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OS FS26??? - 9/6/2012 5:30 PM

klord125

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I have a NIB FS26 OS. I was wondering are these things dogs? I see they don't make them any more?? Also what size and style plane will work with it. Any info would be great. Thanks Ken

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RE: OS FS26??? - 9/6/2012 5:51 PM

soarrich

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I have one in a 50" Cub. Dog, no, but it has the power of about a 15 two-stroke, you just don't see a lot written about this size plane. This size plane apples to guys on budgets and it's not a budget engine.

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RE: OS FS26??? - 9/6/2012 7:11 PM

klord125

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I would like to put it into Bipe. I don't know whats out there for plans or a kit .15 size?

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RE: OS FS26??? - 9/6/2012 8:25 PM

BMatthews

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I'm not sure that they even make the same power as a .15 sport two stroke. But it's close. What they DO have in spades is a lovely sound, easy starting and charisma oozing out of every opening.... or is that just the crankcase vent spewing oil....

A 34 to 36 inch lightly built biplane along the lines of an antique or old timer/big rubber model would be an excellent choice for this engine. A hot little Pitts style sporty aerobatic model not so much. It's just not that sort of engine.

A WW1 scale model built up with all open frame construction to around 36 to 38 inch wing span would be a SUPERB combination. Or any number of between the war light scale designs like a Gypsy Moth or Tiger Moth.

If you could find and lighten up the old Flyline kit of the Great Lakes biplane that would be another nice option. Most of the kit is fine but it's got some BIG AND HEAVY hunks of plywood that it uses for the main structure that could be replaced with some lighter options. ALong with a few other changes and this could be a superb option for this engine.

Like you I've got one of these fine little character engines. I just haven't put it into a good home yet.

One option that I've thought about is to take the Sig free flight Cabinaire and turn it into a biplane. Or alternatively take the biplane Customaire and put the "inline engine" nose from the Cabinaire onto that design. But really either path would lead to the same results. I'd then blow it up to double or just a little smaller, flatten out most of the diheral for ailerons and build it up using a few extra and heavier sticks to come up with a proper looking old timey style of model which is nice and light and would fly with the modest power of the little FS26.

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RE: OS FS26??? - 9/6/2012 10:14 PM

airraptor

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I would say they have the same power as a 15 in med sized planes like 250SQ and bigger. The 26 is around 9.2 ounces with no muffler. Most 15's are around 5-6 ounces.

15's work best on a 7x5 APC for speed planes and a 8x4-8x5 for larger planes
26's work best on a 8x8-8x10 for speed planes and a 9x7-10x6 for most sport planes

My OS 30FS will spin a 9x6 APC at around 16,000

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RE: OS FS26??? - 9/7/2012 1:09 AM

noveldoc

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I have two. While it was still available, I fitted one with a reverse cam so it will run backward. Gotta do a twin someday.

They are great engines IMHO. Easy to start and run. Very smooth with decent torque.

I mainly ran mine, taking turns, on an old Balsa USA Stik 20. Did great. I also flew 1 on a Kadet Seniorita. Took more of a takeoff run (Note more realistic) but flew just fine in the slow stately way a Kadet does best.

I'd recommend a trainer for .15 to .20 2 strokes that will fly on the wing.

I have another Seniorita. Lost battery power and crashed the old one. Plan is to convert to nacelles and fly with twin 26's. Bet it will sound great.

Tom

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RE: OS FS26??? - 9/7/2012 4:07 PM

klord125

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I would love to build a Tiger Moth or SE5A to put this in. I just scratched a 52"ws SE5A. It was an English plan and designed real beefy/heavy. I made alot of changes to lighten it up but not hurt the integrity. I'm not sure these set of plans would be the ones to shrink. What do you think of a Sopwith pup or Camel?? I have a set of plans for a Sopwith Pup I think 52-55"ws that I can shrink down. Its all built up but I could probably build it pretty light. Any suggestions? Thanks Ken

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RE: OS FS26??? - 9/7/2012 4:46 PM

airraptor

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go for it. try to keep it 4lbs or less. 3lbs would be better.
Remember keep it light and keep it scale speed and you can use "small" servos and flight gear to save even more. then fly if scale like and have a great plane.

