IVL K.1 Kurki – peanut plan

If you check my last post (see here) you might notice that I sound overly enthusiastic of this ugly duckling. You are pretty right.. This is truly one of ugliest planes I have seen and it is also of finnish origin.

It was designed in 1927 by Asser Järvinen. He was employed by Finnish state aviation factory (IVL = Ilmavoimien Lentokonetehdas, directly translated airforce airplane factory..). Originally this plane was his pet project which he designed without permission. But the need for planes was so great that initial design got accepted as an official project.

Good intentions do great things, but not in this case. When plane was completed it turned out to be overweight and challenging to fly. For many reasons. There is an good wiki page for it. Strangely enough this is categorized as an military, transport & training plane.

After extensive testing, some 55 test flights it was concluded that it is of ‘no practical use’. Project was scrapped and only existing plane was stored for prosperity. That is museum. It ended up in Vesivehmaa museum where it was stored in sad condition. Check my previous visit there.

After while good people of Finnish Aviation museum decided to restore it and the end result is much nicer. But still it is ugly plane.

Well, that does one do when one encounters something so extraordinary? Obviously one must make model aeroplane out of it. I did some initial design drafts couple years ago. Then after new Kurki exhibition opened in decemeber 2018 at museum I decided to complete design. For several reasons I decided to make an peanut scale version of it.

So here it is for your viewing and building pleasure. Enjoy.

Click here to download plan.

I strongly propose that you visit Aviation Museum (Ilmailumuseo) to see this plane in it’s 1:1 glory. It is sight to see, and the  IVL Kurki special exhibition is open to end of january 2019. Nice place to visit in so many ways!

This plan has been released for free download. If you manage to make something out of it pls send me pics of that. I would love to hear whether it flies….

HowTo : Model aeroplane transport supports for light trailer

Here in Finland (and in many other Nordic & European countries) we have thing called light trailer. They are, as name states, light trailers for transporting things like sacks of gravel, soil, leaves, etc. Or lawn mover. Nice and handy, somewhat economical and come in different sizes. We have had numerous debates on what is The Best Way to use them for transporting your modelling stuff. Hopefully in one piece. This HowTo tries to explain one way to do it. There are numerous attempts, this just my humble way. It does have it’s merits as I’ll soon explain.

Before starting : get an trailer which has both leaf springs and shock absorbers. If you opt to buy cheaper model which has only leaf springs and possibly rubber grommets to limit movement of wheels you will be sorry. That type of trailer is extremely jumpy. And it will break your planes soon enough.

Key reasons of structure:

  • It has unlimited adjustability, as everything is based on matrix of attachment holes it can be modified easily.
  • It is not screwed to trailer. It holds in place because of main timber elements are sized so that they do not move.
  • You can pick support up from trailer easily in case you need to use trailer to something not so nice. Like transporting dirt.
  • When not in flying season it can be easily dismantled and stored for next season.
  • If you get new trailer, or as I dream of getting mobile home you can make new set of matrix structure (longitudial and cross elements) and supports are again usable.

I will explain the structure via an number of pictures. You should check out rough sketch I draw of the design. Check it here 169-01 Transport support 01. (yeah, strange name? project 169, sheet 01, version 01..).  Pics enlarge by clicking them. Hover over pic’s to read captions.

Everything starts with empty trailer. You need plenty of timber to make this structure. Best timber is fully planed and corners rounded. Actually it is (almost) most economical stuff here. Good lumberyard is your friend. First elements must be full-length compared to trailer floor. You must drill holes to to centerline of timber with distance of X between hole centers. This is not critically precise. Just keep distance constant. I used one short plank as an guide. Suitable distance is approx equal to timber width. ie. 95 x 19 timber = 10cm distance. Hole size should be 1mm (or 2mm) larger than screw size. I am using screw size 6mm (= M6) so hole should be 7/8mm. To get suitable size check your blind nut size.

At the same time you should cut crossing timber, again covering the whole floor of timber. I use approx 3 longitudial pieces and 5 crossing pieces. My trailer is 3m x 1,3. Again, drill holes with same measurements. Then proceed on making needed number of supports. Some rough examples are in drawing, feel free to design more. Send me pic if you build something awesome :).

EDIT : Corrected screw size. It was supposed to be M6, ie. 6mm screws etc.

Pictures for your viewing pleasure:

Continued Vinka build

I Started build of Vinka L-70 back in summer 2013. For several bad reasons it got stalled for some time. This has been waiting far too long so let’s get something done. Build log can be located here. It is in RCGroups which is rather good place for this type of plane. I will occasionally update this blog, but actual stuff will be at rcg.

There has been couple other postings of Vinka in this blog. You can find them with tag ‘Vinka’ on right column OR… just press here.

Nakki II plans updated

I finalized production plans of Nakki II. Changes to beta-version were extremely minor. I did widen parts A, B, C by 5mm and adjusted some of aligning holes to better suite cocktail-sticks I am using. Finalized product page can be found at here. Only thing remaining is to wait for suitable weather for maiden flight.

Final weight, with servos, receiver, 3S360-battery, motor and all installation stuff was 208g which results to wing loading of 11,6g/dm².

Finalized Nakki II plans

Finalized Nakki II plans

Next episode of quick Nakki II-project

Done. Total weight with 3S360 is 208g.

Third day of this Quick project (Nakki II)

Pics tell everything..

Second day of short project… Nakki II

And second day of this (hopefully) short project.

Short project, build day #1

Just wanted to build something quick as I have not been able to build anything more impressive for a while. Dish of day is Nakki II. Which is translated easily to Sausage II. This has been briefly mentioned in this blog some time ago. See here.

This design uses ‘perussiipi’ which is basic wing manufactured by local vendor from styrofoam. I do dislike styrofoam, but in this case it is ok, as this is sort of ‘classic finnish modelling stuff’.

I will compile extremely short build log into this blog.

Continued with PIK-26 Minisytky canopy

Well, it must be summer already as I started carving canopy out of block of wood. See previous episodes.

Some progress

With PIK-26 Mini-Sytky..

Continued with wing & tail. Decided to cut some effort by replacing stick-structure of tail with sheet. Used soft sheet to keep weight penalty to minimum. It’s just faster. Then I did also wheel cover molds.