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Flyeagle F18F

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Old 07-09-2010, 11:14 PM
  #1651
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Default RE: Flyeagle F18F

Slick 73

Great flying.. I liked the smoke on landing watching smoke curl up on each side.... What cg are you flying with....

David
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Old 07-10-2010, 02:19 AM
  #1652
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Default RE: Flyeagle F18F


Quote:
ORIGINAL: jetspud

Slick 73

Great flying.. I liked the smoke on landing watching smoke curl up on each side.... What cg are you flying with....

David
+1
I really like the smoke pattern created by the vortex.
Also what a fantastic light you have in OZ. Makes beautiful pictures and movies.
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Old 07-10-2010, 11:48 AM
  #1653
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Default RE: Flyeagle F18F

Hi Oli and David,

Oli you want the bad news, that was one of the bad weekends for weather and the sky colour with clouds and dust haze, at that flying field normally it's almost perfect.

David the CG I'm using and set up is 28%MAC which works out at about 180mm. From flying it I would have to say this is where it should be as there is no pitching up at slow speeds and inverted flight only needs a small amount of down elevator pressure.

The one thing I must say is that I have set up some crow braking mix with the landing flap ( about 6mm up Aileron ) which then only requires about 3.5% down elevator mix at full flaps to give you no pitch change when full flap is set.

Hope this helps you.

Chris

PS. After watching the video myself I also love the smoke at that point on landing approach, slow mow makes it even better.
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Old 07-10-2010, 03:28 PM
  #1654
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Default RE: Flyeagle F18F

Hi Chris
very impresive flight well done !I was going to use a simjet Nexus in mine and afther your flight I do think it would have done the job in it.
I have my F18 almost ready I just have to finish installing the single pipe set-up that I have gone for ,I am using a P200 in mine where is your CG in relation to this picture Fly-eagle are quoting 110 mm and you say 170 is this meassured at the same point ?

http://www.flyeaglejet.com/f181.875/F181.875cg.jpg

Regards

Andy
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Old 07-10-2010, 04:22 PM
  #1655
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Default RE: Flyeagle F18F

Hi Andy,

I think the picture you are looking at is from the manual for the 1/8.75 FA18, the 1/7 in the manual from FEJ its 170mm.
I'm using with the 1/7 scale 180mm for the CG, measured from the leading edge of the wing same as the pictures in the manual from FEJ.

As you can see with the CG at 180mm in the video its take-off and landings are all good and safe, with the FEJ CG it would be a little harder to rotate at T/O and be a little harder to slow down on landings.

Just remember that a CG of 28%MAC is good of all of the FEJ FA18's. To find this just measure from the leading ledge to the trailing edge at the root of the wing and then times it by 0.28 and that is the distance from the leading edge to the CG.

Hope this helps
Chris.
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Old 07-10-2010, 04:29 PM
  #1656
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Default RE: Flyeagle F18F

Thanks Chris
for your swift response I must have been looking at the wrong one everything going well I should have it ready week afther next

regards

Andy
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Old 07-10-2010, 04:56 PM
  #1657
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Default RE: Flyeagle F18F

Good luck Andy with it, it should fly really well with the P200 in it with single pipe. Should have great vertical.

I'm off now to fly mine some more should be a good day.

Chris
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Old 07-11-2010, 01:36 AM
  #1658
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Default RE: Flyeagle F18F


Quote:
ORIGINAL: Slick 73

Hi Andy,

I think the picture you are looking at is from the manual for the 1/8.75 FA18, the 1/7 in the manual from FEJ its 170mm.
I'm using with the 1/7 scale 180mm for the CG, measured from the leading edge of the wing same as the pictures in the manual from FEJ.

As you can see with the CG at 180mm in the video its take-off and landings are all good and safe, with the FEJ CG it would be a little harder to rotate at T/O and be a little harder to slow down on landings.

Just remember that a CG of 28%MAC is good of all of the FEJ FA18's. To find this just measure from the leading ledge to the trailing edge at the root of the wing and then times it by 0.28 and that is the distance from the leading edge to the CG.

Hope this helps
Chris.
Hi Chris, just a small correction to what you said: the MAC is not at the wing root on the F-18F and neither on most aircraft anyway. So what you are really referring to is a position relative to the root chord.
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Old 07-11-2010, 04:08 AM
  #1659
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Default RE: Flyeagle F18F

ash u dont want to be setting the c/g at 110mm if its the 1/7 scale i have set mine to 180mm like oli said for the first flights.I have a merlin 160 in mine they are suposed to push out 38lb and i wont be filling the fuel tanks full it holds alot so we will see just waiting for a good day. Having problems with the air rams on the gear doors dont hold air so i will be changing them soon
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Old 07-11-2010, 04:53 AM
  #1660
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Default RE: Flyeagle F18F

Hi Alanjets,

I replaced all mine with airpower rams, including the speed brakes and canopy locks and the canopy large raise and lower one.
If you can put the canopy on a separate air tank and make sure it doesn't loss pressure. No pressure on the locking rams and the canopy will open inflight, not good for the day out flying a great bird....

180mm CG is perfect and the main tank should be enough for the 160 without using the saddle tanks, say about a 5min flight time.

Good luck with the test flight.
Chris
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Old 07-12-2010, 03:39 AM
  #1661
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Default RE: Flyeagle F18F

hi chris

can u remember what the sizes of the rams u ordered for the gear doors are they the all the same as its all ready to go. It would be a big help not having to take it all apart to get at them

cheers Alan
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Old 07-12-2010, 04:37 AM
  #1662
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Default RE: Flyeagle F18F

Hi Alan,

This is what I ordered from Airpower,
2 x 1/2", 4 x 3/4, 5 x 1", 2 x 1-1/4"
And 1 x 7/16" x 2" Ultra Precision Ram for Canopy.

