Monday, 22 December 2014

Gin Boomerang 10 Overview by Lauren

Gin Boomerang 10 Overview by Lauren

With 96 cells an aspect ratio projected of 5.9, flat of 7.5 (CCC measurements)  and 14.5 cm of accelerator travel coupled with a more sharky nose and B's attachment points in between the A's like the Enzo 2 and Icepeak 8, the Boomerang 10 M and L is going to leave the competition behind in head wind glides specifically.

In my opinion and of a few others, overall the boomerang 9 glides better than the Enzo 2 but, why did the Enzo 2 won more comps and glide slightly better in head wind even although its accelerator is smaller, only 12.5 cm?

As I found out a couple of days ago, my boomerang 9 was certified with 14cm speed travel but the pilot can only achieve the fully length by totally overlapping the pulleys, takes a lot of leg power and its dangerous by getting the pulleys locked and tangled or tearing the accelerator line. My guess is that Gin did it that way, to avoid pilots from getting over the 14cm range and cheating. without overlapping pulleys, the boom 9 will only give you 12cm.

So how did the enzo 2 glide better in head wind than the boomerang 9 with 12.5cm?  The answer is simple. Unlike the boomerang 9, the enzo reaches 12.5 cm without overlapping the pulleys, in other words, after you overlap the pulleys you gain another 2.5 cm that brings the enzo 2 accelerator to 15 cm, not only that the enzo also has an "appendix" like top pulley, allowing very easy cheating in flight, if the pilot move the loop from the top pulley upwards, he could gain another 2 cm, bring the accelerator to 17cm! As most pilots are aware, in head wind glides, the less angle of incidence you have (more speed travel) the better your penetration/glide and that is where I think the Enzo 2 had a slightly advantage, not because the enzo 2 was better but because pilots were able to gain extra speed by overlapping, which isn't possible with the boom 9 as overlapping will only give you the certified 14cm, not a millimeter more.

With the new CCC limiters, the Enzo 2 will not be able to go over its original 12.5cm certified range, the boomerang 9 with its 14cm, the Icepeak 8 with 13cm and the boomerang 10 with 14.5cm, will in my opinion obliterate the enzo 2 in head wind glides in the ucomping competitions (giving all pilots flying at the at the same wing loading of course).

I strongly believe we need a to limit the speed of CCC glides at 14cm and the distance between the B and A rows in the sail, B no further than middle of the sail towards the leading edge, otherwise its going to be a race for cheating and manufactures trying to get the speed ever higher without any further real improvement in technology of the sail itself, plus pilots need to understand that the more he/she accelerates the lower the angle of incidence and the closer he/she is from the collapse, there is no way around that. Some gliders like the Icepeak 7 pro has a very high angle of incidence at trim, that allowed its accelerator travel up to 15cm, but don't be fooled, that is because at trim the angle of incidence is 2.5cm higher than other gliders, when it goes full bar, the angle of incidence is about the same as others, giving around 12.5cm. Because the angle of incidence of the icepeak 7 pro is so high at trim, it makes the glider more collapse resistant, understand that the higher the angle of incidence the further away the pilot is from the collapse, the drawback is that, it makes the glider wobbly, which the icepeak's are well known for.

At around 18cm (old open class) the angle of incidence is about to go negative (collapse) at full speed, we all know that pilots in competitions will push full bar no matter how close they are from a negative angle of incidence (collapse) frequent frontals and accidents will come back and the CCC class will be ruined by the same problem we had in open class.  I will write a full article explaining why I believe CCC gliders should have the speed travel limited to 14cm maximum, nowhere near 18cm as it is at the moment.

Back to the boomerang 10! The boomerang 10 is basically a boomerang 9 with improved stability by the little forking B's and shark nose and with a little bit more speed. The boomerang 10 has a little bit more lines due the forking B's to improve stability. I would say Boomerang 9 and 10 will glide about the same but the 10 will have a slightly advantage in head wind glides due its 5mm extra speed travel. As the boomerang 9 was the best glider ( without the enzo 2 getting extra 2.5cm over pulleys).

In my opinion, I believe the Boomerang 10 size M and L  together with Nef Olivier Icepeak 8 26 are going to be the kings. Unfortunately the size Small of the boomerang 10 doesn't not offer the same wingloading (speed) as the M and L, the same can also be said about the Icepeak 8 22 and 24.

For light pilots, I believe the Enzo 2 XS 20.3 flown at 95kg (4.7kg/sqm flat) and the Boomerang 9 S 21.2 at 105kg (5.0kg/sqm flat)  are going to be the most competitive small gliders, specially the boom 9 21 if one has enough weight to fly it at 100-105kg.

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Lauren Martins

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