RE: FOCUS II ARF construction by-the-numbers

RE: FOCUS II ARF construction by-the-numbers
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RE: FOCUS II ARF construction by-the-numbers - 8/21/2004 3:14:34 AM

Don Szczur

Posts: 944
Joined: 1/6/2002
From: Chantilly, VA, USA
Status: offline

Yes I left mine with the uneven spacing. It flies great with what is put in as you have it. Whats a good airline to fly into Aruba?

(in reply to Aruba_Maverick)

Post #: 176

RE: FOCUS II ARF construction by-the-numbers - 8/21/2004 3:36:56 AM

Pattern freak

Posts: 120
Joined: 10/4/2002
From: Oranjestad, ARUBA
Status: online

Hello,Mr Don

Thanks for the info, i will let it like it is.

I will send a PM.

(in reply to Don Szczur)

Post #: 177

RE: FOCUS II ARF construction by-the-numbers - 8/21/2004 3:41:07 AM

Jorgele

Posts: 51
Joined: 12/15/2003
From: CALI, COLOMBIA
Status: offline

Hello Gregory, nice plane.

I hope the focus will fly great.

Saludos viejo

Jorge Lozano

(in reply to Pattern freak)

Post #: 178

RE: FOCUS II ARF construction by-the-numbers - 8/21/2004 4:02:12 AM

Pattern freak

Posts: 120
Joined: 10/4/2002
From: Oranjestad, ARUBA
Status: online

What`s up man,

Thanks for those kind words,sure it was a nice plane

I hope too,

Saludos hermano.

Gregory Winklaar.

(in reply to Jorgele)

Post #: 179

RE: FOCUS II ARF construction by-the-numbers - 8/21/2004 4:05:16 AM

Aruba_Maverick

Posts: 194
Joined: 9/29/2002
From: Oranjestad, ARUBA
Status: offline

Hey Gregory

Stop japping and finish your Focus II so I can test fly it for you

C Lim

(in reply to Pattern freak)

Post #: 180

RE: FOCUS II ARF construction by-the-numbers - 8/21/2004 4:12:33 AM

Pattern freak

Posts: 120
Joined: 10/4/2002
From: Oranjestad, ARUBA
Status: online

What`s up Chong,

No problem,sunday you`ll fly it for me i thrust you

.

Greg Winklaar.

(in reply to Aruba_Maverick)

Post #: 181

RE: FOCUS II ARF construction by-the-numbers - 8/21/2004 4:13:39 AM

Bob Hartwig

Posts: 82
Joined: 3/23/2003
From: Portage, WI, USA
Status: offline

Here is another Focus II. This one was built and covered by Dave Guerin.
Weight is 10 lbs even.
Webra 1.60
JR 10x Radio

Attachments

Click to see fullsize image.

Click for fullsize

(in reply to Jorgele)

Post #: 182

RE: FOCUS II ARF construction by-the-numbers - 8/21/2004 4:14:31 AM

patternrules

Posts: 545
Joined: 7/28/2002
From: Nineveh, IN, USA
Status: offline

Don are you saying that the 2 panels have different incedence?

quote:

ORIGINAL: Don Szczur

Flew the airplane last night.

Here is the detail.

Like all the Focus aircraft that I have flown, this one requires two turns of negative incidence in the left wing. That comes out to about an eighth inch. Upright and inverted spin entries and inverted flight were very stable after this change. This incidence change also brough the ailerons back on center.

I noticed a styrofoam sound when bringing the plane back from its second flight. Apon inspection, I found the small dowels that hold the wing retainer screws were loose and when flexing the wing, looked like they were trying to pop out some.

After an hour of poking, bending, looking and pondering. I took a knife to the wing. After pulling the white covering off up to the wing screw. I cut a small V shaped hole and after moving the (very lightweight) foam out of the way, noticed there was about 1/16 inch gap from where the wing tube socket plugs in to the false rib. I poured a few dabs of 5- minute epoxy in there, let it run down along the gap to fill it in order to provide a strong bond. Then ironed the covering back in place. Tonight the plane flew a few more times and the wing is nice and strong with no movement.

How does it fly? I'll tell you after the NATS.

I'll attach a picture if it comes through, with details on the repair.

Don

(in reply to Don Szczur)

Post #: 183

RE: FOCUS II ARF construction by-the-numbers - 8/21/2004 4:22:38 AM

Pro pattern

Posts: 354
Joined: 4/19/2003
From: Savaneta, ARUBA
Status: offline

Well finally I’m getting there.
This Sunday I’m planning to break in my Webra.
Hope to fly it soon.
Still need some minor work to be done to get it ready to fly.

So Greg, are you going to get yours done so I can see it fly.
So which one of these 2 FOCUS are going to fly first. Ha .

Danny

_____________________________

Nobody is perfect, I’m nobody
3rd place, is just 2nd best loser

(in reply to patternrules)

Post #: 184

RE: FOCUS II ARF construction by-the-numbers - 8/23/2004 3:19:09 AM

Don Szczur

Posts: 944
Joined: 1/6/2002
From: Chantilly, VA, USA
Status: offline

Yes, incidence is different and the plane flies exceptionally well. My focus 1 1/2 is exactly the same situation. It flies very well also.

Here is how you check the incidence. Fly with the ailerons trimmed for level flight, cruise speed. Next, cut the thottole, as if to enter a spin. See which way the plane starts to drift. Mine (when entering from right to left) would roll off to the left slightly.

