Foamboard F-22 EDF

[Firestar119]

It flies but that's about it, no straight vertical and limited high alpha due to the weight

working on the paint job at the moment

 

[Houndpup Rc]

It flies but that's about it, no straight vertical and limited high alpha due to the weight View attachment 252774
working on the paint job at the moment

Nice! I am glad it at least flew for you!

 

[Firestar119]

Nice! I am glad it at least flew for you!

It flew but it doesn't really do justice to its real life counterpart

 

[Firestar119]

I could somehow try to fit 2 64's in the airframe but that's sketchy

 

[Houndpup Rc]

It flew but it doesn't really do justice to its real life counterpart

Yeah, but mine didn't even fly! 😂 But I know what you mean

 

[cosmocop]

It flies but that's about it, no straight vertical and limited high alpha due to the weight View attachment 252774
working on the paint job at the moment

I built this as a 6s 70mm (single) and had similar results. I wonder how it would have done with paper removed. It flew "okay" but didn't have much speed or vertical. I think it could have done with more intake (I see you cut a cheater hole already). I tried reviving the idea by making the Jetworks version (paper removed) but I didn't scale it up. I included a cheater and it did have plenty of punch, but the wingloading was high. I'm currently making a 115% Jetworks version which should put it between the current Freewing 70mm size and the old LX single 70mm size. Hoping that gets me in the sweet spot.

 

[Firestar119]

I built this as a 6s 70mm (single) and had similar results. I wonder how it would have done with paper removed. It flew "okay" but didn't have much speed or vertical. I think it could have done with more intake (I see you cut a cheater hole already). I tried reviving the idea by making the Jetworks version (paper removed) but I didn't scale it up. I included a cheater and it did have plenty of punch, but the wingloading was high. I'm currently making a 115% Jetworks version which should put it between the current Freewing 70mm size and the old LX single 70mm size. Hoping that gets me in the sweet spot.

Not removing the paper was probably my biggest mistake

 

[Firestar119]

The markings are probably too dark

 

[bisco]

looks good to me!

 

[jzoidberg]

Has anyone tried to simplify the design by going to to a single exhaust? The split looks pretty streamline but there must be some amount of efficiency lost at the fork. Obviously the fuselage might not have enough depth, but could the outlet have an oval shape, and what does that do to thrust/eficiency? Gonna try to get these plans printed, I have a 50mm fan from a wrecked arrows viper and a 64mm ali edf kicking around. Might use the 64 in a bigger build.

 

[Houndpup Rc]

Has anyone tried to simplify the design by going to to a single exhaust? The split looks pretty streamline but there must be some amount of efficiency lost at the fork. Obviously the fuselage might not have enough depth, but could the outlet have an oval shape, and what does that do to thrust/eficiency? Gonna try to get these plans printed, I have a 50mm fan from a wrecked arrows viper and a 64mm ali edf kicking around. Might use the 64 in a bigger build.

I did...But I used a 64mm EDF thinking with the added power it wouldn't matter.... But the thrust was too limited so it didn't fly, though switching it from two to one, seemed to get better thrust 👍

 

[jzoidberg]

I did...But I used a 64mm EDF thinking with the added power it wouldn't matter.... But the thrust was too limited so it didn't fly, though switching it from two to one, seemed to get better thrust 👍

Do you think it was a weight issue or an air supply problem? Its a really cool plan id like to give it a try. Maybe I'll home brew something first.

 

[Houndpup Rc]

Do you think it was a weight issue or an air supply problem? Its a really cool plan id like to give it a try. Maybe I'll home brew something first.

I think the air was too restricted so it it didn't have enough thrust

 

[cosmocop]

Going to one outlet is probably going to improve thrust. The Jetworks version does this.

 

[jzoidberg]

If I were to do it, should i alter the aft fuselage to accommodate a single larger outlet, or would an oval shape still produce more thrust?

E.t.a. I will be printing a set of plans at staples tomorrow while I wait on tires getting mounted on my truck. I'm assuming I just give them the pdf and have them print it on a 24x36 blueprint sheet?

 

[cosmocop]

I'm pretty sure a round outlet will produce more thrust (not sure how much), but you'd sacrifice some aesthetics. The Jetworks version goes with an oval outlet and I think its a nice middle ground from going split outlet or a single round outlet.

 

[jzoidberg]

thanks cosmocop, plans are aquired. going away for the weekend holiday, but I'll probably start cutting next week. what's the best method of going about it? I was thinking glue the sheet right to the foam board, and cut through everything. I can peel the paper off the foam afterwards. I know mostly I should be keeping the paper on except where told to remove it, but id save a little more weight.

 

[Houndpup Rc]

thanks cosmocop, plans are aquired. going away for the weekend holiday, but I'll probably start cutting next week. what's the best method of going about it? I was thinking glue the sheet right to the foam board, and cut through everything. I can peel the paper off the foam afterwards. I know mostly I should be keeping the paper on except where told to remove it, but id save a little more weight.

I just tape the edges of the plans to the sheet of foam..I don't recommend gluing it or you will take off all the paper 6trying to get the plans off.

 

[jzoidberg]

I just tape the edges of the plans to the sheet of foam..I don't recommend gluing it or you will take off all the paper 6trying to get the plans off.

I was thinking less paper less weight? Looking through photos, I'm also thinking of leaving addition paper on the body panels. I'm thinking I could maybe overlap the additional paper over the prior panel, little bit of elmers glue to secure this lap joint. then again I could see if I'm hot gluing the joint between panels just making a mess out of everything hahaha.

First foamboard plane from a plan. Probably over my head hahaha.

 

[Firestar119]

thanks cosmocop, plans are aquired. going away for the weekend holiday, but I'll probably start cutting next week. what's the best method of going about it? I was thinking glue the sheet right to the foam board, and cut through everything. I can peel the paper off the foam afterwards. I know mostly I should be keeping the paper on except where told to remove it, but id save a little more weight.

I just use a thumbtack to poke holes at the vertices and then connect them with a straightedge