Oly II S Build log? - Page 7

cn0rris · Nov 09, 2009, 12:02 AM

John,

Don't worry about the strength of your Oly. If you build it as planned, you'll be just fine. I really nosed mine into the ground hard - something was going to give. And the repair was simple and strong.

And Ray's right about weight. The Oly can take it just fine. Mine came out at 49 oz built completely stock, so his specs are right on.

Chuck

leaktech · Nov 09, 2009, 09:52 PM

Quote:

Originally Posted by Ray Hayes

Chuck and all ,
___________________________________________

Here are the set up specifications on my OLY ll S

Flying weight ... 49 oz
Wing Span ... 102.5 "
Wing Area ... 908 sq in
Wing Loading ... 7.77 oz per sq ft
Balance Point ... 6 - 3/16" Forward of T. E.
( Wing's trailing edge )
___________________________________________

The most important spec is the wing loading.

An OLY ll S flying at 7.77 oz per sq foot of wing area (wing loading ) will go up in gopher ....

But, will fly fast enough to have a good chance to fly out of sink.

Ray
Sky Bench ...Woodys Forever
http://www.skybench.com

I'm pretty happy with the way my E-Oly is thermaling. The wing loading is only .4oz over Rays pure glider Oly. I've got a pretty big outrunner in it and a 2100mah lipo under the wing. It will go strait up, even more so than my Radian and it thermals better too. If anyone is on the fence about building one don't hesitate it's a great and a good looking sailplane.

James

Ray Hayes · Nov 13, 2009, 05:34 AM

Don't lose your tail feathers

--------------------------------------------------------------------------------

I LOVE MY OLY11s and consider it my favorite sailplane. It makes flat tight turns so it is a great plane for flying with the hawks. My plane is electrified because of my micro flying field.

During a recent electric motor climb-out I let the plane fly too fast and I lost the complete tail in flight.

__________________________________________________ _________

Sure glad your OLY ll S had minimal damage, but I have to tell you, your conclusion about the tail feathers being torn off due to speed can't be true. Statements like yours can be detrimental to Sky Bench's reputation of providing quality and strong design woody kits.

And also confuse the many beginners using RC Groups as a source of information on building and flying woody r/c sailplanes.

This same stab/mount constuction is used in all my Bird Series, all the OLY ll series and so many other mfg's kits over the years.

I have, for years and years, dove vertically from speck out heights in front of hundreds of contest witness ( I'm not the only one do do this ) with my various Sky Bench designs and have not had the tail feathers fly off. I have flown F3B speed runs without the tail group flying off. For years and years, contest landings on the point tape have resembled a vertical crash and the tail groups don't break off.

The answer to what happened to your sailplane is the rear fuse area was damaged previously in hard landings or other mishaps. The type of landing where the sailplane rear fuse area is subjected to side forces caused by the plane rotating on landing and the rear of the fuse strickes a clump or ridge with the fuse side or one side of the stab. The latter being my vote on what happened to cause the fuse to break.

The extra long 1/8" plywood laser cut stab mount goes well forward in the fuse, way forward of the leading edge of the stab, does not break due to speed in any direction.

I have used 30 minute epoxy to glue the stab to the stab mount for years and years without ever losing a stab to glue failure.

It is a good practice to check your plane over, front to rear, hinges and controls before each flight.

Hope this helps.

Ray
Sky Bench ... Woodys Forever
http://www.skybench.com

TheNightowl · Nov 13, 2009, 05:50 AM

Quote:

Originally Posted by Ray Hayes

So if nose weight is required to balance at the proper point on any sailplane, a larger battery could be the best answer if the wing loading is satisfactory.

Hope this helps

Ray
Sky Bench ...Woodys Forever
http://www.skybench.com

I just want to second what Ray says here. If you have to add weight to a plane, make it useful weight over dead weight if any way possible.
Nightowl

Ray Hayes · Nov 13, 2009, 06:03 AM

I have narrowed the fuse on one of my 2M Lil'Birds, limiting battery width considerably. The battery I installed is an in-line 5 cell Nimh, located right up against the nose block.

Holds a charge forever.

