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RE: OMP 50in 10-300 Ultimate - Marty's Build - 2/10/2005 1:58:06 PM   
SMALLFLY-



Posts: 2150
Joined: 12/9/2001
From: Evansville, IN, USA
Status: offline 		I sure can see where you would be uncomfortable with that wing joining. Something doesnt look right there with all that bow in those rails. Might it be better to cut the rib's a little deeper and add a little stock on the bottom of the rails sanded to a long taper?
Any comments from MIKE?

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RE: OMP 50in 10-300 Ultimate - Marty's Build - 2/11/2005 12:38:28 AM   
martyg



Posts: 519
Joined: 6/23/2002
From: Garland, TX, USA
Status: offline
quote:

ORIGINAL: Spacey
Marty do you think the incidence meters are really needed to get it right? I don't have one?


Not a mandatory item, you surely can complete this kit without one.
But it's always nice to measure and make sure. Sometimes you find surprises!
If you are serious about building, I would definitely have one of these on my wish list.
The Great Planes laser meter is remarkably precise and reasonably priced.

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-- Marty

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RE: OMP 50in 10-300 Ultimate - Marty's Build - 2/11/2005 12:55:29 AM   
martyg



Posts: 519
Joined: 6/23/2002
From: Garland, TX, USA
Status: offline 		The finished product, after sanding the edges clean and fitting a new dowel and bolt.
I figure I added maybe 1/4oz to the model with this operation.

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-- Marty

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RE: OMP 50in 10-300 Ultimate - Marty's Build - 2/11/2005 12:56:48 AM   
martyg



Posts: 519
Joined: 6/23/2002
From: Garland, TX, USA
Status: offline 		Tail section is hinged.

I’m using small (3/32in) pin hinges here. 5 on the rudder, 4 per elevator side.
Regular 1/8in pin hinges would be too big here, and weaken the structure.

The plan calls for CA hinges, which would work fine too. I just like these better.

Note added scabs, to fully enclose the entire length of the hinges.
This ensures epoxy doesn’t drip into the open structure during final assembly.
Also provides better bite for the hinge barbs.

Weather was good today, so I packed it in and went flying for the afternoon.
(I’m still dialing in my previous project, a Lanier Ultimate Pitts)

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< Message edited by martyg -- 2/11/2005 12:58:53 AM >

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-- Marty

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RE: OMP 50in 10-300 Ultimate - Marty's Build - 2/11/2005 1:13:47 AM   
STLPilot


 

Posts: 9203
Joined: 3/12/2003
From: Manhattan, NY, USA
Status: offline 		Marty could you be so kind to post a couple in the bones shots before covering, fully assembled.

I'll stick on the front page of OMP website and caption it "nude model of the month".

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RE: OMP 50in 10-300 Ultimate - Marty's Build - 2/11/2005 6:49:34 AM   
Spacey



Posts: 1876
Joined: 1/27/2004
From: Pretoria, SOUTH AFRICA
Status: offline 		Marty I guess you are right regarding the incidence meter. I guess its time to visit Tower sometime soon. Here by me the stuff is simply too expensive. Last time I was at the LHS they were asking $116 for the great planes one. I'm sure I'll get it at tower landed for much cheaper.

(in reply to STLPilot)
       Post #: 56

RE: OMP 50in 10-300 Ultimate - Marty's Build - 2/11/2005 12:57:31 PM   
AFSalmon



Posts: 3742
Joined: 5/24/2002
From: Beavercreek, OH,
Status: offline 		The amount of bow required in the joiner spars is really minimal. I had no problem pressing them into place and sheeting across the midsection on all the prototypes but maybe I'm too close to it (you think!). This procedure is also done on the Matlok OMP Katana kit for the midsection. I'll stay tuned for more customer feedback and certainly make improvements if needed. The way the laser cutting is done the wings should fall right into place very accurately. But Marty iws absolutely right in that all serious builders should have an incidence meter. Heck the same goes for ARF builders as well. I know the few arfs I've gotten in past years needed adjustments in incidence. A certain 80" Cap ARF I got years ago was so off I could never get the plane flying right until I checked the incidence of everything. The engine, stab, and both wings were significantly off. The stab needed almost 1/4" shim in the front to get it right.

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Mike (Salmon) Pilkenton, Chief Slab Designer
Ohio Model Planes, Team OMP Captain

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       Post #: 57

RE: OMP 50in 10-300 Ultimate - Marty's Build - 2/12/2005 8:46:28 PM   
mrbigg



Posts: 2839
Joined: 10/30/2004
From: Streator, IL, USA
Status: offline 		hey marty, i know your busy, but could you elaborate on the incidence meter? what is the proper procedure? do you level the stab and take readings off of that for the wings and thrust line? thanks.

