Originally Posted by ms200a

Hi All, I have the Boomerang MB-339, 25 flights todate, arizcowboy was very helpful in the cg and other info, this is my setup;

​​​​Aileron High 20mm, Mid 15mm, low 10mm. expo 10% on all, I like mid position the best. Elevator high 23mm, mid 19mm, low16mm,15% expo all. Again I like mid position the best. I also slowed elevator servo down a touch to keep from inducing pitch oscillation and getting into the huck a buck when landing. Flap Mid 13mm, Full 40mm, mixed in crow Ailerons up10mm, CROW ONLY with FULL flap! Flaps slowed down to soften any pitch change and look more realistic on ground. Flap elevator mix, none on mid, 2.6mm down elevator on full Flap.
CG. location Larry Roper Boomerang jets said; The Leading edge of the wing tip and arizcowboy (rcuniverse) said his HSD is at 135mm from where wing meets fuse. Mine is now at 131mm from leading edge where wing meets fuse. With a swept wing this can be a bit tricky to measure where the balancer makes contact to the wing. Because the trailing edge has no sweep, if you measure from trailing edge forward it works out to 257mm, with cg set at that point, it still needs some down elevator in inverted but not much. FWIW my flying style is lazy, I just like to turn, roll, loop, split s, Immelmann, that stuff, I fly with an old p-70 for power at a little better then 1/2 throttle and at full across the deck to build up energy for vertical stuff. I can fly for 7min but keep it around 5 for fuel cushion incase someone needs to land or has trouble. The wing tanks will also help slow it down and you'll need to stay in the power base to final which for me is good because the P-70 spool up time is measured with a calendar. The crow acts like a bit more washout. I rate all my planes this way "would I buy it again" Yes absolutely, already saving for a 2nd one to dress gray camo. Fly's like a trainer because it is one, Qualifies as a warbird because it is one. As the Italians say Ciao

Originally Posted by extra 300

ms200a,

Thank you very much for taking the time and providing your settings which are a big help! I have one concern which is the landing speed. We have a rather short runway about 120 meters paved with no room for mistakes and unfriendly run offs. Can you please advise the MB339 is able to land slow without having the risk to stall
Thanks in advance
Regards

Originally Posted by extra 300

ms200a,

Thank you very much for taking the time and providing your settings which are a big help! I have one concern which is the landing speed. We have a rather short runway about 120 meters paved with no room for mistakes and unfriendly run offs. Can you please advise the MB339 is able to land slow without having the risk to stall
Thanks in advance
Regards

Originally Posted by extra 300

ms200a,

Thank you very much for taking the time and providing your settings which are a big help! I have one concern which is the landing speed. We have a rather short runway about 120 meters paved with no room for mistakes and unfriendly run offs. Can you please advise the MB339 is able to land slow without having the risk to stall
Thanks in advance
Regards

Originally Posted by DUCMOZ

Hi MS200a

Thanks for all the details. From what you see, do you think the gear / gear mounts would hold up on a semi rough grass field ?

thank you.

Originally Posted by why_fly_high

Unrelated to this particular airplane but do you run air speed telemetry? When I started using airspeed telemetry it made landings so much more consistent and landing on shorter runways much easier.

Originally Posted by ltc

Question on turbine size for this plane.
The description on BananaHobby states : "Engine is ready for your 80kg to 140kg turbine"
I have a JetCentral Cheetah SP (140 size) available. I fly from a grass field, about 200m long.
Is it practical to put a 140 in this plane? Most people seem to be at the lower range of turbine size.
Also, on the Boomerang RC site, the turbine size range is listed as "Recommended turbine size 6kg - 10kg. "

Originally Posted by rhklenke

Well, 1 kg force equals 9.81 Newtons, so Banana Hobby is saying you want an engine that produces between 784 N to 1373 N. A Cheetah Se is a 160-class engine meaning 160 Newtons of thrust. So at a minimum, Banana Hobby has the units all off. Now in the detailed information they say " 8~12kg (17.6~26.5 lb) turbine engine (not included) " which is closer.

The airplane has a 68" wingspan and is listed to weigh 21 lbs with turbine and fuel. At 21 lbs, an 80 will push it very well. A 140 (or 160) would rip the wings off! I'd trust Larry at Boomerang when he says a 6kg (60 size) to 10kg (100 size) turbine. I watched him fly it off of grass at the Tiger Meet in SC and it did fine. Ask him what size engine he had in his.

Bob

Originally Posted by afioretti

I spoke to Larry about this.. He is a great guy and a very honest business person. I would listen to him ... He knows the plane because it is his design.

Andy
CRX Turbines

Originally Posted by arizcowboy

that's some funny stuff there. I like Larry , but he did not design the MB 339 . I talk to the owner of factory at least three times a week .

Originally Posted by afioretti

Terry... there is some serious discrepancy over the rights of this model and the design. Does not matter who the factory is.

Originally Posted by RCJETWERX

Come on. Is this like the time you said you were the only place to buy Swiwin engines? Weve been selling this plane for six months now. Larry (a great guy) is a vendor just like the rest of us. But he didn't design it. He imports it just like the other distributors selling it.

Originally Posted by charlesyoung