwiw: have not ever guaranteed I broke the sound barrier, even with some of the rockets I built.

 

[Zoom Master]

Jeez louise, miss a day........

Foamboard should be able to do 300 with enough engineering, but it has basic issues like repeatability and no good fast easy way to have a sharp edge that is consistantly even. Everything else is lack of good design. Jury is out whether or not you need sharp edges if you have enough thrust.

Fwiw: have not ever guaranteed I broke the sound barrier, even with some of the rockets I built.

U would be surprised how chronically online Me and some other people are. I like to post something everyday on here no matter what it is and I guess u are correct but why would one try to make foamboard go 300 mph when u can just build a carbon plane that can handle 300 mph and more with a quarter of the effort and I guess I do have enough thrust but what would u say is enough thrust ? My motor can produce somewhere from 5-6 kg thrust.....

 

[Zoom Master]

Jeez louise, miss a day........

Foamboard should be able to do 300 with enough engineering, but it has basic issues like repeatability and no good fast easy way to have a sharp edge that is consistantly even. Everything else is lack of good design. Jury is out whether or not you need sharp edges if you have enough thrust.

Fwiw: have not ever guaranteed I broke the sound barrier, even with some of the rockets I built.

And all I hear u saying it's possible........And with sharp edges a good design and with a powerful enough motor u can reach 300 mph or at the very least come very close..........I think I might be the perfect person to do this I have the recources and time to be able to do this and I can easily get my hands on a EXTREMELY powerful motor.

 

[Zoom Master]

Jeez louise, miss a day........

Foamboard should be able to do 300 with enough engineering, but it has basic issues like repeatability and no good fast easy way to have a sharp edge that is consistantly even. Everything else is lack of good design. Jury is out whether or not you need sharp edges if you have enough thrust.

Fwiw: have not ever guaranteed I broke the sound barrier, even with some of the rockets I built.

And im also trying to speedrun to legendary member.......

 

[telnar1236]

U would be surprised how chronically online Me and some other people are. I like to post something everyday on here no matter what it is and I guess u are correct but why would one try to make foamboard go 300 mph when u can just build a carbon plane that can handle 300 mph and more with a quarter of the effort and I guess I do have enough thrust but what would u say is enough thrust ? My motor can produce somewhere from 5-6 kg thrust.....

You might be underestimating the effort to make a CF plane - I have never built anything even close to that fast but I have made partially composite designs before and it is a ton of work. A foam board plane might take a few weeks to build even if it's a ridiculously complicated design but you're looking at months of work minimum to build with a composite plane.
The good news is, now that you have a basic planform, you should be ready to start at least making some chuck gliders and maybe even some powered airframes to start testing to see if what you have will work.

 

[Zoom Master]

You might be underestimating the effort to make a CF plane - I have never built anything even close to that fast but I have made partially composite designs before and it is a ton of work. A foam board plane might take a few weeks to build even if it's a ridiculously complicated design but you're looking at months of work minimum to build with a composite plane.
The good news is, now that you have a basic planform, you should be ready to start at least making some chuck gliders and maybe even some powered airframes to start testing to see if what you have will work.

True I never said it was a walk in the park it might have seemed like it by the way I was talking in the thread but im well aware it is a pain to make CF planes rather than foamboard planes.

 

[Houndpup Rc]

Jeez louise, miss a day........

I know right?! 🤣 🤣

 

[Zoom Master]

True I never said it was a walk in the park it might have seemed like it by the way I was talking in the thread but im well aware it is a pain to make CF planes rather than foamboard planes.

Here is a video of someone using foam to build a carbon airplane like im planning to....

 

[Zoom Master]

I know right?! 🤣 🤣

............

 

[Houndpup Rc]

............

?

 

[Zoom Master]

?

Nothing don’t worry about it 😆

 

[Mr Man]

Nothing don’t worry about it 😆

Too late, now my curiosity has been sparked…

 

[Zoom Master]

Too late, now my curiosity has been sparked…

Well that’s to bad 😃

 

[Mr Man]

Well that’s to bad 😃

🤣 😂 😂

 

[Zoom Master]

Just saw this video of a hjk speedwing elysium with a turbine

Im pretty sure the plane in the video went 300 mph but Im not sure is there any way to find out the real speed of objects in a video ? I heard there are...........

 

[Zoom Master]

Jeez louise, miss a day........

Foamboard should be able to do 300 with enough engineering, but it has basic issues like repeatability and no good fast easy way to have a sharp edge that is consistantly even. Everything else is lack of good design. Jury is out whether or not you need sharp edges if you have enough thrust.

Fwiw: have not ever guaranteed I broke the sound barrier, even with some of the rockets I built.

Ok let's say I make a perfect foamboard airplane...........the dream im talking perfect sharp edges completely even, Super aerodynamic design and a motor able to propel the airplane to 300 mph or faster. Question is what will hold the foam board together at that speed ? Wont glue start to melt at that temp although I dont know what temp my airplane will reach but lets say it reaches at the melting point of hot glue........what then ?

 

[Mr Man]

Ok let's say I make a perfect foamboard airplane...........the dream im talking perfect sharp edges completely even, Super aerodynamic design and a motor able to propel the airplane to 300 mph or faster. Question is what will hold the foam board together at that speed ? Wont glue start to melt at that temp although I dont know what temp my airplane will reach but lets say it reaches at the melting point of hot glue........what then ?

Use gorilla glue like @DamoRC does.