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new Arf Boomerang 14lb thrust

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new Arf Boomerang 14lb thrust

Old 01-03-2008, 09:28 AM
  #2376  
Fugitivo
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Default RE: new Arf Boomerang 14lb thrust


ORIGINAL: highhorse

Perhaps your nose gear is a bit too long? A slightly nose down attitiude will help "pin" it yo the runway after touchdown, preventing some of the bouncing you see when landing a bit too fast.

Just a thought.
Yes, I´m sure that the nose strut is too long but the problem is that I cannot unscrew the steering arm in order to shorten the leg lenght. I don´t know if the screw is in metric or inches but I´m not able to unscrew it with my metric allen. Anyway the bouncing happens even touching with rear main legs only, so I suppose the lenght of the nose leg is irrelevant in this case.
Thanks
Old 01-03-2008, 09:37 AM
  #2377  
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Default RE: new Arf Boomerang 14lb thrust

well that's some very rough surface you're flying from and if you can shorten the nose gear leg (which is metric) and get the nose down far enough to achieve a slightly negative angle of attack for the wing then it won't bounce back into the air. IMO
Old 01-03-2008, 11:50 AM
  #2378  
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Default RE: new Arf Boomerang 14lb thrust

OT but i think you will like it.
I am thinking pf getting this:
http://cgi.ebay.at/Jetkart-mit-APU-T...QQcmdZViewItem
It is the turbine i am after for a Boomerang XL
Chris

Old 01-08-2008, 05:37 AM
  #2379  
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Default RE: new Arf Boomerang 14lb thrust

Nice bit of sandblasting there,looks expensive
Old 01-09-2008, 05:52 AM
  #2380  
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Default RE: new Arf Boomerang 14lb thrust

Hi All
Does anyone here in the UK have spare one of the RS.Components 2 Litre bottles which were used as a tank way back in this thread.
They come as a pack of five bottles but are currently out of stock.
It is a 2 Litre HDPE bottle Part No. 461-0566.
Old 01-09-2008, 01:19 PM
  #2381  
Ayrtonsenna
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Default RE: new Arf Boomerang 14lb thrust

Make that two

cheers
Ants
Old 01-11-2008, 08:43 AM
  #2382  
hendrix
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Default RE: new Arf Boomerang 14lb thrust

As usual i have one more question for anybody who might know (i know that i am asking too many questions but turbines are very fascinating)
Here is a graph of my last flight's data, do the temperatures and the rest readings look normal or there is something suspicious in the graph?
The graph looks normal to me but i would like to hear any opinion.
Thank you all for your patience with my questions.
Chris

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Old 01-11-2008, 02:30 PM
  #2383  
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Default RE: new Arf Boomerang 14lb thrust

For those who are in search for a good brake valve i have the following news:
I just operated the new Jet-tronics no loss brake valve and it is excellent.
Braking is much more proportional than the older PWM valve and it only uses a very small quantity of air.
I never had any servo operated air brake valve so i cannot compare it with those valves like the UP6 but it looks proportional indeed to me.
The quality is very good and right now i left the tank full with no power in order to check for any long term air leaks from the valve and tubes.
I only used about 5 brake applications so far but the pressure remained almost constant (i measured it before and after) , this thing is as close to a no air loss valve as possible i think. It looks like i can now apply brakes many times without worrying of loosing the brakes because of low air pressure.
Service life remains to be seen but it looks like a very robust unit.
Update:
As i read the manual the valve needs some rules in order to work best, not that it is not working very well with my old settings but i can see that it can do better.
It needs that the air lines must be around 2m long (probably it uses them as an expansion chamber) and for best results a dedicated air tank for the brakes
(it says that this is not absolutely required but it enhances the brake operation) filled with just enough pressure in order to have maximum braking when the valve is at full brake position.
It is evident that he tries to expand the range from no brake to full brakes in order to enhance proportionality.
In any case i used my old setup with about 170cm of air lines and 8 Bar (i should use 6 Bar if i was following the recommendations)
of pressure and i was able to program the valve and get very good proportional braking.
It comes close to my hydraulic brakes in proportionality but hydraulic brakes are still better, not much but they are.
Of course with hydraulic brakes you can have a real mess in no time
I really like it[8D]
Chris
Old 01-11-2008, 04:52 PM
  #2384  
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Default RE: new Arf Boomerang 14lb thrust

Chris - what is the model no. of the jet tronics no loss brake valve?

