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IIFI 2011 in Nijmegen 2011-05-21--22
5 Replies

Started this discussion. Last reply by Akihiro Danjo May 31, 2011.

European champs for F1D

Started Apr 2, 2011

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The Indoor Aeroplane

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Building and flying indoor model airplanes

It is very difficult to find this excellent book, but now you can read it in Google books:

Posted on May 28, 2013 at 8:20am

F1D world champs in Belgrade 2012

Here are the latest information about the contest:

Congratulations to Lutz Schramm for his first place!

Posted on August 14, 2012 at 3:55pm

Swedish Nationals in Malmö 2009-08-01

Hello all indoor flyers!

This time we had really good media coverage of our indoor Nationals. Swedish public service television SVT1made a 15 min film from our event and it was broadcasted yesterday.

Today you can see this film here:,a1364159,1,f,-1/pb,a1364158,1,f,-1/pl,v,,1641365/sb,p104188,1,f,-1

Go to time 1:43:58 and you will find some nice shootings with comments in Swedish.… Continue

Posted on August 3, 2009 at 10:30pm

Bosön Junior event 2009-05-02


SLM will be the host for an event for all our juniors. We have sent out an invitation to all young people that have shown interest i free flight rubber flying at Barkarby Skaladagar (biggest scale event since 20 years) and Hobbymässan (Hobby Fair), around 1.200!

It will be very interesting to see how many juniors that will show up! We have planned that the juniors will fly a contest with simple ready-made rubberdriven stick models (=Lucas and Lucy) with Depron… Continue

Posted on April 23, 2009 at 5:55pm — 1 Comment

SLM F1L-course in Stockholm

Hello everyone!

Saturday 4th of april I held a theoretical F1L-course at the office of SLM Stockholms Läns Modellflygförbund (=Stockholm County Model Flying association). There were 5 participants present together with Jim Davy who is reponsible for education at SLM.

I started with a PC projector display showing the history from Easy-B to F1L, present rules, balsa selection, propeller, rubber motor, building tips, useful accessories, trimming and tactics for… Continue

Posted on April 9, 2009 at 9:25pm

Comment Wall (16 comments)

At 8:42am on March 20, 2009, nick aikman said…
Hi Sven,

I see that you are getting new members - great! Can I invite people to join too?

I have been producing top quality indoor wood for 2 years and now, most of the top indoor flyers in Europe have it. Schramm, Popa, Mangalea, Ree, Orsovai and many others from France/Italy/Spain/Czech Republic etc have my wood - I take a lot to the European and World Champs every year and send it by post too. The machine was built by Ron Green and when he passed away, he left the machine to me so now, I continue his tradition.

I have about 4000 sheets of wood in stock, from 0.007 up to about 0.13. Most people want A grain for F1D/F1L/F1M etc spars and prop outlines and also, C grain for ribs and for sticks/booms and thin prop blades. Now that Spring is here, I will start cutting again - mostly, thin C wood for stick and boom and prop blades but I also cut wood for scale flyers too.

The wood is not cheap. 1 sheet is 5 Euros/English Pounds and I also have some Premium sheets that are 6 Euros/English pounds - either because, the grain is fantastic, or stiff, or the sheet is very wide or longer than normal. When I post wood overseas, I charge 10 Euros for insured postage and there is a minimum order of 10 sheets.

So, if you want some wood for blades and sticks/booms or anything else, please send me a list of exactly what you need. I will not send bad wood and so far, nobody has complained.

I prefer payment as cash in Euros/Pounds, sent to me in a registered letter.

Please tell all your Scandinavian friends too.

Best wishes and happy flying,

At 3:20pm on March 20, 2009, axel wallin said…
great idea sven

fun that make a site for indoorpilots, thank you
for the invite. will look at this page a lot!!

cheers axel
At 11:36pm on March 23, 2009, David said…
Sven, it's nice to see your photos! Inspiring to get a glimpse of the activity at Bosön - hope to see you there sometime soon..
At 1:00pm on April 1, 2009, Tapio Linkosalo said…
I think it has all to do with P/D ratio and pitch distribution. If you take a prop with helical pitch, and twist it to a higher angle, the root pitch increases more than at the tip. And vice versa. so the outcome of changing pitch is a prop with the pitch distribution quite far from optimal. Also, dr. Drela has some nice calculations to show that P/D ratio of an efficient prop should be something like 1.5 to 2.0 (while the precise value is not too critical), and extreme changes of the pitch move the prop out of this optimal range.

I recall reading (in Indoor Mailing List) Drela's analysis, with the conclusion that the only thing that VP does is reduce the prop efficiency so that at high motor torques the model does not climb to the ceiling. Even this is a benefit, as with fixed pitch you would need to back-off those high torque turns, and it gives longer flight time if you can use those turns flying, even at poor prop efficiency. But, of course, the flight time would be even longer if the prop efficiency could be increased. VD seems to offer this, but thus far the technical details have been much more difficult than the current standard of VP mechanisms.
At 8:28pm on April 1, 2009, jan carlson said…
Tack för tipset, visste jag inte...kommer gärna, måste man anmäla sig?
At 10:23pm on April 8, 2009, Adrian Henkel said…
Hello Sven!

I will do my best to express my self in english.

At 5:21pm on May 9, 2009, Magnus Borg said…
Hej! Det var ett tag sen vi sågs! Har några 25-öringr kvar i en kartong. Dom har ngr år på nacken, behöver nog byta gummimotor.
Vem vet jag kanske dyker upp ngn gång.

Ha dé magnus
At 11:40am on August 16, 2009, Rolf Svensson said…
No I do not know him. Is that the pilot you talked about ? Vero Beach is north of me but I will check with him. Thank you !
At 11:56am on August 16, 2009, Rolf Svensson said…
Thank you Sven !
Enjoyed that evening. Gave me some inspiration to build F1L again.
Hope to fly more in Florida and next year in Uppsala.
Thank you !
At 7:58pm on October 12, 2009, Derek Richards said…
Hi Sven, sorry for the delay in responding. We are preparing to fly our team trials later this month, after flying our National championships in a hanger at RAF Digby. I used the access to the hanger for some trimming and fault finding on an F1d. Now I'm happy with it. And I had a new F1d motorstick to setup. I had an interesting problem with the new stick, Usually the problem is too much wich twist on high power (circa 35+ gcms torque), but the new stick doesn't appear to twist very much at all. The climb pattern on high power is exciting but it does get away eventually.

ANy way appologies again.


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