Our Newest Kit Addition *UPDATED*

[builditright]

Hi all,

Check out our post in the Vendors section for our newest kit addition.

http://stunthanger.com/smf/index.php?topic=23349.0

**UPDATED**
As requested by numerous modelers wanting the SAKITUMI kit

we have decided to extend the Ordering Cutoff date to October 15.

[Peter Nevai]

Looks to be a good standin for the up coming forerunner. Alas, can't swing the bean count till the middle of Oct. BTW (By the way, NOT Bring the Wheel Chair) The leading edge, does it have to be formed ala Foam BUC templates?

[PerttiMe]

Speaking about acronyms.... What does SAKITUMI stand for?

Nothing to do with TEOSAWKI

 

[dennis lipsett]

sock it to me...........laugh in 1966

[BYU]

The wing was originally built with a molded leading edge as I enjoy molding balsa and I have found it to be relatively easy as long as you get the balsa wet enough. (I leave it in a bath for 12 to 24 hours) The kit is designed to use a more conventional LE and top / bottom LE sheeting.

The name is derived from a 60’s TV show and was so named by Kim Mortimore.

[Allan Perret]

Hey Elliot, I didnt know you were a designer.
  
I have moulded a couple of wing LE's,  only soaked them for 15 min.  
Is this LE unusually tight radius?

The SAKITUMI reminds me of the TEOSAWKI, only with some style.

In some of the pictures it looks like it might be an inline design, is that right ?

[BYU]

Hi Alan

The SAKITUMI was inspired by three un-flapped designs; the Primary Force, the Doctor, and the TEOSAWKI. I always thought that the TEOSAWKI was a great design. It is particularly sad that no kit or ARF is any longer available. I used a TEOSAWKI and Primary Force for nearly 3 years and they helped me learn the pattern as well as win a number of contests. I retired my TEOSAWKI this year in memory of its designer, the late Clayton Smith who I have huge respect for, he designed and popularized a very clever design.

The SAKITUMI was designed to take the best of the unflapped planes I had flown and make a really great practice and intermediate plane. What I was really surprised by when I first flew it was how outstanding its performance was. If you were able to pick up the handle without knowledge that it didn't have flaps and fly it for the first time you wouldn't know it is a flapless design, it performs that well.

RE Design; I have worked on a few designs, the Cardinal Evolution is probably the most famous one I designed with Windy Urtnowski at my kitchen table 11+ years ago.
I didn't work completely alone on the design and drafting. John Miller was outstanding in his help with the early CAD drawings and his suggestion of a very effective airfoil was important, the design has a thick very forward high point airfoil, it is similar to the shape of full size Aerobatic planes airfoil. (Maybe John can add details here?)

The great things about profiles even for advanced and expert flyers is that they have a higher "expendability quotient", you feel like you have less invested in them as they don't take long to build, I believe this is why even simpler unflapped planes have a place in a more relaxed flying experience (at least for me).

RE the molded LE; Balsa molding can be very simple as long as you know to soak the wood thoroughly and I hear so many flyers say they cant make it work that the simplest tip I know is just "soak it a'while". Balsa really doesn't need 24 hours of soaking but I have found that if the wood is soaked cold it usually needs longer, and soaking longer also lowers the risks of splitting in my experience. The kit is designed to use a conventional leading-edge but there is no reason why you shouldn't mold one and have the effectiveness of a very consistent leading-edge shape just like the prototypes. The LE is in fact very blunt and not tight in radius at all.

Yes it is an inline design, I have no idea if it should work, it just does. I have read all the pluses and minuses on inline setups, all I know is that it works on this design with the light landing gear and an LA 46. Lighter or heavier engines, bigger or heavier wheels might well change that.

Overall I am very happy with the SAKITUMI, I hope a few other folks get to enjoy one.


Eliott

[John Miller]

Thanks Elliot for the kind words. When I saw the working plans you sent, It was easy to see this particular airfoil being used. Norm Whittle had engaged me in a discussion some time back where he spoke about Gordan's Pathfinger airfoil, and how some modern full sized aerobatic designs were using somethng very similar.

The airfoil was derived from the Pathfinder airfoil. I use a very good airfoil program and was able to adjust several parameters of that airfoil to arrive at what looked, to me, to be much closer to what the full sized planes were using.

I moved the high point to 14%, and used the airfoil with a 16% thickness. I named this particular airfoil BOS, after your originals design name. I figured that with the entry it had, as well as the forward high point, that it should perform well, and I'm pleased that you are happy.

The redesign you guys did on the fuselage is super looking, and makes the plane sparkle. I hope you guys sell a bunch of them.

[dennis lipsett]

John,
I don't know why but every time I look at the tip airfoil I'm reminded of a particular British combat job that I liked a long time ago. so long ago that i'm having a hard time remembering the name. But it will come to me soon i hope.
dennis
Dennis

[John Miller]

Dennis, I would be suprized if something very close hasn't already been used. You should see some of the airfoils in my coords files. There's almost every concievable variation availablesome where.

Seems to me, thinking about it, that one of Scarinzi's stunt designs had some thing similar. I think it might have been the Grey Ghost.

This style doesn't get used much, but with the right combinations, it appears to work quite well.

Edit: I just checked the Grey Ghost drawing, and there are similarities, but there's more curve in the back half of the airfoil. Still, lot's of similarities, esp. in light of the fact that the Grey Ghost is a non-flapped design also.

[builditright]

**UPDATED**
As requested by numerous modelers wanting the SAKITUMI kit

we have decided to extend the Ordering Cutoff date to October 15.



Electric version also available