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F3-RES UK Competition Interest


Neil Stainton

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martynk
34 minutes ago, StraightEdge said:

Having cut my teeth on the bungee with a 2nd hand PuRES (warps and all!) and hugely enjoying the postal, I'm thinking of buying a second 2m RES model to build myself (clean of draggy warps which fight one another and which performs the same turning left as well as right!)  I'm considering electric for this, simply because it would open up more local public launch sites to explore but which aren't suitable for laying out even a small bungee etc.

I'm not thinking at this stage of entering actual competition meetings, and so don't want to get involved in installing complicated height/time limiters if I can help it.  If later on I do wish to partake, and the system become official, then can always retrofit the necessary gubbins.

So, to keep it simple for the postal for the time being, and relying on personal honesty obviously so that I'm playing on a fair and level field, what would be an acceptable system to abide by?

  • A limited motor run via a countdown timer on the TX of say 20 secs (these are the current postal rules) before flicking the off-switch (or programme the Taranis to cut the throttle automatically)?
  • A height limit of say 75m (I currently get between 65 and 85m on good launches depending on wind conditions etc)?  Can either explore whether the TX could be programmed to cut the motor at set height, else I'd need to have the spoken altitude on for the launch and do it myself?
  • Both (whichever occurs first)?

Jon

 

Hi Jon

comments noted. With all postals, there is an element of trust but we do need to keep the competition meaningful. But see my previous reply

It would be nice if you (and others) would enter formal competitions when they are run this year. The NW Area (myself and John Minchell) are looking at organising a  4 line F3-RES and F5-RES contest, I think ISA are also doing something and possibly MikeF is putting something on at Buckminster.. 

One of the benefits of using limiters is that they can be over-ridden if you run into problems down wind.. of course if you do reactivate then you score a zero..

Regarding height limit. I went for 70m limit because an F5-RES has one advantage over an F3-RES at launch, they can be pointed into a patch of air whereas a F3-RES launch position is somewhat more restrained. I am still not convinced that getting 80m+ at launch is accurate, a 50m line plus a bungee stretched to 75% of limit at the point of release seems unlikely (to me) unless its a huge boomer. In the OP, I did state that the rules could be amended as the season progresses if competitors decided that one class was significantly advantaged.  At the moment, I don't think there is anything to suggest that there is a huge disparity.

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StraightEdge

Hi Martyn and Jon

Thanks for the replies, most informative and helpful - and completely happy to work to 20secs and/or 60/70m (which is it?).  By the way, my current launches with the 320g PuRES do vary:  no activity then say 50-60 meters, if some ambient wind (and I launch almost vertically and work the line on the way up without fouling things) then 60-70m, if into a boomer then have recorded 80-90m.  I'm not fully sold on going electric (love the simplicity and low cost/complexity of bungee) but thinking about it...

As I said earlier, the primary advantage of electric is that it will free me up to try different local sites etc.  But if playing against the overwhelming majority for the postal, which is bungee-launch, there remains some asymmetry if flying electric-launch: faster turnarounds to take advantage of thermal cycles, riskier attitude to flying further away, etc.  Will ponder...! 🙂

Finally, yes, keen to participate in any competition events that could be organised this year!

Jon

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martynk

It's on each challenge OP: :) 

 

1. a bungee-launched glider up to 2 metres wingspan and the standard Hi-Start can post a time. The standard Hi-Start bungee is a maximum of 10m of 6/4mm surgical tubing and 50m of static line (minimum 30lb breaking strain). Lighter/smaller bungee rubber may be used.

OR

2. an Electric motor launched glider up to 2 metre wingspan fitted with an Altitude Limiter set to 60m and a maximum motor run time of 20 seconds

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StraightEdge

Thanks Martyn - I only got confused because Jon W had mentioned "70m" earlier, hence my question.

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Whitmore

Not me Guv! 😂

Regarding launch height on the bungee, I was getting over 80m recorded on the altimeter in a breeze with the Skiddoo but then it did weigh 200g. Used to come off the top of the line with an almighty ping. Can't remember what the Slite was getting but probably a bit less unless into lift. Heavier models in light winds would struggle to get 80m.

I think the E rules are probably just about right although I would still like to see a way of including electric launch without altitude limiters. A few months of the postal should show if anything needs changing.

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paulj
On 20/04/2021 at 10:49, martynk said:

It would be nice if you (and others) would enter formal competitions when they are run this year. The NW Area (myself and John Minchell) are looking at organising a  4 line F3-RES and F5-RES contest, I think ISA are also doing something and possibly MikeF is putting something on at Buckminster.. 

One of the benefits of using limiters is that they can be over-ridden if you run into problems down wind.. of course if you do reactivate then you score a zero..

Hi Martyn (and John!),

Do you have dates in mind already for this competition in the NW area? I could be tempted to come over from North Wales...!

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martynk

Hi Paul

I'll let you know as soon as I have a date with @john Minchell

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John Minchell

Didn't know you fancied me Martyn!

With two weekends at Buckminster in June and July already booked, the cancelled Barkston Radio Nationals weekend in August looks a possibility.

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