Logo
Builders' Plan Gallery  |  Hip Pocket Web Site  |  Contact Forum Admin  |  Contact Global Moderator
December 11, 2019, 01:55:55 AM *
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with email, password and session length
 
Home Help Search Login Register
Pages: 1 [2]   Go Down
Print
Author Topic: Sandy Pimenoff's Number 18  (Read 2558 times)
0 Members and 1 Guest are viewing this topic.
Tapio Linkosalo
Platinum Member
******

Kudos: 28
Offline Offline

Finland Finland

Posts: 1,183



Ignore
« Reply #25 on: August 22, 2014, 11:37:07 AM »

The drawing does not indicate the angles, but the attached picture suggest the angles, and the article says "the decalage should be 2 to 3 degrees as in picture 54, the final value is established during trimming."

About rudder, the article says that "the rudeer should be built-up instead of sheet, to avoid warping."

To me it seems that the spars are inset into the ribs, and the riblets have a flange coming over the spar.


 
Attached files Thumbnail(s):
Re: Sandy Pimenoff's Number 18
Logged
mick66
Gold Member
*****

Kudos: 10
Offline Offline

United Kingdom United Kingdom

Posts: 298



Ignore
« Reply #26 on: August 22, 2014, 12:17:23 PM »

Hi

looking at my trimming notes ... all angles wrt bottom of fuse.

CG:                         83%
LeftThrust:             +1.5 degrees
DownThrust:           +2.0 degrees (as in down)
Wings:                    +3.0 degrees
Tail:                        +1.5 degrees (giving +1.5 decalage)
PRT tip washout:       +2mm
PRT inner panel:        flat
STB panel washin:    +2mm
STB tip washout:      +2mm

On the actual plan the rigging angles are Wing (+4 degrees) and Tail (+2 degrees).
I've trimmed it out at little under ... +1.5 degrees as noted above.

Tip washout measured at TE behind last rib.

Cheers

Mike

Logged
Starduster
Platinum Member
******

Kudos: 34
Offline Offline

United States United States

Posts: 1,351


Topic starter


Ignore
« Reply #27 on: August 22, 2014, 12:38:28 PM »

Gentlemen:

Thanks for all the help.

Thanks also to the power of "parametric" 3D modeling, it took me all of about 5 minutes to change the diagonals, see attached.

Attached files Thumbnail(s):
Re: Sandy Pimenoff's Number 18
Logged

"We have done the impossible, and that makes us mighty..."
hastf1b
Gold Member
*****

Kudos: 11
Offline Offline

Germany Germany

Posts: 385


Winding my Tilka during the german chamionship `87



Ignore
« Reply #28 on: August 22, 2014, 02:58:35 PM »

Sandy Pimenoff with "Ascender".

Heinz
Attached files Thumbnail(s):
Re: Sandy Pimenoff's Number 18
Re: Sandy Pimenoff's Number 18
Logged

F1B is o.k.
Tapio Linkosalo
Platinum Member
******

Kudos: 28
Offline Offline

Finland Finland

Posts: 1,183



Ignore
« Reply #29 on: August 22, 2014, 11:04:38 PM »

Different tailplane!
Logged
john thompson
Bronze Member
***

Kudos: 4
Offline Offline

United Kingdom United Kingdom

Posts: 66



Ignore
« Reply #30 on: August 23, 2014, 04:19:32 AM »

Zaic 59/61 , shows 2 versions No; 18 and the Ascender , 18 had rectangler tailplane .
My set up is 82 % cg ,+3.8 wing +2.3 tail . 4 down 1.5 left  ( these are approximate but as measured with a digital gadget ) . No warps except both tips washout by about 1.5 . Power Oliver Tigre replica 9x 5 Master about 12 k . Model flies beautifully, nice spiral, A/R not really needed . Dihedral is on low side for windy UK weather .
I have tried with more power without success ,( the problem I believe,  lies with the wing section having the undercamber starting immediately from the LE ) the model being extremely erratic in pattern and unreliable . I have built another wing with this section for another model and had same erratic pattern . On other models where this apparent problem has arisen , I have covered in the bottom of wing to make a flat bottomed section and the problem has gone away . So I must, with this limited testing assume that the undercamber was the problem , but with so many variables who knows ?
On page 47 of that Zaic is also shown, what I think is a rather good model !!
 All ready for the 2 days at Middle Wallop . Forecast fine Sunday, but rain Monday . At least I will (with others ) not be stuck on the gate this time, as we are not charging SAM 1066 entry fee this time , as we do not want to built up funds just sitting in the bank doing nothing . With a bit of luck we may get up to 150 or more freeflighters in attendance on the fine day . I suspect that there are not many places in the world where that number gather . lots of walking and hiking sticks on view from folks determined to have a go.
John 
Logged
hastf1b
Gold Member
*****

Kudos: 11
Offline Offline

Germany Germany

Posts: 385


Winding my Tilka during the german chamionship `87



Ignore
« Reply #31 on: August 23, 2014, 11:04:33 AM »

Different tailplane!