The only ones I changed were the 2 under the engine as from FEJ they are very long but have a short stoke, so I mounted them on the bottom of the fuz not the former, which worked well and made the bypass fit much better and also gave more room for the air lines.
The other 2 where the speed brakes as I did not like how FEJ had them mounted so I mounted them back towards the front of the fuz which then gave me room to place the fuel pump and smoke pump under each of the speed brakes.

Hope this helps you.
Chris
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Old 07-13-2010, 11:36 AM
  #1663
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Default RE: Flyeagle F18F

cheers chris
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Old 07-25-2010, 01:56 PM
  #1664
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Default RE: Flyeagle F18F

hi guys took her to the runway today and the wind was straight down it perfict,got it lined up and off we go.Stuck to the runway like glue was on the wheels even with full up it was not going to lift the wheel.think i need to rase the nose gear abit. will keep u all informed
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Old 07-26-2010, 04:16 AM
  #1665
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Default RE: Flyeagle F18F

Hi Alan,

I placed a 6mm block of ply under the retract frames on the nose wheel and reduced the large spring length on the main legs, to get the mains to sit lower on the ground when under load, in doing this mod to the springs I also reduced the size of the plastic spacers between the large spring which made the angle on the main leg greater but still gave me the spring compression to give me the damping I needed to be happy with.

You don't do any changes to the smaller but longer spring in the mains leg as its needed to extend the leg as straight as it can to fit through the gear doors in the retract moment.

Both these changes and mod's gave me the slightly high nose up attitude I was looking for, as you can see from the video the amount of up elevator needed to rotate is not that great and only need for a brief second, I have flown it now at 2 flying fields both on grass and the result is the same and I would like to think it will be the same on tar.

Hope this gives you some ideas.

Cheers and good luck
Chris
www.youtube.com/watch
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Old 07-26-2010, 02:41 PM
  #1666
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Default RE: Flyeagle F18F

cheers chris the f18 that u have was it an older kit with the upgraded parts to widen the undercarrage or was it allready done at the factory.because the upgraded parts lower the undercarrage quite alot wished i had of done the mod that oli has done now. U wouldnt beleve how fast it was going along the runway it was a little dot by the time it stoped
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Old 07-26-2010, 06:04 PM
  #1667
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Default RE: Flyeagle F18F

Hi Alan, your heart must've been going at Mach 1 by the time it stopped also I guess????

Mine is the new version from the factory, I've left the mounting points alone and are standing up to the grass pounding well, so I have't done any of Oli mod's, only two things I've done is what I said in the last post was the springs and the ply under the nose retract.

It is a little bit of a pain in the butt, but doing the mod on the springs it gives you a much better and softer compression on the rear legs and you can compress them a lot further than you can from factory, this is because the plastic stoppers that hold the larger spring go to far up the inside of the spring and limit the compression stroke. Just take the C-Clips off the shock mounting points take the shock the the bench and unscrew the top of it and have a look at what I mean, I also cleaned this out of the oil the factory used and replace the oil with some good quality silicon car shock oil.

Have fun Chris D
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Old 07-27-2010, 10:17 AM
  #1668
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Default RE: Flyeagle F18F

Alan,

Look at this [link=http://www.rcuniverse.com/forum/m_7749224/mpage_62/key_/tm.htm]page[/link] post #1537. I mentioned that if you do the update as Fly Eagle sent them the F18 will be higher on the mains.

Regards

Joseph
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Old 07-27-2010, 10:52 AM
  #1669
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Default RE: Flyeagle F18F

Guys, don't compare the old kits with the newer versions. I think that FEJ worked again on the gear geometry and what Chris says is only valid for new kits.

Alan, you don't want to implement the FEJ gear "upgrade" because your plane is going to sit even more nose down on the runway ,as Joseph rightfully said.
What you can do at a first stage is to extend the nose gear as much as you can and lower the mains a little bit by cutting some of the short spring. Also take into account that the spring is a piece of hand coiled Chinese steel wire that will rapidly soften and loose it stiffness. So the plane is going to sit lower on the mains with the time. You can help the process a bit by "pumping" the plane up and down on the ground.
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Old 07-27-2010, 04:18 PM
  #1670
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Default RE: Flyeagle F18F

today i maden mine. it is one of the first 10 kits sold by james.
thanks Oli for the tips and tricks.

i upgrade the gear and lengthen the frontleg by 15mm.
cg at 180mm
flaps-start 25
flaps-ldg 30degrees
elevator up55 down40
aileron25
rudder 15mm
a gyro on frontwheel
filling the tires with 2comp silicone
amt olympus with straight tube

i only can say- perfect day
the gyro on wheel is given straight runs. no jump on rotation. aproach with nice adjust of aoa.

Uwe
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Old 07-27-2010, 04:50 PM
  #1671
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Default RE: Flyeagle F18F

fasteddi where was the start point for the elivator
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Old 07-28-2010, 02:08 AM
  #1672
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Default RE: Flyeagle F18F

on thursday i am back at the hangar- i will make a picture than.

Uwe
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Old 07-28-2010, 05:52 AM
  #1673
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Default RE: Flyeagle F18F

You're welcome Uwe,

Enjoy the model...
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Old 07-28-2010, 09:28 AM
  #1674
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Default RE: Flyeagle F18F

Uwe,

Please show pics of how you rigged the straight pipe.

Congrats on your Maiden.


Kevin
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Old 07-29-2010, 08:29 AM
  #1675
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Default RE: Flyeagle F18F

ok, here are the pictures.
elevator, no flaps- with flaps just 2-3 klicks down. thats metric mm!!!

Uwe
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