new Arf Boomerang 14lb thrust
10-16-2007, 02:38 AM
#2151
My Feedback: (2)
RE: new Arf Boomerang 14lb thrust
I use the Multiplex receiver (12 synth) which already accepts two battery packs (5 cells each) and decide which one to use.
I agree that it is good to have two battery packs for the receiver.
On the other hand i use the Kavan brake, now one in each main wheel so i don't need the pneumatic brakes.
They are heavy but i managed to balance the plane without adding weight.
Go fly it and have fun.
Chris
I agree that it is good to have two battery packs for the receiver.
On the other hand i use the Kavan brake, now one in each main wheel so i don't need the pneumatic brakes.
They are heavy but i managed to balance the plane without adding weight.
Go fly it and have fun.
Chris
10-16-2007, 02:42 AM
#2152
My Feedback: (2)
RE: new Arf Boomerang 14lb thrust
Hi and congratulation for the first flight, i know the feeling as i felt it a couple of weeks ago.
If and when i find some cash i will go for the Velox XL.
Right now i am more than happy with the Boomerang intro and i plan to fly it until it melts.
Chris
If and when i find some cash i will go for the Velox XL.
Right now i am more than happy with the Boomerang intro and i plan to fly it until it melts.
Chris
10-16-2007, 04:10 AM
#2153
My Feedback: (2)
RE: new Arf Boomerang 14lb thrust
I am writing this post just to verify what other people have done and proposed about opening additional air intakes.
I opened a couple more intake holes and the spool up time is improved as well as the egt's.
I should have done this from the start.
Here is a photo of the new intakes.
Chris
I opened a couple more intake holes and the spool up time is improved as well as the egt's.
I should have done this from the start.
Here is a photo of the new intakes.
Chris
10-16-2007, 09:03 AM
#2154
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RE: new Arf Boomerang 14lb thrust
Hello, Hendrix:
This are my aditional air intakes.
http://www.rcuniverse.com/forum/fb.asp?m=6367705
With out this, my turbine flame out in 2º and 3º fly. Untill this modification, ( now my plane has 20 flights) no problem at all.
BUT..... ¿Have you measure your turbine thrust with and without the plane cover?
I have measured it, and there is a big diference, ( at least static thrust) Probable it´s needed more air intakes?
This are my aditional air intakes.
http://www.rcuniverse.com/forum/fb.asp?m=6367705
With out this, my turbine flame out in 2º and 3º fly. Untill this modification, ( now my plane has 20 flights) no problem at all.
BUT..... ¿Have you measure your turbine thrust with and without the plane cover?
I have measured it, and there is a big diference, ( at least static thrust) Probable it´s needed more air intakes?
10-16-2007, 10:27 AM
#2155
My Feedback: (2)
RE: new Arf Boomerang 14lb thrust
Hi.
It was your hatch intakes that i saw and decided to make additional intakes on my Boomerang also.
I also experienced a flame out during Take off when i programmed a smaller acceleration delay (perfectly working in the test stand for at least 20 tests)
so this got me thinking.
High spool up times during take off and flight also got me a little puzzled as the turbine was much faster in the test stand.
Without the hatch there was no problem so i figure out that i need more intake area.
The additional air intakes are also further front from the turbine intake and i think this is also very important.
I haven't measured the thrust because i fly with the throttle at 1/2 top and when i did used full throttle the vertical performance was
fantastic so it didn't crossed my mind, but the spool up time is shorter and the Egt at max power is lower so probably the thrust is up also!
During take off the lower spool up time is clearly evident.
Maybe it really needs more intake area or/and better ducting as i imagine that the hatch must distort the airflow in any case.
My opinion is that a custom duct should be made which will guide the air from the existing side openings to the mouth of the turbine
much like a split duct used with the EDF jets like the Sniper or a single duct to the turbine mouth like the EDF f16.
Chris
It was your hatch intakes that i saw and decided to make additional intakes on my Boomerang also.
I also experienced a flame out during Take off when i programmed a smaller acceleration delay (perfectly working in the test stand for at least 20 tests)
so this got me thinking.
High spool up times during take off and flight also got me a little puzzled as the turbine was much faster in the test stand.
Without the hatch there was no problem so i figure out that i need more intake area.
The additional air intakes are also further front from the turbine intake and i think this is also very important.
I haven't measured the thrust because i fly with the throttle at 1/2 top and when i did used full throttle the vertical performance was
fantastic so it didn't crossed my mind, but the spool up time is shorter and the Egt at max power is lower so probably the thrust is up also!
During take off the lower spool up time is clearly evident.
Maybe it really needs more intake area or/and better ducting as i imagine that the hatch must distort the airflow in any case.
