Friday, April 20, 2018

Tivoliberget Forts

I had a long day at my Kista office today, but on the way back to the airport I managed to scout ruins of fortifications and bunkers at Tivoliberget in Bergshamra, Solna, near Stockholm.

These are not part of the Korvlinjen that I've been tracking earlier. More information about the fortifications can be found here.

I found a bunker, at the top of the hill there some fortifications (perhaps bases for guns), and there's also basement ruins of a house.

And nice graffiti!

Coordinates for the bunker are N 59.37502629 E 18.03478, for the ruins N 59.37506 E 18.03388, and for the fortifications at the top of the hill N 59.37472 E 18.03345.

Photos (c) 2018 by Jari Arkko. All rights reserved.

Bromma Airport

Many things are better in Sweden than in Finland. Take their appreciation of small city airports, for instance. Bromma is a small but thriving airport in Stockholm. Whereas in Finland... the idiots are tearing down a historic airport.

Bromma is so convenient for me; it is a 10 minute drive, max, from the office. And it is so small that their maximum queueing situation can result in whopping 4 minute lines through security.

What's not to like? Well, trying to find a seat in the waiting hall or a free bathroom at a busy evening our can be a bit challenging. But I'm sure the new terminal buildings under construction will fix these things.

But Helsinki, oh Helsinki, why are you tearing down the Malmi airport, just when quadcopters, delivery drones, and small aircraft are about to boom? It is a crying shame to destroy a world class historical airport. Why? For the sake of some friendly construction company deals, or gaining more customers for city mayor's nearby businesses?

Photos (c) 2018 by Jari Arkko. All rights reserved.

Friday, April 13, 2018

Ylläs 24H Live!

Tero and I are joining the Ylläs 24h race. They hold the ski lifts running for 24 hours straight... and whoever skis most vertical, wins. There will be no rest :-)

I've participated this competition a couple of times (see here and here). I don't really feel like I'm good shape this year, but lets see how it goes. Ski as much as I can. At least it will be more vertical than on a usual ski day :-)

This year I will be tweeting live pictures and video as the race goes on. Follow the hashtag #yllas24h or my twitter handle @jariarkko.

Here's the team:

And here's how it looked like in 2015, including my visit to the Gondola sauna:

Tämä blogi löytyy myös suomeksi Relaasta. Photos and videos (c) 2015-2018 by Jari Arkko. All rights reserved.

Thursday, April 12, 2018

New Helmet!

My old helmet broke (maybe in transport), and since parts are now sticking out, I needed a new one. I got a helmet with an integrated visor, and it will be interesting to see how it works.

The helmet model is Salomon Driver. It seems to work with my eyeglasses on; but I consider this an experiment. I really don't know if this type of a helmet is suitable for me. I think it will be convenient for the Ylläs 24h competition that is coming up in two days.

I like the helmet's style, it fits well, and is compact. Some of the question marks for testing include:

  • Will it work well with my glasses in reality?
  • If I'm going at high speed in the competition, will the visor actually protect me eyes from excessive wind?
  • Will the visor become scratched or broken in transport?

We'll see! I'll report back.

And where else to get it than from my trusted source, Ski Service in Pitäjänmäki:

Photos (c) 2018 by Jari Arkko. All rights reserved.

Saturday, April 7, 2018

More Sepänkylä Bunkers

Olli and I went to Sepänkylä to visit more bunkers, and to fly our drones. We found a standard Soviet Porkkala bunker model, relatively intact except for the room under the gun hole. But what wonderful flowstone!

I've also been doing some reading about stalactites and concrete. Stalactites and flowstone are examples of speleothems; in concrete structures such as bunkers, these can grow very quickly. But they are technically not classified as speleothems in concrete, because the definition of the relates to caves:
Definition 1. Speleothems are secondary mineral deposits formed in a cave [1].
Flowstone is sheetlike deposits of calcite or other carbonate minerals [2], in a cave environment. In concrete, it is called concrete derived flowstone [3]. This is an example of calthemite:
Definition 2. Calthemite is a secondary deposit, derived from concrete, lime, mortar or other calcareous material outside the cave environment [4].
What I definitely did not know before was that calthemite and speleothems actually form with different chemical reactions. Calthemite comes from calsium hydroxide (leftover from making concrete) reacting with carbon dioxide as the two come into contact when dripping water from the concrete reaches air:

           Reaction 1: Ca(OH)

 + CO

 → CaCO

 + H

The resulting solution contains calcium carbonate, some of which will be left on the surface as the water drops away.

But regular cave speleothems form through calcium bicarbonate (from dissolving limestone) reaching air and turning to calcium carbonate:

           Reaction 2: Ca(HCO
 → CaCO(s)
 + H
 + CO(aq)

In other words, both processes end up with calcium carbonate on the surface of the growing flowstone or other speleothem/calthemite, but the process at which they come to this is different.

While cave stalactites grow very slowly, few millimetres per year, calthemite can grow much quicker. A calthemite straw stalactite can grow 2 millimetres per day in optimal environments [3].

The coordinates of the bunker we visited are N 60.161310 E 24.502157.


Here are more pictures of the flowstone. I mean concrete derived flowstone:

Forest and the bunker from above:

The entrance and emergency exit:

And here's the drone pilot:

Tämä blogi löytyy myös suomeksi Relaasta. This blog is also available at the TGR site. Photos and videos (c) 2018 by Jari Arkko and Olli Arkko. All rights reserved. The song "Hollywood High" is by Silent Partner, and freely available from YouTube audio library.

Wednesday, April 4, 2018

Easter Bunny Walk

April 2nd and the Easter. I'm back from the US, and far too jet lagged, but managed to go out on a walk in Kauniainen. Walked around the lake, through the small nature reserve swamp, through the underground tunnels... and also saw an easter bunny :-)

Photos (c) 2018 by Jari Arkko. All rights reserved.

Monday, April 2, 2018

Pool at the Big Bear Frontier

When visiting the Big Bear Lake ski areas, I stayed one night in the village, and obviously had to try their pool. Even if there was no sauna...

The place, Big Bear Frontier, is a rustic (I'd say 2-3 star) and nice place, but with a great location. It is within a walking distance of the village shops and restaurants. The pool was quite warm and nice, and I was able to regain heat that I usually get from sauna visits.

Photos (c) 2018 by Jari Arkko. All rights reserved.