August 2009 - New British MTA record
In an unexpected calm end to a very difficult day at Trefriw 17 throwers had a great session of MTA. Conditions were really nice for some great times. Mark Holman-Lisney after first dropping a 41 sec MTA followed by a 1 min 4 sec that drifted outside the 100m, then threw a huge 57 secs for a well deserved win and new British record. The boomerang used was a Manu carbon fibre MTA for all the throws.
Jens also threw a New Danish Record of 40.59 seconds. In all there were 6 times over 30 seconds which is pretty damn good. When a 33.07 secs by Robbie Russ places him 6th, that says something about the high standard.
Immediately after the event, Adam threw one of his Carbon MTA's which lazily drifted along for a catch just 30m from launch and a time of 1 minute 21 secs.
Mark swears by his new technique of launching. He says -
"This is announcing the arrival of the Lisney Loop Back. This is a bit like a Fosbury Flop of MTA Boomerang Throwing.
Prior to Dick Fosbury all high jumpers approached the high jump bar and tried to clear the bar stomach first. The jumps were the straddle and some other style I can’t remember the name of. Then Dick Fosbury broke all the records by approaching the bar from a different angle and flopping over the bar backwards. Hence the Fosbury Flop.
In MTA throwing we are all taught (if we are right-handers) to throw the boomerang to the right of the oncoming wind (one or two o’clock), and often as high as possible (70/80 degrees). The tendency with the manufactured carbon fibre booms has been to throw closer to the wind, and with a negative laid over angle which makes it more difficult to get power into the throw.
What I have discovered, I think, is that if you throw across a light wind (at about 10.30 or 11 o’clock), and throw almost horizontal to the horizon or even slightly down, with a vertical boom (no layover)…..you can achieve more height and stability and therefore longer times.
What seems to happen is the boom hits a point on the outward trajectory where the lift within the boomerang takes over violently, and the boomerang shoots upwards vertically very quickly. When the upward trajectory starts to lessen, the boomerang starts to lay over, but does so (critically) at an angle where it is laying over into the wind. This makes the boomerang enter into a tight spiral for the last part of its upward flight and then stabilise.
The critical difference between MTA flights with highly vertical flights that stabilise and those that don’t, seems to be the angle to the wind that is prevalent when they start to loose upward momentum and start to layover. If the boomerang starts to layover as it is going into the wind, the boomerang will lift in a tight spiral and stabilise. If it starts to layover with the wind coming from behind the boomerang goes into a stall and the characteristic death spiral ensues.
Therefore by throwing across the wind you are able to take advantage of the fact that by the time the boomerang is coming out of its upward trajectory, it is facing into the wind and will stabilise. This is also what happens when you throw with a negative layover to the right of the wind,….. but when you throw with a negative layover you cannot get as much power into the throw as when you throw across the wind.
This throw is what I have previously referred to as the ‘bounce throw’ as the boomerang appears to bounce upwards from a low point in the throw.
I have only tried this with carbon fibre booms and I am not sure what would happen with other MTA’s. I have tried in low to medium winds and can get it to stabilise 9 times out of 10. The other night I compared this to normal throws of the same boomerang, and was consistently getting higher throws and better times using the Loop Back."
So there you go, no arguing about Marks results! - any comments on Marks new method?
Page last updated Sunday, 4 July 2010