Hi fellow builders of wooden gliders,
I have been given a pair of wings for the Phoenix Models Ka8 1:2.5 scale or should that be semi scale model. The owner of the wing is not in a position to rebuild the plane after its demise.
I would like to make a fuselage to go with this wing, but I cannot find a 1:2.5 scale plan. But I do have a 1:3.5 scale plan that is very detailed which I have enlarged up to 1:2.5.
There are a few question that I would like to ask.
1. What are your thoughts regarding the new versions of the wings. Are they worth investing time and money building a fus for them. And if the answer is yes, then I would like to ask what I need to scale on the plan in the way of wood sizes
2. On the plan the longerons are marked as 8 mm sq but scale as 10mm sq. To me, 10 mm looks about right. What are your thoughts. Should I make them 10mm or will 8 mm be strong enough? Silmilarly the 5mm struts and braces might need to be 6 and 8 respectively.
The the foil on the new Phoenix wings are HQ..at 15% thick. What should the incidence be? 1.5°?
Look forward to you thoughts
Stuart
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Phoenix Ka8 rebuild
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- Posts: 88
- Joined: 18 Mar 2015, 23:33
- Location: USA
Re: Phoenix Ka8 rebuild
Unless you’re willing to “rebuild” the wings also I wouldn’t bother........the “new” version of the wings still has no real spar.....the factory added an aluminum tube in the middle of the D-box that goes out about 3/4 of the length of the main panels. The only correct “fix” is to strip the wings and add wood spar caps with shear webbing. Here is how I fixed the “spar” issue.....
https://www.rcgroups.com/forums/showthr ... tion/page1
https://www.rcgroups.com/forums/showthr ... tion/page1
- Stuart Ward
- Posts: 80
- Joined: 21 Mar 2015, 18:23
- Location: Pukekohe NZ
Re: Phoenix Ka8 rebuild
Hi Tom, I had a look through your RC groups thread. That's a great resource. Thanks for posting.
It's well worth adding the spars in the fashion that you suggest if the project goes ahead.
Just a note on the crashed one in the first photo that I posted, the root cause was the carbon tube joiner on one of the wing tip panels failed. I believe that most other owners of this model had replaced them with solid carbon rod. I'm not sure why he didn't.
Tom , what are you using for he centre wing joiners?
Stu
It's well worth adding the spars in the fashion that you suggest if the project goes ahead.
Just a note on the crashed one in the first photo that I posted, the root cause was the carbon tube joiner on one of the wing tip panels failed. I believe that most other owners of this model had replaced them with solid carbon rod. I'm not sure why he didn't.
Tom , what are you using for he centre wing joiners?
Stu
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- Posts: 88
- Joined: 18 Mar 2015, 23:33
- Location: USA
Re: Phoenix Ka8 rebuild
Stu.......mine uses solid carbon rods for the outer panel joiners and I’m using the supplied aluminum joiner tubes for the main joiners at the fuse........Stuart Ward wrote: ↑23 Mar 2019, 18:06 Hi Tom, I had a look through your RC groups thread. That's a great resource. Thanks for posting.
It's well worth adding the spars in the fashion that you suggest if the project goes ahead.
Just a note on the crashed one in the first photo that I posted, the root cause was the carbon tube joiner on one of the wing tip panels failed. I believe that most other owners of this model had replaced them with solid carbon rod. I'm not sure why he didn't.
Tom , what are you using for he centre wing joiners?
Stu