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RE: BOOMERANG ELAN - New Build & Setup Thread! - 6/6/2012 3:44 PM   
mjunior


 

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From: Sao Jose dos CamposSP, BRAZIL
Status: offline 		Mike,

It seems to me there is nothing different that could lead to a heavier tail. I think I may be oscilation in the production process. There are details I noted! I needed to add that weight to get the CG at 25cm as stated in the manual. In fact, to move the CG backwards as we have discussed previously that weight will be possibly removed.

One more thing. Without the weight and with my robart straight struts (ground rotation point maybe 1" ahead than pro-link struts) the nose was slightly leaving ground. Therefore I may have a model already balanced with no extra weight to the nose if I consider a CG at 24cm or 23cm (from de LE).

Mucio

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RE: BOOMERANG ELAN - New Build & Setup Thread! - 7/10/2012 3:13 AM   
mjunior


 

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From: Sao Jose dos CamposSP, BRAZIL
Status: offline 		After a long waiting a short movie.

Great sport jet.

http://youtu.be/drUC3fIdL-4

< Message edited by mjunior -- 7/11/2012 3:33 AM >

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RE: BOOMERANG ELAN - New Build & Setup Thread! - 7/10/2012 6:37 AM   
Dave Wilshere


 

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Great, I am happy you have flown the Elan successfully.

Dave Wilshere

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RE: BOOMERANG ELAN - New Build & Setup Thread! - 7/10/2012 11:07 AM   
BaldEagel



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Congratulations on a successful flight, how was your C of G setting?

Mike

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RE: BOOMERANG ELAN - New Build & Setup Thread! - 7/10/2012 11:39 AM   
Justflying1


 

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quote:

ORIGINAL: petera38

Put  the second flight on my Elan on Saturday.
I´m not real comfortable with it, kind of "nervous" airplane....needs your attention all the time!
When I came back home, I did another balancing. Noticed that it was rather noseheavy...C of G was in front of Alan´s 25 cm from the trailing edge.
Moved my reciever batteries (2 x LiPo) to the back of the tank...and put the C of G back to 24 cm from the T.E.

Now it´s interesting to see if that helped...?

/Pete




Sorry to say but if you are not comfortable flying the Elan well I think you better have a break from flying jets and practice a little more flying prop planes.
Try flying something like a war bird which has Flaps and retracts before moving to Jets.
The Elan is a dream to fly, and whether  it is a little nose, or tail heavy its easy as to fly. 
Not putting you down just some friendly advise. It will make you a better flyer.










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RE: BOOMERANG ELAN - New Build & Setup Thread! - 7/10/2012 12:33 PM   
mjunior


 

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quote:

ORIGINAL: petera38

Put  the second flight on my Elan on Saturday.
I´m not real comfortable with it, kind of ''nervous'' airplane....needs your attention all the time!
When I came back home, I did another balancing. Noticed that it was rather noseheavy...C of G was in front of Alan´s 25 cm from the trailing edge.
Moved my reciever batteries (2 x LiPo) to the back of the tank...and put the C of G back to 24 cm from the T.E.

Now it´s interesting to see if that helped...?

/Pete


Pete,
I have 7 flights in my Elan. After around 80 flights in my Sprint I felt the Elan different in the first flight and made me a bit scared.
Then I did two important things. Reduced the ailerons travel (to 60% from total) and increased expo to 35%.
Also, in the second flight I flew it around 40-50% thrust.
After that, what a pleasant flier..... solid and predictible.
Of course, the Elan is a Sport jet but still very relaxing jet.

Mucio

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RE: BOOMERANG ELAN - New Build & Setup Thread! - 7/10/2012 12:36 PM   
mjunior


 

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quote:

ORIGINAL: BaldEagel

Mucio

Congratulations on a successful flight, how was your C of G setting?

Mike


Mike,

It is around 24cm from TE. Since I have straight main struts, without fuel my Elan almost 'sits on ground' over the main landing gear.

Mucio

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RE: BOOMERANG ELAN - New Build & Setup Thread! - 7/10/2012 11:24 PM   
BaldEagel



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Status: offline 		I know that is what you have, I just wondered how you found it as you where flying, did you feel it was nose heavy or tail heavy? I moved the C of G a long way back from the recommended, in fact the tail sat on the ground and did not move back onto the main wheel, this I found the be the sweet spot for me.

