Author Topic: os 20 (Read 4929 times)

John Desrosiers · « **on:** March 15, 2014, 03:00:34 PM »

What is a good plane for my os 20?

Tim Wescott · « **Reply #1 on:** March 15, 2014, 04:29:38 PM »

FP 20? Or a 20S (did they make those?).

An FP 20 is great on a Sig Skyray if it's not too heavy.

I have my FP 20 on a Ringmaster at the moment, The plane is too heavy, but flies well enough on 60 foot lines to net me 475 points in Classic at the Fall Follies last year.

Or if you're demented enough, you can build a Waiex. Mine flew way better on an FP 20 than I could do justice to -- but that's not saying much, because it's what I flew when I was starting in Beginner.

Joe Just · « **Reply #2 on:** March 15, 2014, 04:40:51 PM »

Flight Streak! Skyray (with substitute balsa ribs etc.
Joe

Larry Fernandez · « **Reply #3 on:** March 15, 2014, 07:58:01 PM »

Depending on your building and flying skills, Sig Skyray hands down.
or if you up to the challenge, the Still Stuka ROCKS with an FP .20.

Larry, Buttafucco Stunt Team

John Desrosiers · « **Reply #4 on:** March 16, 2014, 01:12:20 PM »

OK, thank you guys for the info. I have a skyray kit out in my shed. Joe this os 20 I have was given to me from JIM. I dont want to mess this one up.

Brett Buck · « **Reply #5 on:** March 16, 2014, 01:16:08 PM »

Quote from: John Desrosiers on March 16, 2014, 01:12:20 PM

OK, thank you guys for the info. I have a skyray kit out in my shed. Joe this os 20 I have was given to me from JIM. I dont want to mess this one up.

This is an FP, correct? Not a baffle-piston engine?

Brett

Tim Wescott · « **Reply #6 on:** March 16, 2014, 01:28:10 PM »

Quote from: Brett Buck on March 16, 2014, 01:16:08 PM

This is an FP, correct? Not a baffle-piston engine?

This question can't be reiterated too much -- my Ringmaster will barely stunt on 55 foot lines with a 25S (baffle-piston), but flies with authority on 60' lines with an FP 20. "OS 20" is absolutely positively not enough information to go by.

If you don't know how to identify it, post pictures of both sides, or ask what to look for.

John Desrosiers · « **Reply #7 on:** March 16, 2014, 02:30:10 PM »

My engine is an (max os 20)

Dan McEntee · « **Reply #8 on:** March 16, 2014, 02:46:33 PM »

Quote from: John Desrosiers on March 16, 2014, 02:30:10 PM

My engine is an (max os 20)

But it should say "FP" on the case somewhere. Sounds like you have the earlier baffle piston version. Run the piston down to bottom dead center and shine a flash lite in to see if you see a baffle on top of the piston, on the other side from the exhaust opening. If so, that is what you have. You will need a smaller plane for this engine, and I would suggest the SIG Acromaster profile, or something similar in size. You will want to make sure you have some castor in the fuel and at minimum of 20 to 25% total oil also. It will run fine, just not a real power house. I tried one on a Flite Streak ARF and it was barely capable of level flight, so you will need to think smaller models. As I mentioned, the SIG Acromaster, JR Flite Streak, Ringmaster JR, airplanes in that size range.
Good luck and have fun,
Dan McEntee

John Desrosiers · « **Reply #9 on:** March 16, 2014, 03:06:28 PM »

Yes it does have a baffle on the piston mmmmmmm What now.

Tim Wescott · « **Reply #10 on:** March 16, 2014, 03:34:41 PM »

Now you find any design from 1950 to 1975 that is billed as being for "15 to 19", build it, and have fun (on shortish lines).

Dan McEntee · « **Reply #11 on:** March 16, 2014, 04:28:54 PM »

Quote from: John Desrosiers on March 16, 2014, 03:06:28 PM

Yes it does have a baffle on the piston mmmmmmm What now.

Re-read my last post for the designs mentioned there. All still available and all good airplanes, and good matches for this engine. Read up on the specs of each to get an idea of their size, and I think you can find them all on the Brodak web site along with some versions of the Clown design that are this size. Lots of options for you, including the Junior Nobler, which just popped into my head. Spend some time surfing the different manufacturer's web sites and you'll find something. Tons of plans out there also including the .15 size models from the old Midwest series like the .15 Magician.
Good luck and have fun,
Dan McEntee

Bill Little · « **Reply #12 on:** March 16, 2014, 05:00:54 PM »

Hi John,

I agree with Dan (as I usually do! LOL!!), find a .15-.19 size design and you should be good to go! One kit Dan didn't mention is the new "CUB" from Brodak. It is a scaled down Gieseke Bear.