Bob
Old 01-12-2008, 01:53 AM
  #2385  
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Default RE: new Arf Boomerang 14lb thrust

Hi.
It doesn't have a number on it nor in the manual.
You must go to Jet-tronics page and then click the Ventile tab.
It is the last valve in the lower right corner of the page.
http://www.jet-tronics.de/ and the click on "Ventile"
I think Al's hobbies also has them now.
I didn't saw them in his site but according to his words he should have them:
http://www.rcuniverse.com/forum/m_6820148/tm.htm

Chris
Old 01-13-2008, 11:49 AM
  #2386  
hendrix
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Default RE: new Arf Boomerang 14lb thrust

Ok today i had a couple more flights and i can verify that the brake valve is superb.
Along with the brakes and wheels from Intairco (i am sure that this apply to any wheel and brake)
the new brake valve is what it was missing for a perfect setup.
Braking is proportional and so smooth....
Air consumption is minimal and enough for at least 2 flights without a refill.
In fact i taxied the plane for over 500 feet (i found my self actually enjoying taxiing the plane)
and i could achieve the smoothest taxi ever easily.
I also left the brakes on for over 15 hours with power removed and the brakes did not lost air at all!!!
I am impressed and i can now safely say for anyone that needs a good brake valve to buy this brake valve!
Chris
Old 01-14-2008, 06:24 PM
  #2387  
Ed
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Default RE: new Arf Boomerang 14lb thrust

3 quick questions :

1 - Who has the best price on the Baby Boomer Intro in the U.S. ?

2 - How many square inches of wing area does it have ?

3 - Has anyone used it with a single nose wheel brake, such as the Kavan mechanical, or electromagnetic ? And how effective is it ?

> Jim

Old 01-14-2008, 08:24 PM
  #2388  
highhorse
 
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Default RE: new Arf Boomerang 14lb thrust

Boomerangjets.com is the ONLY dealer to my knowledge.

Read the Reaction 54 threads to see that the Kaven works fine. Don't remember seeing a reference to same w/ the Boomer, good question tho.

Must more than enuff area cuss everyone raves about it flying like a trainer should. Sorry, I don't have the specifics.
Old 01-15-2008, 01:21 AM
  #2389  
hendrix
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Default RE: new Arf Boomerang 14lb thrust

I have used the Boomerang intro with a Kavan brake in the nose wheel and i think that it will not work very well.
When i applied brakes the plane would steer to one direction and the braking was not that good but i can say it was adequate for stopping the plane
if you have 50 - 60 feet of runway to spare.
I think the best solution is to fit two of those brakes to the main wheels if you need to use the Kavan brakes.
Those brakes are heavy (60g each) but the wheels are in a position where they don't affect CG very much.
If i was building the Boomerang intro again on a tight budget (as usual in my case )
I would certainly fit two of those brakes to the main wheels and not one in the nose.
PS. i fly only from tarmac runway where the wheel friction is nearly zero. If you use a grass runway one Kavan brake in the nose is adequate
as you don't even need brakes in grass with this plane.
Have in mind that if you use one brake in the nose wheel you must center the wheel very well otherwise it will tend to steer to one
direction when you apply the brakes (on tarmac)
Chris
Old 01-15-2008, 08:18 AM
  #2390  
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Default RE: new Arf Boomerang 14lb thrust

the landing speed of the baby boomer is slow enough that it'll land without brakes just fine and have minimal roll out on concrete, the Kavan just keeps you 'legal' with the AMA regulation requiring a halt on demand. i fly from concrete and the only time i use my brakes are for high performance take off with smoke on, i have TamJet brakes and they do a great job holding back the P-70, the tires also have excellent ware resistance.
Old 01-15-2008, 10:41 AM
  #2391  
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Default RE: new Arf Boomerang 14lb thrust