My opinion is that a custom duct should be made which will guide the air from the existing side openings to the mouth of the turbine
much like a split duct used with the EDF jets like the Sniper or a single duct to the turbine mouth like the EDF f16.
Chris
10-16-2007, 11:53 AM
#2156
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RE: new Arf Boomerang 14lb thrust
Question for all you Boomer Pilots....
I have been told that the boomer will not fly if the top hatch is not in place, as in lost in flight. Becomes totally uncontrollable. Any truth to this??? Anyone lost a hatch and lived to tell about it?
Personally, I think it is bunk....
I have been told that the boomer will not fly if the top hatch is not in place, as in lost in flight. Becomes totally uncontrollable. Any truth to this??? Anyone lost a hatch and lived to tell about it?
Personally, I think it is bunk....
10-16-2007, 12:07 PM
#2157
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RE: new Arf Boomerang 14lb thrust
I think there is a post somewhere in RCU that i have read about a hatch flying apart in mid flight but the plane landed safely as usual.
Wait for more answers but i think the plane will fly well for landing without a top hatch if everything inside is secured.
Chris
Wait for more answers but i think the plane will fly well for landing without a top hatch if everything inside is secured.
Chris
10-16-2007, 12:13 PM
#2158
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RE: new Arf Boomerang 14lb thrust
No worries about losing the top hatch. Over the years I have had 3 different incidents where I have lost the entire top hatch. Twice with intro and once with Elan, in fact once with XL as well. Each time the plane landed fine. Yes a little more drag, and in the case of the elan we had the fuel tank swinging around by the fuel line. [:@] So I would very much doubt that the model became uncontrollable without the hatch.
Regards Al
Regards Al
10-16-2007, 12:23 PM
#2159
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RE: new Arf Boomerang 14lb thrust
Just as I suspected. The person who relayed this information got it first hand from a guy who lost his boomer and blamed it on the hatch failing and departing in flight. His claim was the aircraft is totally unflyable with it missing. A crash was the result. I figured it was BS cover for lack of skills....
10-17-2007, 12:14 AM
#2160
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RE: new Arf Boomerang 14lb thrust
ORIGINAL: hendrix
Hi.
It was your hatch intakes that i saw and decided to make additional intakes on my Boomerang also.
I also experienced a flame out during Take off when i programmed a smaller acceleration delay (perfectly working in the test stand for at least 20 tests)
so this got me thinking.
High spool up times during take off and flight also got me a little puzzled as the turbine was much faster in the test stand.
Without the hatch there was no problem so i figure out that i need more intake area.
The additional air intakes are also further front from the turbine intake and i think this is also very important.
I haven't measured the thrust because i fly with the throttle at 1/2 top and when i did used full throttle the vertical performance was
fantastic so it didn't crossed my mind, but the spool up time is shorter and the Egt at max power is lower so probably the thrust is up also!
During take off the lower spool up time is clearly evident.
Maybe it really needs more intake area or/and better ducting as i imagine that the hatch must distort the airflow in any case.
My opinion is that a custom duct should be made which will guide the air from the existing side openings to the mouth of the turbine
much like a split duct used with the EDF jets like the Sniper or a single duct to the turbine mouth like the EDF f16.
Chris
Hi.
It was your hatch intakes that i saw and decided to make additional intakes on my Boomerang also.
I also experienced a flame out during Take off when i programmed a smaller acceleration delay (perfectly working in the test stand for at least 20 tests)
so this got me thinking.
High spool up times during take off and flight also got me a little puzzled as the turbine was much faster in the test stand.
Without the hatch there was no problem so i figure out that i need more intake area.
The additional air intakes are also further front from the turbine intake and i think this is also very important.
I haven't measured the thrust because i fly with the throttle at 1/2 top and when i did used full throttle the vertical performance was
fantastic so it didn't crossed my mind, but the spool up time is shorter and the Egt at max power is lower so probably the thrust is up also!
During take off the lower spool up time is clearly evident.
Maybe it really needs more intake area or/and better ducting as i imagine that the hatch must distort the airflow in any case.
My opinion is that a custom duct should be made which will guide the air from the existing side openings to the mouth of the turbine
much like a split duct used with the EDF jets like the Sniper or a single duct to the turbine mouth like the EDF f16.
Chris
I absolutelly agree wit you about the air intakes. I think it´s a point, (the only point) to be upgraded in this plane. When I saw the air intakes the first day, they did not like, at all, but I thought, " if they works, ok".
I´m thinking about new air intakes, in order to have the same static thrust with and without cover.
10-17-2007, 12:18 AM
#2161
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RE: new Arf Boomerang 14lb thrust
When you retire the cover, the plane CG goes back, perhaps if you have the CG too back in your plane you can have problems if you loose the cover, making it difficult to fly.