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PROVERBS 15:22 - Plans go wrong for lack of advice; many counselors bring success.

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       Post #: 58

RE: OMP 50in 10-300 Ultimate - Marty's Build - 2/12/2005 11:08:18 PM   
martyg



Posts: 519
Joined: 6/23/2002
From: Garland, TX, USA
Status: offline 		It's super easy on this airplane, as the thrust line and wing/stab incidences are all 0-degrees.
In post 35 above, I transferred the motor thrust line from the plans to the fuselage.

The procedure is to jig the airplane to the workbench, so it doesn't move around.
Tilt the fuselage fore/aft until this line is level. Use a regular spirit level to measure.

Then use the incidence meter on the wings, and make sure both of them read zero.
Try different places along the spans to check for wash-in/out. (You want zero everywhere)
If you see a degree or more off from this, something will need to be adjusted.
If you can keep all measurements within +/- 1/4 to 1/2 degree, you are ready to rock 'n roll.

Same procedure for the horizontal stab.
Some meters come with prop shaft adapters, so you can measure the motor alignment too.

Don't get too obsessive with this tool!
A good eyeballing will get you close, an should be done anyway as a reality check.
But like I said earlier, its good to be able to measure accurately to make sure.

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RE: OMP 50in 10-300 Ultimate - Marty's Build - 2/13/2005 2:24:49 AM   
mrbigg



Posts: 2839
Joined: 10/30/2004
From: Streator, IL, USA
Status: offline 		thanks man. i think i'm going to make an investment for sure. any brand recomendations?

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PROVERBS 15:22 - Plans go wrong for lack of advice; many counselors bring success.

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       Post #: 60

RE: OMP 50in 10-300 Ultimate - Marty's Build - 2/14/2005 1:50:12 AM   
martyg



Posts: 519
Joined: 6/23/2002
From: Garland, TX, USA
Status: offline 		Most of the day today was spent installing linkages, and getting everything fitting perfect.
This is all straightforward, and went pretty quick, so not too many pictures.

A couple quick notes on the ailerons.

I was uncomfortable with the torsional rigidity of the stock ailerons.
Especially since the servo linkages are all the way inboard.
So I added some diagonal bracing to stiffen things up a bit.

When I built the upper ailerons, I noticed my parts didn’t fit the plans well.
Today was the time I needed to adjust what I ended up with, and make it fit right.

I had no issues with the bottom ailerons. The parts built up into a perfect fit.

OMP is aware I had this issue.
Maybe it was just me or my kit, but keep an eye on this if you’re building one of these.

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-- Marty

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RE: OMP 50in 10-300 Ultimate - Marty's Build - 2/14/2005 1:51:42 AM   
martyg



Posts: 519
Joined: 6/23/2002
From: Garland, TX, USA
Status: offline 		Man and tail gear are installed.

I never have bolts long enough to attach the main gear, so I just use pieces of #6 all-thread with bolts on both ends. Standard bolts will be substituted with nylocks on final assembly.

Leaf spring type tail gear from CB Tatone has worked well for my last few models.
All the other cheaper (plastic) one I tried never lasted very well for me.

Radio hatch is built up 1/8in to allow clearance for receiver/battery and padding.
Beveling tool is used again here to clean up the appearance a little.

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-- Marty

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RE: OMP 50in 10-300 Ultimate - Marty's Build - 2/14/2005 1:52:54 AM   
martyg



Posts: 519
Joined: 6/23/2002
From: Garland, TX, USA
Status: offline 		Fin and filler blocks installed per the instructions.
The plans don’t call for this, but a little extra triangle stock makes me sleep better.

Once that assembly has set up, rudder hinge line is set up and beveled.

I should have this thing complete “in the bones” tomorrow morning.
I’ll post pictures and the weight as soon as I’m done.

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-- Marty

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       Post #: 63

RE: OMP 50in 10-300 Ultimate - Marty's Build - 2/15/2005 1:19:33 AM   
martyg



Posts: 519
Joined: 6/23/2002
From: Garland, TX, USA
Status: offline 		In the bones, fully functional except for covering.
It's nose heavy right now, even with the motor pushed all the way back.

Weight as shown is 5lb10oz. (No this is not a typo)
Looks like I am easily going to come 3/4lb under the advertised weight, ready to fly.

This thing is going to be a missile with the Saito 100.

Dion, PM me with with a location to upload hi-rez pics.

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