BIG Bear
RNMM/AMM

Brett Buck · « **Reply #13 on:** March 16, 2014, 05:07:55 PM »

Quote from: John Desrosiers on March 16, 2014, 03:06:28 PM

Yes it does have a baffle on the piston mmmmmmm What now.

Think Shark 15, Jr. Nobler, etc. It's a decent little engine and it was the first-ever "big" engine I bought new, but it's not a Fox 35 replacement like the 20FP.

Brett

John Desrosiers · « **Reply #14 on:** March 16, 2014, 05:47:07 PM »

I also have a sig akromaster kit under my bed. Would that one be ok?

John Desrosiers · « **Reply #15 on:** March 16, 2014, 05:51:49 PM »

I hide this stuff from my wife. hehehehe.

Bill Little · « **Reply #16 on:** March 16, 2014, 05:52:50 PM »

Quote from: John Desrosiers on March 16, 2014, 05:47:07 PM

I also have a sig akromaster kit under my bed. Would that one be ok?

Hi John,

That should be a good one for it. I would look up the mods many do to the Akromaster like making the wing longer by not trimming the LE, etc..

BIG Bear
RNMM/AMM

Akihiro Danjo · « **Reply #17 on:** March 16, 2014, 10:00:41 PM »

How about Brodak's Super Clown and Original Tomahawk ?
(sorry, I have never seen the kit $:-\$ )

Aki

Motorman · « **Reply #18 on:** March 16, 2014, 10:09:48 PM »

You want about a 300 sq. in wing that's about 1-1/8" thick.

MM

James C. Johnson · « **Reply #19 on:** March 18, 2014, 06:25:22 AM »

Veco Tom Tom. Brave, Tomahawk... I flew the 41" Tomahawk with a Veco 19 when I was a kid... that plane was a favorite. Use 52-56 ft lines.. I have the older Tom Tom just about ready to fly and thought of using a McCoy 19 because it looked "period correct".. but I have Veco 19s too... the Veco 19 is more powerful than the baffle OS 25... I have three for sale on ebay right now with Mufflers all are RC but venturis are sold by K&B..

A more modern plane is Pat Johnston's Stunt Trainer.. I flew this plane to learn the pattern with a stock FP25... I learned the pattern but never really liked the engine runs I got...

Jim

John Park · « **Reply #20 on:** March 18, 2014, 07:22:07 AM »

GMA's profile Peacemaker (36 1/2" wingspan) that he designed for 'Aeromodeller' magazine. Build it light, 18 oz. or less, and fly on 52' - 55' lines. Nothing finer for an old OS .20.

Regards
John

john e. holliday · « **Reply #21 on:** March 18, 2014, 08:50:49 AM »

I have a Rivers diesel on my Peacemaker.

Randy Ryan · « **Reply #22 on:** March 18, 2014, 09:31:44 AM »

Quote from: Bill Little on March 16, 2014, 05:52:50 PM

Hi John,

That should be a good one for it. I would look up the mods many do to the Akromaster like making the wing longer by not trimming the LE, etc..

BIG Bear
RNMM/AMM

Akromaster is a very nice flying airplane and should be a good match for your .20. I fly one in a PAW .09 diesel and it will do the entire pattern fairly respectably. It should do the same with the OS .20.

John Desrosiers · « **Reply #23 on:** March 18, 2014, 11:30:27 AM »

I have an old Buntting brothers V1 Thats built but I never drilled out mounting holes. Any good?

RandySmith · « **Reply #24 on:** March 18, 2014, 12:45:48 PM »

A Shark 15 would be a great choice

Randy

Dan McEntee · « **Reply #25 on:** March 18, 2014, 03:26:54 PM »

Quote from: John Desrosiers on March 18, 2014, 11:30:27 AM

I have an old Buntting brothers V1 Thats built but I never drilled out mounting holes. Any good?

That one may have possibilities. If you have any of the specs for the airplane, like wing area, and it's in the 250 square inch range, or like has been already mentioned, less than 300, you may be OK. Someone was thinking about rekitting that and the Oka Bomb, and there may be a thread on the list here that mentions the specification of the airplane.
Good luck and have fun,
Dan McEntee

John Desrosiers · « **Reply #26 on:** March 19, 2014, 04:36:41 PM »

I want to thank all of you for your help. I love this sight

Author Topic: os 20 (Read 4929 times)

Joe Just