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RE: OS FS26??? - 9/9/2012 12:13 AM

Thomas B

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quote:

ORIGINAL: soarrich

I have one in a 50'' Cub. Dog, no, but it has the power of about a 15 two-stroke, you just don't see a lot written about this size plane. This size plane apples to guys on budgets and it's not a budget engine.

A silly generalization. I like smaller models and am not on a budget, model wise. Model size is a matter of preference, IMO.

Had one of these back in the 1980s. Great little motor. Not a super powerhouse, but would fly any .19 size model nicely.

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RE: OS FS26??? - 9/9/2012 11:08 AM

Patxipt

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I had mine on a Junior 60 and on a .25 trainer. Good match to both airframes, although overpowering the J60

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RE: OS FS26??? - 9/9/2012 1:08 PM

Warren B

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quote:

ORIGINAL: klord125

I would love to build a Tiger Moth or SE5A to put this in. I just scratched a 52"ws SE5A. It was an English plan and designed real beefy/heavy. I made alot of changes to lighten it up but not hurt the integrity. I'm not sure these set of plans would be the ones to shrink. What do you think of a Sopwith pup or Camel?? I have a set of plans for a Sopwith Pup I think 52-55"ws that I can shrink down. Its all built up but I could probably build it pretty light. Any suggestions? Thanks Ken

The late David Boddington designed a very nice pair of biplanes for the FS 26. a Tiger Moth and a Gypsy Moth.
Both are simple buids for 3 channel, no need for ailerons on these old bipes, they look silly doing aileron rolls anyway, much better a barrelly rudder roll.

I have digital version of the Gypsy Moth, pm me if you want a copy emailed.

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RE: OS FS26??? - 9/9/2012 4:36 PM

ARUP

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Yes, those O.S. 26's are awful so mail it to me right away! I'll even pay postage to save you the grief! *wink*
Seriously, they're great little engines. I flew a Curtiss 'Headless Pusher' of own design with one. It had a 48" span. Just think of it... 48" span AND two wings with all those struts and rigging 'wires' (fishing string). That '26 putt-putted' that Curtiss without any problems at all. It's only when I added floats that I realized I was asking too much... it never would unstick but it sure would motor around the lake in tidy fashion!!!! The pilot was articulated to move with the controls, too!

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RE: OS FS26??? - 9/22/2012 3:16 AM

hogflyer

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I've got one of these little jewel's too. I've been thinking something like a Midwest Tri-Squire would be a great home for it. It's basically in the same ballpark as something like a Veco .19 power wise, so any trainer in the .19-.21 range, or .15-.19 sport plane should be a good candidate for it.

I've seen the Sig 1/6 scale Cub fly on a Veco .19, so if built light it may work also, but will fly in a very scale like manner. Something like a Craft-Air Butterfly may also be a good candidate.

Arup - That's one sweet looking Curtiss Pusher.

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RE: OS FS26??? - 9/22/2012 12:19 PM

Trisquire

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quote:

ORIGINAL: ARUP

..............It's only when I added floats that I realized I was asking too much... it never would unstick but it sure would motor around the lake in tidy fashion!!!!

Did you use a scale float? The full-scale float didn't have step. That would keep it from unsticking.

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RE: OS FS26??? - 9/22/2012 2:41 PM

somiss1

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The TriSquire/OS .26 would be a super sweet combo! The .26 is a great engine-easy to run and sounds wonderful. You have a gem!

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RE: OS FS26??? - 9/23/2012 3:20 AM

woodycubamo

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I have a OS26FS and plan on building the Tower Hobbies Taylorcraft and using the 26FS to power it. It is a .20 size plane. It won't be overpowered but should be OK. I built a Seniorita and flew it with the OS26 for many years. The Taylorcraft is slightly smaller and lighter so the OS26FS should be adequate.

Woody

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