A return to model building and flying. Part 48

March 2008

As mentioned last month I have written a piece about the Perky Speed concept. I have placed it on a separate page as it's really for reference and not part on my ongoing personal forays into control line. It's located here. And in an attempt to maintain some balance with a similar concept, here is what I have managed to glean about Weatherman Speed competitions.

I don't usually cover RC stuff but Mike Hawkins in Tasmania, (Secretary of the Hobart Model Aircraft Club), sent me some more pictures of his home made 2ch radio gear in a Super Sixty. This is well worth showing for the simple fact that not many people these days would even bother to attempt such a feat, let alone know how, so credit where credit is due. 

Mike also tells me that the club's new control line circle is getting some tender love and care, and that some old hands have emerged from the woodwork to pick up a handle and begin circulating again. This is good news indeed, and long may the trend continue.

You can see Mike's work here

Control Line World

control line worldDuring my correspondence with Graham Collins about Perky racing, he sent me a copy of Control Line World, a regular publication by Brodak. 84 pages full of interesting stuff about CL. There is an obvious bias towards CL aerobatics, but in this issue quite a few interesting bits on Carrier, and a Combat model by design by Alberto Parra, a lot on useful stuff on electric power, if that floats your boat, and electronic control down the lines (my area of future interest).

There was supposed to be a downloadable version of this magazine but the idea has either been dropped or forgotten. Personally I would prefer this method of delivery for many reasons, cost, immediacy, and kinder on the environment than shipping a pile of paper across the Atlantic.

Another regular magazine, this time electronically available from our cousins in Oz, is A.C.L.N. (Australian Control Line News) along with others, look for the newsletters button at the top of this page http://www.vicstunt.com/Lead/index2.htm This has given me quite a few hours of interesting reading.

Weatherman

I am throwing all my personal rules about building and finishing one model at a time models out the window now. After the death of my father, I need something to kick start my interest again and a couple of vintage speed models seems to fit the bill. 

I'm hoping that the MK17 powered version will double up as a racer for our club comps with a bit of silencing. And why not another one for a Mars 2,5 cc diesel I wanted to put into something.

weatherman

Weatherman production line swings on to action.

Fuel

During an unusually calm and warm spell this February, I had the chance to experiment with different amount of Nitro in some of my smaller engines installed in the Wildcat and Tutor carrier and trainer model respectively. Just for the hell of it I had mixed up some 20% Nitro and had it sitting on the bench since last year as one thing or another intervened.

It was a case of use it or mix it with something else. The Tutor has a  Thunder Tiger 15 plain bearing motor with an SC throttle, all of which you may have read about in my previous experiences. This combination has always worked very reliably on 5% Nitro and has been very fit for purpose.

On 20% it sounded even more purposeful and the difference in power was evident when I found I could prop hang it with ease, with enough power in reserve to rise vertically from a hover with ease.

This is obviously a very good mix of engine fuel and carburettor. and I am gaining quite a respect for these little Thunder Tiger engines.

Next up was the MDS18 in the Wildcat, which again has always performed very reliably on my standard 5% Nitro mix. Whilst not having the marked jump in performance that the Thunder Tiger exhibited, there was still an increase. Again most noticeable when prop hanging, allowing enough reserve power to accelerate vertically from a hover. I suspect it may need another head shim, but I am not about to dismantle a perfectly sweet good engine just to prove that. The fuel consumption with 20% also increased markedly on the MDS, on the TT it was less noticeable.

So there you have it Nitro does make a difference.

What didn't make a difference was me getting carried away with the hovering thing, and having the the Tutor turn over on it's back, only to exhibit the same characteristic as the Wildcat, that of being extremely reluctant to rotate back into the vertical position when inverted. The end result was all the old stunt experience taking over and me trying to bunt it back the the right way up from inverted flight. The inevitable happened with it loosing line tension at a considerable height and plummeting strait down flat out into the ground whilst all I could do was watch. Fortunately the ground was soft and there was only minor damage to the fuselage; nothing a bit of epoxy won't fix.

What I have to get into my thick skull is, if this happens in future, all I have to do is throttle back and just land inverted. A case of unlearning a ingrained response.

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