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A model for an OS MAX 15?

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A model for an OS MAX 15?

Post  KariFS on Sun Jul 19, 2015 5:00 pm

What size of a model should I look for my mid-70's OS MAX 15? Any examples?

When I surf around outerzone.com I find that the wingspans of models for .15 engines vary from about 30 to 45 inches. Of course plans made in the '50s for a .15 engine assume that the engine is heavier and less powerful than the OS but still there is a lot of variation. I am looking for a robust model that is not very fast but could do some basic stunts. Preferably with a built up wing. The fuselage can be a slab or a box.

Thanks!




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Re: A model for an OS MAX 15?

Post  RK Flyer on Sun Jul 19, 2015 6:16 pm

The Ringmaster Jr., or Nobler Jr. would be good. I am flying a Sig Shoestring with an old fox 15 the flys great, but it has a solid wing & fuse.

Hope it helps, RK Flyer
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Re: A model for an OS MAX 15?

Post  Ken Cook on Sun Jul 19, 2015 6:30 pm

A Flite Streak Junior gets my vote. The JR Ring is not a good example for a stunt plane. Unless built light, it pretty much has the characteristics of a cinder block. The larger .35 Ring flies far superior to the JR. The Flite Streak Junior though has a decent wingspan and square inches.
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Re: A model for an OS MAX 15?

Post  KariFS on Tue Jul 21, 2015 8:11 am

RK and Ken, Thanks for the tips. Kits sold in the USA get expensive when shipped to Europe, and then there are customs fees also, so it's going to be a scratch build this time.

Most of the models mentioned have about 30 in wingspan and fuselages are about 20in. I'll look for something along these lines from outerzone.com.

Thanks again Smile
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Re: A model for an OS MAX 15?

Post  ElectricTony on Tue Jul 21, 2015 8:46 am

My OS Max .15 R/C hauled my Carl Goldberg Eaglet 50 around the sky with no problem. 50" wingspan, at least 2 or 3 pounds with my old Kraft 4ch radio. It was a trainer so not very aerobatic but the engine had plenty of power to do what ever the plane could do. I think I used to run 15% Nitro Cool Power fuel.
OS makes great engines, when I was running fuel they were my engine of choice.
You can check out the Instruction manual for the Eaglet, or any other Goldberg plane here:
http://www.carlgoldbergproducts.com/manuals.html

Regards,
Tony
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Peacemaker

Post  modelbuilder49 on Tue Jul 21, 2015 3:15 pm

Might I suggest the Peacemaker Very Happy  http://www.outerzone.co.uk/plan_details.asp?ID=1633  I found the plans on Outerzone when I decided to try my hand and enter an RCGroups Brit Plan Buildoff a couple of years ago.  I really enjoyed the build and built two of them just for the heck of it.  They will do everything I have the ability to do!!  I tried posting pictures but I must be doing something wrong because they went to www.servimg.com and I' not sure I  know how to get them back!  I really think you might enjoy it as well  Smile .

Jim Carter

https://servimg.com/view/19201836/36
https://servimg.com/view/19201836/37
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Re: A model for an OS MAX 15?

Post  cox24711 on Tue Jul 21, 2015 4:41 pm

my glider !!!!
lol!
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Re: A model for an OS MAX 15?

Post  gcb on Tue Jul 21, 2015 5:22 pm

KariFS wrote:What size of a model should I look for my mid-70's OS MAX 15? Any examples?

First question is, which Max 15?

In 1975 OS dropped the steel finned Max-III for a new OS .15 with a drop-in liner. Do you need to use a muffler (extra weight)?

My vote goes to the Flite Streak Jr. flown on braided steel .012x52' lines.

The profile Peacemaker is an excellent ship sized between the Flite Streak and the Flite Streak Jr. It was sized for a little more power and a modern OS .15 would be better unless you shorten the lines a bit.

George

Edit: Jim, nice looking Peacemaker. What lines do you fly on?
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Re: A model for an OS MAX 15?

Post  modelbuilder49 on Tue Jul 21, 2015 5:38 pm

[quote="gcb"]
KariFS wrote:The profile Peacemaker is an excellent ship sized between the Flite Streak and the Flite Streak Jr. It was sized for a little more power and a modern OS .15 would be better unless you shorten the lines a bit.

George
Hi! Not to necessarily contradict George but that's exactly the engine I'm using on one of my two Peacemaker, the old OS Max .15 with the OS 702 muffler mounted on it and I've used both a Master Airscrew 8x5 prop and an APC 7x6 prop. I can do loops, wingovers, fly inverted, outside loops, lazy eights, pretty much just my skill level for playing around Very Happy ! The second Peacemaker has an OS Max .10 with OS 761 muffler but that just isn't enough power to do much so it's just hanging on the rack until I can get another .15 Wink

Jim
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Re: A model for an OS MAX 15?

Post  Jason_WI on Tue Jul 21, 2015 9:21 pm

modelbuilder49 wrote: The second Peacemaker has an OS Max .10 with OS 761 muffler but that just isn't enough power to do much so it's just hanging on the rack until I can get another .15  Wink

Jim

Here is a nice 15 III R/C.

http://www.ebay.com/itm/252029446077?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649&rmvSB=true
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Re: A model for an OS MAX 15?

