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Old Aug 19, 2010, 11:30 AM
USA'd ex Brit
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RO8.. but not quite.

This is the third in a series of 're-builds' of gliders that I built / owned back in the late 1970's and 80's when I lived in Great Britain

I came across the plan / build article for RO8 in a October 1979 edition of 'Radio Control Magazine' and i liked the general shape, but thought i could simplify and improve its 'look'.
After many hours pouring over the drawing board, I came up with a plan that i thought would work. I'd altered the nose area to a more streamlined look and re-engineered the (over complicated) tailplane and how it attached to the fin.

My previous RO8 (Re named by other club members as 'Monroe' as it looked sexy without even moving!) was covered in tissue and with standard radio gear (1980's!) installed tipped the scale at 21oz... and flew incredibly well. catching thermals from hand launches and remaining aloft (on the slope) on just the merest breath of wind.

Unfortunately, when i moved to the US, all of my models had to be sold due to a lack of 'transport' space.. but Monroe had suffered a bad case of 'hangar rash' and I destroyed what was left of the wings and fuselage.. I did however save the tailplane / fin fixing (I hope to re use these in the MKII) and the wing rib templates...

To be continued...
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Old Aug 19, 2010, 05:18 PM
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Czech Republic
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Coool!!!
R08 is kinda oldschool, but my favorite design. I hope that I will build one somedays.
Was your wing two-piece, or one-piece as per plans?
Looking forward for next posts
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Old Aug 19, 2010, 07:38 PM
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Coool!!!
R08 is kinda oldschool, but my favorite design. I hope that I will build one somedays.
Was your wing two-piece, or one-piece as per plans?
Old school yes... but a very interesting design.. and a huge lesson in how to save weight..
The wing was one piece and covered in tissue.. a couple of good reasons why it suffered so much from 'hangar rash'..
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Old Aug 19, 2010, 07:46 PM
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As i mentioned in my first post, the original Monroe (RO8) weighed in at 21oz with standard size radio gear...
Now there is micro gear, smaller Rx's and servo's as well as smaller battery technology.. together with some more holes in the structure, I'm hoping to get the new version under 20oz.

I've cut 22 wing ribs (I always cut more than i need) and with the spar slots, but minus the turbulator slots and the holes in the ribs, the stack of ribs weigh in at 1.130oz... I make that 0.0513oz per rib.. on average.
After I've added the holes, I'll weigh them again and see how much weight has been saved.
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Old Aug 20, 2010, 01:50 AM
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Old school yes... but a very interesting design.. and a huge lesson in how to save weight..
Thats exactly the reason why this plane attracts me so much
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Old Aug 20, 2010, 11:20 AM
<>< AKA W4BPS
USA, TN, Tullahoma
Joined Dec 2001
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Ro 8

I had several of these back in the day. What a fun flyer.. Loved them. Wonder how one would fly with a Dreala airfoil? Hmmmm
Don't for get to use some carbon fiber where the step is under the wing as the fuse transitions into the small size for the rear boom. Brian
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Old Aug 20, 2010, 11:49 AM
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Don't for get to use some carbon fiber where the step is under the wing as the fuse transitions into the small size for the rear boom.
The 'original' version of the RO8 had the step in the bottom of the fuselage under the back of the wing... but my re-designed version did away with that and faired in the 'pod' with the 'boom'.
I never had any problems with the fuselage on my 1980's version once it was built and covered.
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Old Aug 20, 2010, 12:49 PM
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I like that design, never heard of it before.

How do you cut the holes in the ribs?

Cheers

Gary
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Old Aug 20, 2010, 01:04 PM
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How do you cut the holes in the ribs?
I drill a hole through the rib first and then open out the hole to the right dia. with a tapered grinding stone... working the stone in from either side of the rib gives a good 'edge' to the hole..
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Old Aug 20, 2010, 01:22 PM
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On each individual rib, not sandwich style?

I see more lightening holes in the fuselage!!

I've been looking for something to cut holes nicely in balsa, not really found anything yet.

Cheers

Gary
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Old Aug 20, 2010, 01:54 PM
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On each individual rib, not sandwich style?

I see more lightening holes in the fuselage!!

I've been looking for something to cut holes nicely in balsa, not really found anything yet.
Yes, on each individual rib... and yes.. It takes a while..

There are lightening holes along each side of the fuselage, both in the boom and under the wing... It's only 1/32" ply on the sides of the fus, so it gets a bit fragile until its all assembled..

For balsa and ply, the tapered grinding stone is the best I've found so far for getting a nice neat hole... I've tried sharpened tube to stamp out the holes, but that just crushes the wood.
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Old Aug 20, 2010, 03:07 PM
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Coo! That's a lot of holes to enlarge!!!

Good idea though, how big does the first drill hole have to be?

Perhaps you could post a few piccies of the process?

Of course the easiest way to cut holes is with a laser but there's no fun in that!!

Cheers

Gary
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Old Aug 21, 2010, 12:07 AM
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Coo! That's a lot of holes to enlarge!!!

Good idea though, how big does the first drill hole have to be?

Perhaps you could post a few piccies of the process?
There is not really that much to it...

Drill holes in the rib (1/8" for the small holes, 3/16" for the bigger holes) positions marked from the ply template..
Use the small grinding stone to open up the small holes to the right diameter..
Use a needle file (or the small grinding stone) to open up the other holes until i can get the bigger grinding stone in to the hole and open up the hole to the right diameter.
I go in to the rib from both sides (by hand!) to get an even hole..
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Old Aug 21, 2010, 04:34 AM
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Toesup
Thanks for that, good technique.

Gordon
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Old Aug 21, 2010, 02:55 PM
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Yes, thanks!

As Bruce Forsyth used to say '...and that's all there is to it!'

He's still goin ya know!!

Cheers

Gary
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