RE: Its Bobcat nice

RE: Its Bobcat nice
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RE: Its Bobcat nice - 1/9/2008 6:47:47 PM

opjose

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From: Poolesville, MD, USA
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quote:

ORIGINAL: z06kal

How bad was your negative incidence? Ie difference in inches between mains and nose?

I never really meaured, and since the gear differ in length the only way to get something accurate would be with an incidence meter.

I believe it was about -2 degrees or so, though.

Now I have about 2-3 degrees of positive incidence.

Change your incidence. Make it positive.

While you may want to avoid making the change, you'll be glad you did.

< Message edited by opjose -- 1/9/2008 6:50:05 PM >

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Post #: 476

RE: Its Bobcat nice - 1/9/2008 7:16:01 PM

AGR413

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I must have a different plane lol I don't touch the elevator and at speed mine will lift up into the ground effect and I then apply elevator. Go figgur?

< Message edited by AGR413 -- 1/9/2008 7:23:29 PM >

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Post #: 477

RE: Its Bobcat nice - 1/9/2008 7:20:00 PM

opjose

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quote:

ORIGINAL: AGR413

I must have a different plane lol I don't touch the elevator and at speed mine will lift up into the ground effect and I than apply elevator. Go figgur?

At what incidence?

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Post #: 478

RE: Its Bobcat nice - 1/9/2008 7:22:56 PM

AGR413

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Positive nose incidence of course, I was thinking of FBD's reply when I typed that.

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Post #: 479

RE: Its Bobcat nice - 1/9/2008 7:25:03 PM

Flyboy Dave

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From: San Bernardino County, CA, USA
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....wierd. Even though I have mine is nose high and balanced, and I still must pull lots
of "up" to get it airborne.

Most of them need 1/8" "up" trim in the elevator as well for level flight. So maybe the
wing has negative incidence relative to the horiz. stab. The nose high "angle of attack"
is off-setting the negative incidence in the wing ???

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Post #: 480

RE: Its Bobcat nice - 1/9/2008 7:30:32 PM

Flyboy Dave

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quote:

ORIGINAL: AGR413

Positive nose incidence of course, I was thinking of FBD's reply when I typed that.

....you're talking about the angle of attack, with a nose high attitude.

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An engineer says.... "That won''t work".
A mechanic says..."Oh yeah, watch this".
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Post #: 481

RE: Its Bobcat nice - 1/9/2008 7:43:16 PM

opjose

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Mine will fly level with the trailing edge of the elevator, level with the top trailing edge of the horizontal stabilizer... or just beyond that.

However relative to the fuse it appears that I have some positive incidence to the wing.

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Post #: 482

RE: Its Bobcat nice - 1/9/2008 8:25:20 PM

AGR413

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quote:

ORIGINAL: Flyboy Dave

quote:

ORIGINAL: AGR413

Positive nose incidence of course, I was thinking of FBD's reply when I typed that.

....you're talking about the angle of attack, with a nose high attitude.

Yes professor FBD postive angle of attack with the nose gear fully extended.

My elevator is within 1/16-1/8 of being level with the top of the elevator at neutral. Balance is at 10.3-10.5 aft of leading edge meeting fuselage measured right side up (not upside down). I know I know. Mine is right on the margin for CG, if it gets started going up it wants to keep going up but displays no other bad behavior which is no big deal because this plane should be "flown" everywhere it goes anyway. There may be a motor incidence issue in there somewhere to but I'm not going to go digging it flies just fine. However those of you that came up with the spoileron solution my hat is off to you. I have many many flights now with the spoilerons and I am one happy camper. No more "O GOD ITS TIME TO LAND THIS BEAST" I on the switch just before I reach the end of the runway and flare just before touchdown (looks just like I know what I am doing, even though I don't shhhhhhh)

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Post #: 483

RE: Its Bobcat nice - 1/9/2008 8:31:35 PM

Flyboy Dave

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Maybe they all vary....I'll check mine and see where it's at.

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A mechanic says..."Oh yeah, watch this".
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Post #: 484

RE: Its Bobcat nice - 1/9/2008 8:36:35 PM

AGR413

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I was waiting for your reply, I think the mounting of the booms (which affects elevator incidence) is very subjective on this plane. The tips of my booms don't sit flush on the wing (very slight gap) but the rest of the boom sits snug on the wing, this seemed intuitively more correct to me. Maybe this plays a role as well. The relocation of your landing gear may (may) play a role as well?

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Post #: 485

RE: Its Bobcat nice - 1/9/2008 8:58:16 PM

opjose

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quote:

ORIGINAL: AGR413

No more "O GOD ITS TIME TO LAND THIS BEAST"

That succintly describes landing the plane w/o spoilerons!

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Post #: 486

RE: Its Bobcat nice - 1/9/2008 10:04:21 PM

z06kal

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Okay I redid my retracts. Unfortunately I had to cut a slot in the nose wheel wheel well for the wheel to go down further. Oh welp more cooling for the 3.5 pounds of batteries LOL. Right now my nose wheel is about 3/4" longer than my mains. Is this the ammount of up incididence I want or more or less?

< Message edited by z06kal -- 1/9/2008 10:05:01 PM >

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Post #: 487

RE: Its Bobcat nice - 1/9/2008 10:25:14 PM

opjose

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As long as the wings sit either level with the ground or the leading edge is higher than the trailing edge you'll do fine.

Remember that this is along the wing chord.

Add spoilerons too! You need them with this plane.

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Post #: 488

RE: Its Bobcat nice - 2/12/2008 4:25:33 AM

bettungesvik

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From: Piedmont, SD, USA
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Hey guys, I have an OS .75 I was thinking about throwing on my Bobcat. What do you think?

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Post #: 489