Ray
Sky Bench ... Woodys Forever
http://www.skybench.com

cn0rris · Nov 13, 2009, 12:54 PM

Just a word of support and respect for Ray and SkyBench here. He's right about the robustness of the structure - the only failures I have ever experienced with my Oly II S have been because of hard landings. I have never had an in-flight failure, and I have many hours on it and have learned a tremendous amount. The SkyBench Oly II S is an extremely sturdy design that has served me well as I've learned a lot of new skills and made the usual piloting mistakes along the way.

I used my Oly while learning how to winch launch, and it's proven itself to handle hard launches with a stock (no added reinforcements) airframe. I've learned how to fly in TD contests, and how to do precision landings. Sometimes, I've landed pretty hard while learning the art of the TD contest, trying to get the best possible landing points. In all cases, the Oly has surprised me by how strong it is. I've done things that should by all rights have broken something, and it's survived with only cosmetic scratches.

The damage I described that started this recent discussion was a result of an extremely hard nose-in landing when I botched a downwind landing in a contest, came in hot, and had to put it down hard to keep it from leaving the landing safety zone and plowing into a crowd of people. It's the fact that I only broke my empennage that is remarkable, and it's a testament to how strong the Oly II S structure is.

Anyone looking for a thermal plane that flies great and can take a lot of abuse would have a hard time finding something better.

Chuck

craigrrr · Nov 13, 2009, 01:09 PM

Quote:

Originally Posted by Ray Hayes

Don't lose your tail feathers

--------------------------------------------------------------------------------

I LOVE MY OLY11s and consider it my favorite sailplane. It makes flat tight turns so it is a great plane for flying with the hawks. My plane is electrified because of my micro flying field.

During a recent electric motor climb-out I let the plane fly too fast and I lost the complete tail in flight.

__________________________________________________ _________

Sure glad your OLY ll S had minimal damage, but I have to tell you, your conclusion about the tail feathers being torn off due to speed can't be true. Statements like yours can be detrimental to Sky Bench's reputation of providing quality and strong design woody kits.

And also confuse the many beginners using RC Groups as a source of information on building and flying woody r/c sailplanes.

This same stab/mount constuction is used in all my Bird Series, all the OLY ll series and so many other mfg's kits over the years.

I have, for years and years, dove vertically from speck out heights in front of hundreds of contest witness ( I'm not the only one do do this ) with my various Sky Bench designs and have not had the tail feathers fly off. I have flown F3B speed runs without the tail group flying off. For years and years, contest landings on the point tape have resembled a vertical crash and the tail groups don't break off.

The answer to what happened to your sailplane is the rear fuse area was damaged previously in hard landings or other mishaps. The type of landing where the sailplane rear fuse area is subjected to side forces caused by the plane rotating on landing and the rear of the fuse strickes a clump or ridge with the fuse side or one side of the stab. The latter being my vote on what happened to cause the fuse to break.

The extra long 1/8" plywood laser cut stab mount goes well forward in the fuse, way forward of the leading edge of the stab, does not break due to speed in any direction.

I have used 30 minute epoxy to glue the stab to the stab mount for years and years without ever losing a stab to glue failure.

It is a good practice to check your plane over, front to rear, hinges and controls before each flight.

Hope this helps.

Ray
Sky Bench ... Woodys Forever
http://www.skybench.com

Ray:

I BELIEVE THAT YOU ARE CORRECT AND THAT I MADE A BAD ASSUMPTION ABOUT CAUSE OF FAILURE. If so I am sorry for any damage that my conclusion may have caused to Sky Bench's reputation.

It is probable that tail was damaged in transport or previous landing. I did not check the condition of the tail prior to this flight. I think I will be more disciplined and do a more thorough checkout before flight in the future.

Of all of my electric sailplanes the OLYIIs is the easiest to control under electric climb-out. It is probable that during climb-out I lost control do to tail seperation (due to previous unnoticed damage).

Craig

likeswindinhai · Nov 15, 2009, 12:07 AM

Hope to get my oly 11 done here soon, right now. Im working out the spoilers. I fiberglassed the fuse and the wings. Here is a couple of pictures. This thread helped me thru my build. But came into it a bit late in the build.