the landing speed of the baby boomer is slow enough that it'll land without brakes just fine and have minimal roll out on concrete, the Kavan just keeps you 'legal' with the AMA regulation requiring a halt on demand. i fly from concrete and the only time i use my brakes are for high performance take off with smoke on, i have TamJet brakes and they do a great job holding back the P-70, the tires also have excellent ware resistance.
Hi.
I agree and i am aware that you need something like a brake to be legal in the US.
We don't' have this problem here we are all illegal
I need the brakes because my Boomerang can taxi and fly level with the turbine in idle so landings are a bit tricky.
Now that i know the plane well i can land in a 100 feet strip (from touch down) but i usually avoid it if there is absolutely no wind
I do like to brake hard during landing so my nose strut can compress and give this nose down attitude though
PS i had a couple plastic washers in the wheels in order to have some friction and this made the plane behave very well
without the need to apply any brakes at all, but now i removed them because i don't like the idea of having friction during touch down.
The new brake valve made it possible for me to control the plane during taxi easily.
Unfortunately this was the only turbine i could afford at that time (i am only having one turbine right now).
Chris
Old 01-25-2008, 02:58 PM
  #2392  
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Default RE: new Arf Boomerang 14lb thrust

Hi.
As i continue tinkering my Boomerang i decided to fit 4 M1 A123 cells (2S2P also gives some kind of added safety)
in order to power both the turbine and the receiver/servos with one pack.
All my calculations seem to be in order, the turbine and the receiver work ok so i will try it when the wind calms down.
The wind here is 9 beaufort so flying is too risky.
I have also fitted a DC filter between the power and the receiver which i made in my lab (both common and differential mode)
in order to avoid any interference from the ECU.
I switched the IPD filter off and the servos do not move which is encouraging.
I always hated having two batteries to charge and take care off.
Chris

Old 01-25-2008, 08:55 PM
  #2393  
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Default RE: new Arf Boomerang 14lb thrust

Does anyone know of a source of wing and boom bags for the BB?
Old 01-26-2008, 01:52 AM
  #2394  
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Default RE: new Arf Boomerang 14lb thrust

i think dreamworks has then in the Boomerang accessories section but i could be wrong.
I just checked and i am wrong but i am sure i saw them somewhere.
Why don't you contact Alan at http://alshobbies.com
Chris


Old 01-26-2008, 04:45 AM
  #2395  
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Default RE: new Arf Boomerang 14lb thrust


ORIGINAL: pfact

Does anyone know of a source of wing and boom bags for the BB?
If you do a quick search or even look backwards through the treads you will see one recently on this subject with several different suppliers and solutions.

Motors and Rotors have had some made up but others have used off the shelf bags.
Old 01-26-2008, 10:21 AM
  #2396  
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Default RE: new Arf Boomerang 14lb thrust

Thanks for the suggestions gentlemen.

A google search restricted to this forum doesn't return anything using the search words bag, bags, wing bag, wingbag, etc. Als Hobbies has bags for the Boomerang but not the Baby Boomerang.

Any other suggestions would be most welcome.

Phil
Old 01-26-2008, 10:31 AM
  #2397  
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Default RE: new Arf Boomerang 14lb thrust

You can go to your local music store (Guitar Center) and look in the keyboard section. You will find the right bag for less price and they are tough.
Old 01-26-2008, 10:35 AM
  #2398  
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Default RE: new Arf Boomerang 14lb thrust

all it takes is a bit of searching HERE, not google

http://www.rcuniverse.com/forum/m_66...tm.htm#6948744
Old 01-26-2008, 11:44 AM
  #2399  
kwb
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Default RE: new Arf Boomerang 14lb thrust


ORIGINAL: KC36330

all it takes is a bit of searching HERE, not google

http://www.rcuniverse.com/forum/m_66...tm.htm#6948744
Yep this is the one I was on about. Google!! everything you need is on here
Old 02-01-2008, 11:45 AM
  #2400  
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Default RE: new Arf Boomerang 14lb thrust

Good evening,
Does anyone would be kind enough to give me a foto of the center wing assembly, especialy the front part?. Do you stick the center wing with the fuselage. The instructions are not very clear.
Thanks

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