Post  KariFS on Wed Jul 22, 2015 2:22 am

gcb wrote:
KariFS wrote:What size of a model should I look for my mid-70's OS MAX 15? Any examples?

First question is, which Max 15?

In 1975 OS dropped the steel finned Max-III for a new OS .15 with a drop-in liner. Do you need to use a muffler (extra weight)?

Here's a picture of the engine:



It seems to be the later model with aluminum fins. I think I will use a muffler, as I want this plane to have longer flight times and since it will be for slightly more advanced training, I will most likely fly it more too. (EDIT: I don't mean that the muffler would give a longer run time but less noise means more tolerance from people nearby and less ringing in my ears afterwards.)

The muffler (#702) weighs about 36 grams or 1,2 oz, so although it feels light, it actually makes for 25% of the weight of the combination. I guess I could use the muffler while practising and when I feel confident, I could remove it, thus moving the CG back a little and ending up with a better power-to-weight ratio.

Thanks again everyone Smile


Last edited by KariFS on Wed Jul 22, 2015 2:44 am; edited 2 times in total (Reason for editing : Clarification)
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Re: A model for an OS MAX 15?

Post  KariFS on Wed Jul 22, 2015 2:27 am

cox24711 wrote:my glider !!!!
lol!

I bet lol!

Actually this gave me an idea. More about that later, maybe Huh...

BTW I still think with your glider you'd be better off with e-power (come on to the dark side, it'll be a hoot Very Happy ) or at least a throttled glow engine Smile

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Re: A model for an OS MAX 15?

Post  cox24711 on Wed Jul 22, 2015 3:01 am

KariFS wrote:
cox24711 wrote:my glider !!!!
lol!

I bet lol!

Actually this gave me an idea. More about that later, maybe Huh...

BTW I still think with your glider you'd be better off with e-power (come on to the dark side, it'll be a hoot Very Happy ) or at least a throttled glow engine Smile

yes i got a medallion 15 rc for drum roll please $50!!!!!!cheers ex model engines are selling one for $99! and mine has never been run since 1965 just kept in a paper bag all that time Sad
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Re: A model for an OS MAX 15?

Post  cox24711 on Wed Jul 22, 2015 3:02 am

KariFS wrote:
gcb wrote:
KariFS wrote:What size of a model should I look for my mid-70's OS MAX 15? Any examples?

First question is, which Max 15?

In 1975 OS dropped the steel finned Max-III for a new OS .15 with a drop-in liner. Do you need to use a muffler (extra weight)?

Here's a picture of the engine:



It seems to be the later model with aluminum fins. I think I will use a muffler, as I want this plane to have longer flight times and since it will be for slightly more advanced training, I will most likely fly it more too. (EDIT: I don't mean that the muffler would give a longer run time but less noise means more tolerance from people nearby and less ringing in my ears afterwards.)

The muffler (#702) weighs about 36 grams or 1,2 oz, so although it feels light, it actually makes for 25% of the weight of the combination. I guess I could use the muffler while practising and when I feel confident, I could remove it, thus moving the CG back a little and ending up with a better power-to-weight ratio.

Thanks again everyone Smile

oh i saw that for sale a while back lol!
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Re: A model for an OS MAX 15?

Post  mitchg95 on Fri Jul 24, 2015 7:55 pm

When I started flying 4 years ago I started with this, it comes ready for a 450 size electric motor, but my uncle and I retrofitted it to fit a os15 la nitro engine, it flew great, nice and tame. It had just the right amount of power
http://www.e-fliterc.com/Products/Default.aspx?ProdID=EFL2875
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Re: A model for an OS MAX 15?

Post  getback on Sat Jul 25, 2015 7:15 am

[img]http://www.outerzone.co.uk/plan_files_01/1633/Peacemaker.pdf I have seen this pan before and was wondering if it had a good rep. Thanks Jim, in Q What are you going to fly RC or UC ?
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Re: A model for an OS MAX 15?

Post  gcb on Sat Jul 25, 2015 11:02 pm

modelbuilder49 wrote:Hi!  ...Not to necessarily contradict George but that's exactly the engine I'm using on one of my two Peacemaker, the old OS Max .15 with the OS 702 muffler mounted on it and I've used both a Master Airscrew 8x5 prop and an APC 7x6 prop.  I can do loops, wingovers, fly inverted, outside loops, lazy eights, pretty much just my skill level for playing around Very Happy !...  
Jim
 
It's a good thing you spoke up. The Max .15 must have a bit more power than I thought since the Peacemaker was designed for the Oliver Tiger .15. Another good plane about that size is a Spanish ship called the Smousen.

What lines do you use with it?

George
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Re: A model for an OS MAX 15?

Post  modelbuilder49 on Sun Jul 26, 2015 10:34 am

Hi Eric! Hi George! I built both of mine for control line flight. I've flown on .015 x 42'-1" steel cable with pretty good success. I've also used a set of .015 x 52'-3" that seem to work just fine but I could probably add a bit more outboard tip weight to counter the extra cable but what the heck it's all been for just fun flying anyway a few .... loops .... inverted .....lazy eights, wingovers .... that's about it!! Very Happy

Jim
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Re: A model for an OS MAX 15?

Post  gcb on Sun Jul 26, 2015 10:47 am

Instead of extra tip weight you might consider using .012's instead of .015's. I think you'll find less bow in the lines and more pull.

George
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