Hi Tapio, I have not written it is "Number 18". It is the "Ascender" like the left drawing in post # 8.

Heinz
Logged

F1B is o.k.
Red Buzzard
Silver Member
****

Kudos: 4
Offline Offline

United States United States

Posts: 126



Ignore
« Reply #32 on: August 27, 2014, 02:45:19 PM »

John T. in #18 above,

Okay, I'll bite. Two questions: Are plans available and why "Zimbabwe". I've looked at the drawing numerous times and never quite figured out why the name.

You are correct. Nice proportions, flat bottomed stab, and could build fairly light for duty in both Nos A and Vintage FAI with a bit of ballast. Interesting.

Bill
Logged
Starduster
Platinum Member
******

Kudos: 34
Offline Offline

United States United States

Posts: 1,351


Topic starter


Ignore
« Reply #33 on: September 05, 2014, 09:25:23 AM »

Tapio:

Quick question:

In the scanned image of the drawing from your book (post #22), can you take a look and tell me the dimension that is from the trailing edge of the wing to the leading edge of the stab? The dimension in the image is right on the fold, and I can't make it out.

Thanks

Rich

Attached files Thumbnail(s):
Re: Sandy Pimenoff's Number 18
Logged

"We have done the impossible, and that makes us mighty..."
Brian J Y
Bronze Member
***

Kudos: 0
Offline Offline

United Kingdom United Kingdom

Posts: 72



Ignore
« Reply #34 on: September 06, 2014, 02:41:57 PM »

Hi Rich,

If it's of any use the Zaic yearbook gives 600mm for the Ascender & 629mm for Number 18.

Brian
Logged
mick66
Gold Member
*****

Kudos: 10
Offline Offline

United Kingdom United Kingdom

Posts: 298



Ignore
« Reply #35 on: September 07, 2014, 02:21:54 AM »

Hi

the plan I have ... which is the one in the book ...  says 628mm for the #18.

Cheers

Mike
Logged
glidermaster
Gold Member
*****

Kudos: 19
Offline Offline

Canada Canada

Posts: 861




Ignore
« Reply #36 on: September 09, 2014, 10:09:53 PM »

What's a single millimetre between friends?
Sorry, 40 thou!
Logged

Gliders are a part of me.
Tapio Linkosalo
Platinum Member
******

Kudos: 28
Offline Offline

Finland Finland

Posts: 1,183



Ignore
« Reply #37 on: November 06, 2014, 05:40:51 AM »

Five years ago we had a meeting at the Finnish Aviation Museum (next to the Helsinki Airport), where some previous World Champions were presenting their models. Mr Sandy Pimenoff among them. Pentti Reinas took the attached photo of Sandy presenting his model. I think the model currently is at the museum.

 
Attached files Thumbnail(s):
Re: Sandy Pimenoff's Number 18
Logged
Tapio Linkosalo
Platinum Member
******

Kudos: 28
Offline Offline

Finland Finland

Posts: 1,183



Ignore
« Reply #38 on: November 14, 2014, 07:18:26 AM »

Inspired by this thread, I also launched my CorelDraw and imported one of the digitized drawings to it. Here in Finland we do not fly vintage power (nor much of any power), but I felt like the #18 might be an interesting subject for E-36, thus I reduced the size down to 36 in span. Next I would need to send the patterns for laser cutting... I have not figured out the nose length yet, but plan to cut the nose to final length with semi-assembled model, motor and battery in place. I suppose Mick's notes for angles and CG location would be a good starting point.
Attached files Thumbnail(s):
Re: Sandy Pimenoff's Number 18
Logged
FF Bruce
Gold Member
*****

Kudos: 13
Offline Offline

United States United States

Posts: 485



Ignore
« Reply #39 on: November 14, 2014, 08:18:29 PM »

Tapio,very nice should work well.I've done the same thing but with the Eros FAI model from the late 60's
Logged
Tapio Linkosalo
Platinum Member
******

Kudos: 28
Offline Offline

Finland Finland

Posts: 1,183



Ignore
« Reply #40 on: April 12, 2015, 05:55:47 AM »

I met Sandy yesterday in a model fair here in Helsinki, and asked about the different versions. He told me that the two models were otherwise similar, but "Ascender" had the rectangular tailplane, while #18 sported the elliptical one. He said he used them both at the World Champs, started with Ascender, but at some round was timed an over-run (with big difference in the times of the two timekeepers), and had to fly #18 for that round and then sticked to the latter for the rest of the contest. #18 was called that as it (or he) made 18 maxes in the competition (counting in that one over-run).
Logged
Pages: 1 [2]   Go Up
Print
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines Valid XHTML 1.0! Valid CSS!