When inverted, do the same. Going right to left with wings level, cut the trottle and add down elevator to keep level, as in approaching a stall entry to spin. Again, it turns in (to the left).

Add negative incidence to the left wing. Then add in right aileron trim to re-trim during cruise speed.

Do the opposite if its turning out.

Thats it.

Don

(in reply to Pro pattern)

Post #: 185

RE: FOCUS II ARF construction by-the-numbers - 9/20/2004 1:03:57 AM

Pro pattern

Posts: 354
Joined: 4/19/2003
From: Savaneta, ARUBA
Status: offline

Hello everyone,

Now my engine is coming @, but now I have an other huge problem.
The Hole stab is fluttering, very baldly. It seam’s like a bird wing when flapping.
Don’t know why…
Everything is looking ok.
There is only a minor play, but everything else is fine.
I’ve even trim-seal the gaps.
When I’ve look at it at the ground, it seems very stiff.
The only thing I could ( We, some other friend’s at my flying field ) think of is that
the elevator push-rod is vibrating and is the cause of this problem.

Anyone else have this problem.

This is my set-up :
Plane: Focus II
Engine: Webra 160 XP with MC-Carb.
Fuel: Morgan’s Cool-power 10%
Prop: APC 17X12 Pattern
Servo: on the elevator JR 8411 SA

I’m thinking of putting a piece off styro Foam to help reduce the vibration.
Could this be the answer.

Thanks a lot in advance for the help, Suggestions. It will be greatly appreciated
Danny Koolman,

_____________________________

Nobody is perfect, I’m nobody
3rd place, is just 2nd best loser

(in reply to Don Szczur)

Post #: 186

RE: FOCUS II ARF construction by-the-numbers - 9/20/2004 1:13:10 AM

Jeff-RCU

Posts: 331
Joined: 3/8/2002
From: columbus, IN, USA
Status: offline

Mine was fine untill I crashed and repaired the fuselage. Now my stab flutters also. I'm sure it's because I've lost the center support for the pushrod during the crash and I never paid attention untill I noticed the stab fluttering.

(in reply to Pro pattern)

Post #: 187

RE: FOCUS II ARF construction by-the-numbers - 9/20/2004 1:47:15 AM

Pro pattern

Posts: 354
Joined: 4/19/2003
From: Savaneta, ARUBA
Status: offline

Hello Jeff-RCU,

I haven’t done that. A center support, or a support some where in the fuselage to help
reduce the vibration.
Could this be the solution …. ???

Thanks in advance for the help suggestions. It will be greatly appreciated
Danny Koolman

_____________________________

Nobody is perfect, I’m nobody
3rd place, is just 2nd best loser

(in reply to Jeff-RCU)

Post #: 188

RE: FOCUS II ARF construction by-the-numbers - 9/23/2004 2:20:27 AM

Don Szczur

Posts: 944
Joined: 1/6/2002
From: Chantilly, VA, USA
Status: offline

Danny Koolman,

I really wanted to make Aruba but the hurricanes kept me away from my travel agent...

Here is what I did on my elevator. I cut a pieceof one inch wide by about xx(can't remember exactly) long balsa (I used 3/32 balsa). Do the following steps to get the length:

Get a long balsa stick and push it down the inside of the fuselage, from the front section, like where the canopy or belly pan accesses. Push the stick back until it contacts the mid- fuselage bulkhead, then mark it where it comes up to the last bulkhead in the cutout area. Pull out the stick, then measure how far back the bulkhead is *from the outside of the fuselage".

Now, measure the fuselage diameter at this point, subtract about 3/8 inch and you have the length of the one inch wide by xx inch long piece of balsa sheeting.

Next, punch a hole in it about 1/4 inch. Now assuming you mounted your elevator servo close to the centerline of the fuselage (yes the pushrod will move to each side about an eighth inch due to the servo arm rotational) but that is ok.

Put a couple of "dabs" of 5 minute epoxy on each end of the 1 inch wide by xx inch long piece, then slip it over the pushrod, hold the fuselage nose-vertical, and let the piece slowly slide down the pushrod til it makes contact with the mid-fuselage bulkhead.

Now, put the clevis back on the pushrod and connect back up to the servo. Use that long stick again to straighten out the 1 inch wide piece, making sure it contacts the bulkhead on both sides, and let the epoxy cure.

What I found on my FOCUS 1 was that the pushrod would oscillate, causing substantial trim change at high and low throttle settings. With the pushrod brace in place, the issue went away completely.

Not wanting to take any risks, I used the same pushrod re-inforcement on my Focus 1.5 and the Focus II.

Don

(in reply to Pro pattern)

Post #: 189

RE: FOCUS II ARF construction by-the-numbers - 9/23/2004 2:40:36 AM

Pro pattern

Posts: 354
Joined: 4/19/2003
From: Savaneta, ARUBA
Status: offline

Hello Don Szczur,

No problem, hope you still could come over here.

I have put a peace of foam instead of the Balsa.
Use nearly the exact same tech nick to accomplish it.

Here is the link to the post, there are some pic of the former that I have used and how it turn out.

http://www.rcuniverse.com/forum/m_2186527/anchors_2186527/mpage_1/key_/anchor/tm.htm#2186527

Thanks for the info, it’s appreciated.

Danny Koolman

_____________________________

Nobody is perfect, I’m nobody
3rd place, is just 2nd best loser

(in reply to Don Szczur)