RE: new Arf Boomerang 14lb thrust  
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RE: new Arf Boomerang 14lb thrust - 3/2/2005 5:32:54 PM   
rcguy!



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Congrats! Thanks for the detailed first flight log. Glad to hear she handled well.

Dave Rigotti

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RE: new Arf Boomerang 14lb thrust - 3/2/2005 8:01:15 PM   
Gazzer



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Most excellent news, so it is feasible to have an ARTF model, with an ace pedigree done within a week? And that is taking some time and trouble.

All we want now is those twits at De Agostini magazines to market the product in their weekly magazine!!!

Great report, read so well I was with all the way, sorry about the landing mishap but sounds quite modest, unlike my usual landings.......!!

Glad your chuffed, awaiting the ringing out flight report with gusto!!!!

Gazzer

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RE: new Arf Boomerang 14lb thrust - 3/2/2005 8:22:36 PM   
DocYates



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Is there reason to consider beefing up the LG blocks, or do you think, like you said, it was just the rough field and short screw (no pun intended)?
Tommy

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RE: new Arf Boomerang 14lb thrust - 3/2/2005 8:26:01 PM   
TREADSTONE.



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Status: offline 		Nice stuff John... ....Sorry to hear about the Bovine Hoof thugs. ... done just the same myself.

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RE: new Arf Boomerang 14lb thrust - 3/2/2005 9:15:35 PM   
rorywquin


 

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Thanks for the report (obviously you have done this often - when I maiden a new plane, it is all a blur for me afterwards, so well done on the details of the flight). Very heartening news for a jet rookie like me - I still have to wait a few weeks for mine and will use the P-60 but I am really starting to get excited.

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RE: new Arf Boomerang 14lb thrust - 3/2/2005 9:22:16 PM   
rorywquin


 

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Any chance on details of servos, batterys and final weight.

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RE: new Arf Boomerang 14lb thrust - 3/3/2005 8:35:59 AM   
john agnew


 

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I will post a reply to your queries later this morning.

John

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RE: new Arf Boomerang 14lb thrust - 3/3/2005 9:06:54 AM   
john agnew


 

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In reply to Doc Yates I think the only beefing up you can do is increase the screw length. The recommended screws are far too small and are missing from the kit anyway! If you make the gear block too strong you risk braking the mounting rails instead which would be a much more difficult repair. You can see in pic 1 where the split happened. I will use 1 1/4" screws on the repair. I think I will fit retracts soon.

Pic 2 shows some aluminium tape as heat shielding at the back of the top hatch which is right over the tailcone. I have alco painted the inside of the fuz / hatch with epoxy resin thinned with about 20% acetone to fuel proof it. It has the added advantage of filling all the joints and should strengthen any weak glue joints which are fairly common in ARTF'S.

In reply to roryquin the final weight was 14lbs 10oz with a full hopper tank (6oz this is always full) 12 oz of lead in the nose in the nose gear compartment CG 175 mm back from the LE ( no problems with stability I feel the recommended CG of 150mm back is very conservative 25% of MAC would be 187mm and I intend to try this) With a P60 I would put the ECU battery in this compartment and you can probably reduce the lead content. Remember to mount you pump / solenouid /ECU as near the nose as possible. Servos are Hitec HS 5625 metal gear digitals on ail / elev. HS 5475 Karbonite gears on rudd.
and HS 625MG on flap / steering. This is probably overkill I believe Ali Machinchy is doing one with £10 servos on the flying surfaces and he should know!

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RE: new Arf Boomerang 14lb thrust - 3/3/2005 9:50:02 AM   
rorywquin


 

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Many thanks for the detailed reply.

On the U/c, do you think that the shorter (less flexible) legs may have contributed to the mounting block splitting?

Good advise on the epoxy coating. Is the heat shied ordinary aluninium ducting tape?

Can you tell me the servo count please.

It is hard to tell from pics but it looks like

1 - steering
1 - flap
2 - aileron
2 - rudder ??
1 - elevator ??

Thanks


Rory


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       Post #: 84

RE: new Arf Boomerang 14lb thrust - 3/3/2005 11:26:19 AM   
john agnew


 

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You could be right about the shorter legs, going out to try again today!

Your servo count is correct.

John

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RE: new Arf Boomerang 14lb thrust - 3/3/2005 11:46:35 AM   
rorywquin


 

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Look forward to the flight report!

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RE: new Arf Boomerang 14lb thrust - 3/3/2005 3:50:21 PM   
john agnew


 

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First of all I am self employed ( Architect) and therefore can elect to work when I like. You can't fly in the dark but you can work!

Today's story. Good flying day if a little cold. Wren as ever started within 15 seconds of igniting gas, rpm's dialled up to 160k this time,
Take off into wind , model off and climbing in 30 yards. Extra thrust immediately evident, flew rolls both slow and 4 point, loops, reversals, cubans etc. Very confident with model on only second flight, set up for landing, made what I thought was gentle touchdown and I heard the crack of the gear block breaking again, both blocks this time , no other damage to model but no more flying.

Conclusions: The model flies very well , no reservations about that, touchdown speed was about 20mph into 10mph wind.

The main landing gear is not up to the job. You might be ok if you fly off tarmac. The laminated plywood blocks need to be replaced with hardwood and the main legs need springs (same as noseleg) This I think has not been tested as all the models I have seen have retracts, maybe Alan Cardash can confirm? I am not going to continue with the fixed gear, anyway one of the guys said the model looked dorky with the gear hanging down! He's right jets should have retracts.

I have stripped everything out of the fuselage and am about to plan my retract installation. I will not use the forward retracting noseleg as shown in the plans as I have a spare flatmount springair noseleg. I will cut new 6mm ply formers to suit. THe main legs are simply screwed to the existing hardwood rails in the wings.

All new models need development and in my experience undercarts are the biggest problem in turbine models especially if you operate off grass. I will, of course, post progress reports and photographs of the new installation for my faithfull readers!

John


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RE: new Arf Boomerang 14lb thrust - 3/3/2005 7:43:59 PM   
john agnew


 

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Here is the nose retract mount framed up and ready for glueing and mounting in the model. May be a delay on completion as I ordered some springair bits and they are out of stock at Motors & Rotors and Mikes Models. Will have to wait a week or so.

Looks like the L39 will have to come out of hibernation as I am re-hooked on Jets!

John

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RE: new Arf Boomerang 14lb thrust - 3/3/2005 9:40:49 PM   
rorywquin


 

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quote:

ORIGINAL: john agnew

Rory

You can't fly in the dark but you can work!



I'm showing this to my boss tomorrow - I hope he is understanding !

Please forgive my question but, I thought tha retracts were more of a headache on rough ground than fixed u/c? Or, is it the mounting of the fixed u/c that is a problem? I think in my early stages, I will always be flying off a paved surface but would like to move on to retracts. Would it be better to simply fit them at the same time? Alan Cardash sells them for £160 a set!

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