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Nov 09, 2009, 12:02 AM	#91
cn0rris Registered User Join Date: Aug 2008 Location: San Diego Posts: 321	John, Don't worry about the strength of your Oly. If you build it as planned, you'll be just fine. I really nosed mine into the ground hard - something was going to give. And the repair was simple and strong. And Ray's right about weight. The Oly can take it just fine. Mine came out at 49 oz built completely stock, so his specs are right on. Chuck

Nov 13, 2009, 05:34 AM	#93
Ray Hayes Registered User Join Date: Apr 2003 Posts: 776	Don't lose your tail feathers -------------------------------------------------------------------------------- I LOVE MY OLY11s and consider it my favorite sailplane. It makes flat tight turns so it is a great plane for flying with the hawks. My plane is electrified because of my micro flying field. During a recent electric motor climb-out I let the plane fly too fast and I lost the complete tail in flight. __________________________________________________ _________ Sure glad your OLY ll S had minimal damage, but I have to tell you, your conclusion about the tail feathers being torn off due to speed can't be true. Statements like yours can be detrimental to Sky Bench's reputation of providing quality and strong design woody kits. And also confuse the many beginners using RC Groups as a source of information on building and flying woody r/c sailplanes. This same stab/mount constuction is used in all my Bird Series, all the OLY ll series and so many other mfg's kits over the years. I have, for years and years, dove vertically from speck out heights in front of hundreds of contest witness ( I'm not the only one do do this ) with my various Sky Bench designs and have not had the tail feathers fly off. I have flown F3B speed runs without the tail group flying off. For years and years, contest landings on the point tape have resembled a vertical crash and the tail groups don't break off. The answer to what happened to your sailplane is the rear fuse area was damaged previously in hard landings or other mishaps. The type of landing where the sailplane rear fuse area is subjected to side forces caused by the plane rotating on landing and the rear of the fuse strickes a clump or ridge with the fuse side or one side of the stab. The latter being my vote on what happened to cause the fuse to break. The extra long 1/8" plywood laser cut stab mount goes well forward in the fuse, way forward of the leading edge of the stab, does not break due to speed in any direction. I have used 30 minute epoxy to glue the stab to the stab mount for years and years without ever losing a stab to glue failure. It is a good practice to check your plane over, front to rear, hinges and controls before each flight. Hope this helps. Ray Sky Bench ... Woodys Forever http://www.skybench.com

Nov 13, 2009, 06:03 AM	#95
Ray Hayes Registered User Join Date: Apr 2003 Posts: 776	I have narrowed the fuse on one of my 2M Lil'Birds, limiting battery width considerably. The battery I installed is an in-line 5 cell Nimh, located right up against the nose block. Holds a charge forever. Ray Sky Bench ... Woodys Forever http://www.skybench.com

Nov 13, 2009, 12:54 PM	#96
cn0rris Registered User Join Date: Aug 2008 Location: San Diego Posts: 321	Just a word of support and respect for Ray and SkyBench here. He's right about the robustness of the structure - the only failures I have ever experienced with my Oly II S have been because of hard landings. I have never had an in-flight failure, and I have many hours on it and have learned a tremendous amount. The SkyBench Oly II S is an extremely sturdy design that has served me well as I've learned a lot of new skills and made the usual piloting mistakes along the way. I used my Oly while learning how to winch launch, and it's proven itself to handle hard launches with a stock (no added reinforcements) airframe. I've learned how to fly in TD contests, and how to do precision landings. Sometimes, I've landed pretty hard while learning the art of the TD contest, trying to get the best possible landing points. In all cases, the Oly has surprised me by how strong it is. I've done things that should by all rights have broken something, and it's survived with only cosmetic scratches. The damage I described that started this recent discussion was a result of an extremely hard nose-in landing when I botched a downwind landing in a contest, came in hot, and had to put it down hard to keep it from leaving the landing safety zone and plowing into a crowd of people. It's the fact that I only broke my empennage that is remarkable, and it's a testament to how strong the Oly II S structure is. Anyone looking for a thermal plane that flies great and can take a lot of abuse would have a hard time finding something better. Chuck

Nov 15, 2009, 12:07 AM	#98
likeswindinhai likeswindinhair Join Date: Oct 2008 Location: 309 13th street buhl idaho 83316 Posts: 15	Hope to get my oly 11 done here soon, right now. Im working out the spoilers. I fiberglassed the fuse and the wings. Here is a couple of pictures. This thread helped me thru my build. But came into it a bit late in the build.