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Author Topic: VIT for Coupe  (Read 220 times)
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billdennis747
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« on: December 03, 2018, 04:24:18 AM »

Please could someone post a picture of how to arrange VIT from a single Tomy timer on a Coupe? Since mine turn once a minute, all I can think of is a double disc so the lever moves from one to the other for the two minutes. Then  to avoid compromising the DT time, one of the discs has teeth around the edge like a clock wheel to hook the VIT line onto. I'm sure there are much better ideas, and I'm sure it's all in Aeromodeller but I know what happens when I sit down with a mountain of magazines for a search!
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tctele
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« Reply #1 on: December 03, 2018, 06:19:38 AM »

The one in the model is John Barker's design I'll try and find a pic for the conversion. The other one is just a bit of wire soldered to form a T. Both work
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RalphS
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« Reply #2 on: December 03, 2018, 07:05:16 AM »

This was my approach.  Tomy timer with DT wire wound onto shaft and VIT release fixed to winding knob.  At the back end the M2 nylon screw adjusted the stop position for the VIT and the DT release disc could be adjusted to give the optimum fly/glide position. 

The use of VIT makes trimming easier and does away with lots of downthrust for the burst.  I liked my props to pull in the direction that I wanted the model to fly rather than pointed to the ground  Grin.  As to flying LR - never understood the reasoning.

With my thin outrigger props I reckoned that they went into a higher pitch in the burst and as a result I needed a VIT period between 10 and 15 seconds.

Did they fly the contest yesterday?

Ralph
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billdennis747
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« Reply #3 on: December 03, 2018, 07:19:36 AM »

Did they fly the contest yesterday?
Thanks Ralph. Yes we flew. Turnout was low and it was windy, from the 'turbulence' end of Barkston.  Lots of swooping initial climbs but I enjoyed it anyway!
Why have I never needed to use downthrust on a duration model?
Bill
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PeeTee
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« Reply #4 on: December 03, 2018, 07:47:08 AM »

I didn't go, but my spies tell me that it was won by Phil Ball!
« Last Edit: December 03, 2018, 07:58:59 AM by PeeTee » Logged
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