Nemesis NXT Turboprop in foamboard!

[OliverW]

Now that I have figured out how to actually make decent-ish planes, I thought it would be a good idea to stuff an old B-Pack in this thing and just cruise and go fastish. The plan is a 26" Wingspan. And do you guys have any idea on how to make the exhaust on this? Here is the 3-view I am using.

 

[Paracodespoder]

For the exhaust, stack a few layers of foam and then sand them to shape. I like the lines on this one, if you put out plans I will definitely build one, good luck .

 

[rmikebaker]

Another option would be to 3D-print them. While it wouldn't work for everybody, might be a nice option. Wouldn't be hard to design. I could put something together if you're interested.

 

[OliverW]

For the exhaust, stack a few layers of foam and then sand them to shape. I like the lines on this one, if you put out plans I will definitely build one, good luck .

Hoping for plans to be out. Depends on the level of sketchyness that it will have. I might do an FT style build.

 

[OliverW]

Another option would be to 3D-print them. While it wouldn't work for everybody, might be a nice option. Wouldn't be hard to design. I could put something together if you're interested.

I would love that. I will throw together plans, maiden it and see what happens first.

 

[Samh]

@SquirrelTail... Did you remember your in H. Can i make a version of plans😉

 

[OliverW]

@SquirrelTail... Did you remember your in H. Can i make a version of plans😉

Sure. We will have a build off with the end of the time being in 2 months

 

[mayan]

For the exhaust, stack a few layers of foam and then sand them to shape. I like the lines on this one, if you put out plans I will definitely build one, good luck .

I second this and also hope you put out plans FT style so I can build one too.

 

[OliverW]

Ugh. AutoCAD will not let me do an angle less than 5 degrees for the fuselage shape. Any tips?

 

[Horseman3381]

Ugh. AutoCAD will not let me do an angle less than 5 degrees for the fuselage shape. Any tips?

Autocad can do angles up to basicaly an infinite number of decimal places. At least I'm my experience I remember have used up to .0001 before (for work, not plane plans). What do you mean by it wont let you do an angle less than 5 degrees? Do you maybe have the polar setting on that snaps to 5 degree incriment angles? Or are you attempting to rotate a line and it wont take inputs of less than 5 degrees? You could also have the dimension tolarances set so it will only display an angle in 5 degree increments even though it could be drawn as something imbetween.

If you could give a little more info on the issue you are having hopefully we can figure out what is up.

 

[OliverW]

Autocad can do angles up to basicaly an infinite number of decimal places. At least I'm my experience I remember have used up to .0001 before (for work, not plane plans). What do you mean by it wont let you do an angle less than 5 degrees? Do you maybe have the polar setting on that snaps to 5 degree incriment angles? Or are you attempting to rotate a line and it wont take inputs of less than 5 degrees? You could also have the dimension tolarances set so it will only display an angle in 5 degree increments even though it could be drawn as something imbetween.

If you could give a little more info on the issue you are having hopefully we can figure out what is up.

Ok. Thanks. It only will let me do 5 degrees of angle or it will snap back to level.

 

[Horseman3381]

Ok. Thanks. It only will let me do 5 degrees of angle or it will snap back to level.

If that is the case then you likely have the polar setting on. You can hit F10 to turn it off. Also make sure you don't accidentally turn ortho on (F8) or else you will be snapping to 90 degree increments.

Depending on what version of AutoCAD you have there is a tool bar in the lower right side of the screen where you can adjust the settings and toggle them on and off as well.

If that doesn't work let me know and I can look further into it.

 

[OliverW]

I am stuck on how to make a cowl! I am thinking I might have to buy an inrunner for it...

 

[DamoRC]

You could make the cowl a removable piece that gets added once the motor is installed. This is what I did for the Gee Bee R3, the cowl was too narrow for the motor, so I just attached it after the motor was mounted.

 

[OliverW]

You could make the cowl a removable piece that gets added once the motor is installed. This is what I did for the Gee Bee R3, the cowl was too narrow for the motor, so I just attached it after the motor was mounted.

View attachment 122921

I like the idea! The problem is the cowl on this one has such a different shape.

 

[Mad_Mechanic]

@SquirrelTail - Just thought I might chime in with some ideas for the exhaust pipes.

In the spirit of cheap, commonly available materials, what about using cardboard tube (like the middle of a paper towel roll) or perhaps some thin wall PVC pipe (like Schedule 10 or schedule 20 PVC)?

I've read/heard that with careful application of heat you can make PVC pipe pliable enough to form/bend and work with.

Just some ideas.

Really like what you are doing and the build is looking great so far!

 

[OliverW]

@SquirrelTail - Just thought I might chime in with some ideas for the exhaust pipes.

In the spirit of cheap, commonly available materials, what about using cardboard tube (like the middle of a paper towel roll) or perhaps some thin wall PVC pipe (like Schedule 10 or schedule 20 PVC)?

I've read/heard that with careful application of heat you can make PVC pipe pliable enough to form/bend and work with.

Just some ideas.

Really like what you are doing and the build is looking great so far!

I like that idea with the toilet paper tubes!!! I will do that. I can't figure out how to get that beautiful round cowl shape..

 

[Paracodespoder]

@SquirrelTail - Just thought I might chime in with some ideas for the exhaust pipes.

In the spirit of cheap, commonly available materials, what about using cardboard tube (like the middle of a paper towel roll) or perhaps some thin wall PVC pipe (like Schedule 10 or schedule 20 PVC)?

I've read/heard that with careful application of heat you can make PVC pipe pliable enough to form/bend and work with.

Just some ideas.

Really like what you are doing and the build is looking great so far!

Yup, pvc is very easy to work with if you have a heat gun, easy enough you can make a nice pvc recurve bow in under an hour .

 

[DamoRC]

I like that idea with the toilet paper tubes!!! I will do that. I can't figure out how to get that beautiful round cowl shape..

It's hard to say without seeing what your current plans look like. Here is a quick mockup of the front of the plane based on your dimensions (26 inch wingspan, B-pack motor). There seems to be plenty of room to mount the motor such that the prop matches the base of the spinner (not sure if you were planning on adding a scale spinner to the motor). You could use foamboard with the paper removed from the inside and two formers to produce the round shape - kinda like the approach Alex took with the Fortnite Plane.
Note that at this scale the exhausts are just over 1/2 inch diameter so a toilet roll insert might be a little on the large side (you could cut it down and re-roll it I suppose).

Any pics of your current AutoCAD model?

 

[OliverW]

It's hard to say without seeing what your current plans look like. Here is a quick mockup of the front of the plane based on your dimensions (26 inch wingspan, B-pack motor). There seems to be plenty of room to mount the motor such that the prop matches the base of the spinner (not sure if you were planning on adding a scale spinner to the motor). You could use foamboard with the paper removed from the inside and two formers to produce the round shape - kinda like the approach Alex took with the Fortnite Plane.
Note that at this scale the exhausts are just over 1/2 inch diameter so a toilet roll insert might be a little on the large side (you could cut it down and re-roll it I suppose).

View attachment 124030

Any pics of your current AutoCAD model?

That looks amazing! I am not sure what happened to the drawing. I had the wings and the fuse almost done. I will try to get new plans started in a bit.