Mike

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RE: BOOMERANG ELAN - New Build & Setup Thread! - 7/11/2012 3:37 AM   
mjunior


 

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quote:

ORIGINAL: BaldEagel

I know that is what you have, I just wondered how you found it as you where flying, did you feel it was nose heavy or tail heavy? I moved the C of G a long way back from the recommended, in fact the tail sat on the ground and did not move back onto the main wheel, this I found the be the sweet spot for me.

Mike



Mike,

After finished it was balanced at 25cm. I flew twice and no problems but lots of trim up. Then I added some few weight to the booms (around 50 grams) and then the CG moved to 24cm. Also added a 2mm shim to the backwards horizontal stab screw. I flew it again and it remained good and no more trim up.

Mucio

Now the movie is ok http://youtu.be/drUC3fIdL-4

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RE: BOOMERANG ELAN - New Build & Setup Thread! - 7/11/2012 11:00 AM   
BaldEagel



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Status: offline 		Mucio

All sound very familiar, I moved my batteries after the first flight, the three cell A123 ECU battery was in between the wheel wells and the two 2 cell A123 Rx batteries where under the tank, did not need to shim the tail, but moving the C of G back made it all very neutral in handling, enjoy your new toy.

Mike

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RE: BOOMERANG ELAN - New Build & Setup Thread! - 7/11/2012 11:30 AM   
Xairflyer



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Status: offline 		I think the shimming is a compromise on how far back you go with the CG, I shimmed the last three I built and balanced it by basically hanging it upside down from the main gear.

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RE: BOOMERANG ELAN - New Build & Setup Thread! - 7/11/2012 11:38 AM   
BaldEagel



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Status: offline 		Your not wrong, but hanging it upside down by the gear would tend to straighten a trailing link leg gear and so move the theoretical C of G forward, having a trailing link gear airframe on the ground would tend to compress the gear and move the C of G backwards if assessing the C of G by putting the airframe on its booms, I am sure someone will point out the angle of rotation about the gear will also have an effect. LOL

Would be interested to know where the C of G ended up on the hanging Elan? if you know, I have no idea where mine ended up in dimension, just that it flew very well when the booms sat on the ground.

Mike

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RE: BOOMERANG ELAN - New Build & Setup Thread! - 7/11/2012 11:44 AM   
Xairflyer



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Status: offline 		Didnt mean using the actual Gear mike but in that position on my goldberg CG machine

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RE: BOOMERANG ELAN - New Build & Setup Thread! - 7/11/2012 11:48 AM   
BaldEagel



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Status: offline 		Ahhhh all becomes clear.

After using your Goldberg devise did you try to sit any of the Elans on their booms/tail to give us an idea where the C of G was?

Mike

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RE: BOOMERANG ELAN - New Build & Setup Thread! - 7/11/2012 11:54 AM   
Xairflyer



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Status: offline 		Yes it was you that I got this from before for the first one, it will sit on its tail with no fuel, in fact the elan is one of the few sport jets with the gear in the correct place in regard to CG that is why they fly off the ground so well.

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RE: BOOMERANG ELAN - New Build & Setup Thread! - 7/11/2012 11:55 AM   
mjunior


 

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From: Sao Jose dos CamposSP, BRAZIL
Status: offline 		I hung up mine also upside down in the booms.

If I move the CG far than it is today (and possibly remove the shim) it will not stay leveled on ground.... In fact the trailing links help to keep it leveled on ground.

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RE: BOOMERANG ELAN - New Build & Setup Thread! - 7/11/2012 12:39 PM   
BaldEagel



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Status: offline 		Have to admit it was not my original idea, It was suggested to me from the owner of Digitech in Norway, can't think of his name for the moment, getting too old for remembering. LOL

Mike

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RE: BOOMERANG ELAN - New Build & Setup Thread! - 7/11/2012 12:52 PM   
Lil Hoss



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Status: online 		Kinda disappointed in whats happening to the bottom of my Elan.
The bottom of my Elan is turning yellow due to the fuel vent.
I mean "BIG TIME". Another member in our club that flies a Torus has a worst problem than mine. The entire bottom is stained.
I no this doesn't bother other pilots much but it bugs the heck out of me.
I been flying Boomerangs for years and owned every type execpt the Torus.
My 2 XL's never stained yellow the way my Elan has. In fact,,,, No stains.
What's going on?? I do have many flights on my Elan but after the second flight it already had signs of staining.
I no we or I can't and won't go back to Boomerang and ask for a solution. I just hope that they can come up with a better clear finish.
The boomerangs to me are still the best flying jets on the market. But I like a "Good looking clean" model

Hoss

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RE: BOOMERANG ELAN - New Build & Setup Thread! - 7/11/2012 1:20 PM   
BaldEagel



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Status: offline 		Everyone has the same problem with a bottom vented Elan, the answer's we came up with are to vent out of the rear, or to turn the vent into the air stream almost like a pitot tube to give a little positive pressure into the pipe, the worst case is to have a vent flush with the underside, this causes a negative pressure across the vent and will suck fuel out of the tank.

