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FTFC20 SPAD XIII designed by Zephyr1

Zephyr1

Well-known member
#1
My entry into this challenge will be a Spad XIII. The initial plans call for a 30in wingspan, and that's what I am going to be doing initially. However I do plan on scaling it up to near a 40in wingspan in line with Ben's PT-17. I usually design a lot of EDFs, so it will be fun to do something new.

IMG_9769.JPG


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Here are the plans:
https://aerofred.com/details.php?image_id=90989

My initial plans have already been made and the 30in prototype has already been cut out, so its possible I will have a maiden as soon as this weekend!
 
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#9
That's pretty nice.

Edit: Actually that's really, really nice. Makes me feel bad getting all critical in the next paragraph. That said the Spad XII has been on my list for quite some time and I did a whole lot of research on the plane, took lots of photos at the Dayton Museum, so while my gripes are really, really minor I can't help but offer my opinion.

Very cool use of the box frame with the skin over formers.
Maybe it's a little too round, though... have you thought of gluing the skin directly to the side walls and only doing formers for the top and bottom? Maybe score the inside of the skin to get a bit more of a crisp line between the straightish side walls and the rounded top and bottom.
Also, I have a feeling you will have to enlarge the tail surfaces to make it fly straight.

I don't want to come across as nitpicky. This is a gorgeous airplane as is. I just think it might get that little bit closer to the original if the fuselage sides were a bit better defined.
 
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Zephyr1

Well-known member
#12
That's pretty nice.

Edit: Actually that's really, really nice. Makes me feel bad getting all critical in the next paragraph. That said the Spad XII has been on my list for quite some time and I did a whole lot of research on the plane, took lots of photos at the Dayton Museum, so while my gripes are really, really minor I can't help but offer my opinion.

Very cool use of the box frame with the skin over formers.
Maybe it's a little too round, though... have you thought of gluing the skin directly to the side walls and only doing formers for the top and bottom? Maybe score the inside of the skin to get a bit more of a crisp line between the straightish side walls and the rounded top and bottom.
Also, I have a feeling you will have to enlarge the tail surfaces to make it fly straight.

I don't want to come across as nitpicky. This is a gorgeous airplane as is. I just think it might get that little bit closer to the original if the fuselage sides were a bit better defined.

Thanks for the edit lol. I'm not going to be only putting formers on the top and bottom, I did consider that though. This was very much just a prototype plane. I wanted to see how the skin would fit together over my formers and the answer was not very well. So that will be worked out for the second version. And yeah, the tail is gonna be 115% minimum on the next one.
 
#16
Thanks for the edit lol. I'm not going to be only putting formers on the top and bottom, I did consider that though. This was very much just a prototype plane. I wanted to see how the skin would fit together over my formers and the answer was not very well. So that will be worked out for the second version. And yeah, the tail is gonna be 115% minimum on the next one.
I just wanted to make sure I don't offend you. English is not my first language so I'm not always sure if I don't come across as negative...

I may also be culturally impaired because in Francnia, which is my home region there is a saying we live by:
"Ned gschimpft ist z'vill globt"
"Nicht geschimpft ist zu viel des Lobes" in plain german which roughly translates to "Not complaining is more praise than anyone deserves"

Well, the old folks at least tend to live by it and sometimes I feel like I'm getting old as well.
 

Zephyr1

Well-known member
#18
She looks great! Very nicely done on the curves! :D

Since you're planning on doing larger wingspan versions as well, seeing how the wing loading and her flight characteristics change between the versions would be very interesting. There's a simple wing loading calculator that I use over here: http://www.flyrc.com/wing-load-calculator/
Thanks rockyboy! I actualy have an excel file that calculates all my flight calculations for me, lol. Turns out I do have some HW that has practical use