10-18-2007, 12:10 PM
#2167
RE: new Arf Boomerang 14lb thrust
ORIGINAL: F-18DiamondBack102
An exercise in spacial relationships or "how to get 12 pounds of crap in a 10 pound bucket"...
Guys, just finished up a retro-fit of the baby. I am on 2.4 now and I have added some additional equipment to facilitate this as well as improve overall use-ability of the systems. I have the following installed:
Smart fly power expander
Smart Fly Turbo regulator
I4C volt meters
BVM fill valves
Pressure gages
Spectrum 2.4ghz system
3 LiPo batteries to power everything
As well as all the usual stuff you have to have (brake valves, air reservoirs, Etc...)
FYI, I am running a Behotec J66 and a 2000ml tank....
Here are some pictures...what you think?
An exercise in spacial relationships or "how to get 12 pounds of crap in a 10 pound bucket"...
Guys, just finished up a retro-fit of the baby. I am on 2.4 now and I have added some additional equipment to facilitate this as well as improve overall use-ability of the systems. I have the following installed:
Smart fly power expander
Smart Fly Turbo regulator
I4C volt meters
BVM fill valves
Pressure gages
Spectrum 2.4ghz system
3 LiPo batteries to power everything
As well as all the usual stuff you have to have (brake valves, air reservoirs, Etc...)
FYI, I am running a Behotec J66 and a 2000ml tank....
Here are some pictures...what you think?
Power Expander Sport
Turbo Regulator
2 Fromeco Batteries for RX
1 lipo for turbine
JMP fill valves (picture shows BVM but I switched to JMP)
Pressure gauges
Futaba RX
Hi-Tech servos
UP6 Brake valve
JMP Air Accumulator (UAT)
10-18-2007, 12:24 PM
#2168
My Feedback: (2)
RE: new Arf Boomerang 14lb thrust
Hi.
I like it very much.
It is till i think too crowded but that's a neat installation.
Btw i see you have the aluminum Fadec so did you used kerostart?
If yes with what turbine and were you happy with it's performance?
I am toying with the thought of adding kerostart especially since i am forced to use big 4500mah packs for weight.
Chris
I like it very much.
It is till i think too crowded but that's a neat installation.
Btw i see you have the aluminum Fadec so did you used kerostart?
If yes with what turbine and were you happy with it's performance?
I am toying with the thought of adding kerostart especially since i am forced to use big 4500mah packs for weight.
Chris
10-18-2007, 12:31 PM
#2169
RE: new Arf Boomerang 14lb thrust
ORIGINAL: hendrix
Does anybody knows how much pressure it is safe to put in to the air tank for the brakes?
I have never used air brakes before and the common air tank doesn't look very strong (more like a normal spray can)
Chris
Does anybody knows how much pressure it is safe to put in to the air tank for the brakes?
I have never used air brakes before and the common air tank doesn't look very strong (more like a normal spray can)
Chris
10-18-2007, 03:47 PM
#2172
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RE: new Arf Boomerang 14lb thrust
Hendrix,
I have a Jet Cat P-60 with kero start in it. I have flown the engine that way since new this past spring. The engine has about 40 starts on it without a failure. The start takes a few seconds longer than with gas, but works well.
Greg
I have a Jet Cat P-60 with kero start in it. I have flown the engine that way since new this past spring. The engine has about 40 starts on it without a failure. The start takes a few seconds longer than with gas, but works well.
Greg
10-18-2007, 03:55 PM
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RE: new Arf Boomerang 14lb thrust
Hendrix,
Sorry meant to pass this on also.
Per Spring Air, they recommend 80-90 psi for the pressure in the retract system's tank. I also run my brakes off this same tank.
In regards to the kero start. I have been averaging 450 mah for each kero start and 8 minute flight out of a 3000mah nicad.
Greg
Sorry meant to pass this on also.
Per Spring Air, they recommend 80-90 psi for the pressure in the retract system's tank. I also run my brakes off this same tank.
In regards to the kero start. I have been averaging 450 mah for each kero start and 8 minute flight out of a 3000mah nicad.
Greg
10-18-2007, 04:46 PM
#2174
My Feedback: (2)
RE: new Arf Boomerang 14lb thrust
Great thanks.
I am thinking of fitting kero start also in the near future so it is good to know that it works well.
From all the responses i took i now know that i can fill the tank with 100psi (~7bar) safely.
I hate to imagine the air tank exploding in the plane or near me.
Chris
I am thinking of fitting kero start also in the near future so it is good to know that it works well.
From all the responses i took i now know that i can fill the tank with 100psi (~7bar) safely.
I hate to imagine the air tank exploding in the plane or near me.
Chris