Mike

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RE: BOOMERANG ELAN - New Build & Setup Thread! - 7/11/2012 1:30 PM   
Lil Hoss



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Status: online 		Thanks for replying Mike
As I said my buddy flies the Torus. He is vented out the rear and his looks worst than mine.
It really isn't a big deal.......
Perhaps come winter when there is nothing to do but watch the snow fall I will have the body shop repaint the fuse and put on the proper clear coat.
It's only cosmetic,,,,

Take care Mike

Hoss

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RE: BOOMERANG ELAN - New Build & Setup Thread! - 7/11/2012 1:48 PM   
mjunior


 

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ORIGINAL: Lil Hoss

Thanks for replying Mike
As I said my buddy flies the Torus. He is vented out the rear and his looks worst than mine.
It really isn't a big deal.......
Perhaps come winter when there is nothing to do but watch the snow fall I will have the body shop repaint the fuse and put on the proper clear coat.
It's only cosmetic,,,,

Take care Mike

Hoss


My winter project is fly, fly and fly... Thanks God

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RE: BOOMERANG ELAN - New Build & Setup Thread! - 7/11/2012 5:29 PM   
BaldEagel



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ORIGINAL: Lil Hoss

Thanks for replying Mike
As I said my buddy flies the Torus. He is vented out the rear and his looks worst than mine.
It really isn't a big deal.......
Perhaps come winter when there is nothing to do but watch the snow fall I will have the body shop repaint the fuse and put on the proper clear coat.
It's only cosmetic,,,,

Take care Mike

Hoss


If the bottom of his Torus's Fuselage is stained and the fuel vent's out of the rear of the fus, I can't see how it can be fuel staining? The staining on my Elan started at the vent under the fus and fanned out towards the rear of the fus, this was pretty clearly fuel staining, only stopped when I turned the vent around and pointed into the direction of flight, managed to remove the stain with Fibreshine its a fibreglass yacht cleaner, should be available from any yacht chandlers.

Mike

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RE: BOOMERANG ELAN - New Build & Setup Thread! - 7/11/2012 7:52 PM   
Xairflyer



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Status: offline 		You should'nt get any staining, air is meant to be going in the pipe not being blown out, if so, then as mike says, it must be getting sucked out due to pressure changes etc.
I normally have the pipe sticking out the bottom about 25mm and it seems to be ok, or on my Intro I have a metal pipe bent out the side again as Mike said like a pitot tube.

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RE: BOOMERANG ELAN - New Build & Setup Thread! - 7/11/2012 9:58 PM   
Lil Hoss



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Status: online 		Hey Mike
I will find some of the cleaner and possibly get some of the stainning off.
I just hope that the cleaner won't take the clear off.
As far as my friends Torus..... We looked at it again today and discussed the stainning on the bottom of his jet. His over flow exits out the rear just to the lower left of his turbine.
Yea,,,,,ya got me wondering why it stain it.. His is REALLY bad. Covers almost the entire bottom of the fuse. He does have several flights on his Torus but that is still no exuse for a poor clear paint job.
As I said in my other post. My 1st Boomer XL exited out of the bottom and never stained it.
My 2nd XL was never a issue either exiting out the bottom.
The only thing I can think of is that Boomerang has someone new doing the painting and clearing.
Still VERY happy with the Boomerang family

Hoss

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RE: BOOMERANG ELAN - New Build & Setup Thread! - 7/11/2012 11:20 PM   
BaldEagel



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Status: offline 		"The only thing I can think of is that Boomerang has someone new doing the painting and clearing."

That would not explain why all of the Elans I have seen since approx four/five years ago when I got mine have this staining on the underside where the fuel vent exits, as I said in the post above, this was common on Elan's in the previous Elan thread.

Mike

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