Sig Akromaster build.

JPvelo Sun Nov 25, 2012 6:54 pm

Fed ex man dropped the kit off yesterday and I started gluing the preliminary bits today. I am going to go with the extended wing.
Initially power will be my sportsman .15 but I may want to switch to a fox .15 down the road.
Question for everyone out there:
Does any one have a sportsman and a fox .15 they can put side by side and compare the mounting pattern? This would be much appreciated. Thank you.
Jim

**Cribbs74** Sun Nov 25, 2012 8:35 pm

Well, lets see some pics!!

I don't have a Sportsman anymore but I do have the instruction sheet with dimensions. I also have a Fox .15x of you want me to take pics or send data let me know.

Ron

JPvelo Sun Nov 25, 2012 9:42 pm

The only pics would be of the leading and trailing edge halves glued together. This build will be slow going as I will be working on it with my son when we have time.

If you could measure the mounting holes on the fox and see if they match up with the specs you have on the sportsman that would be great. If you could measure the distance from the front mounting holes to the front of the driveplate on the fox it would be much appreciated.
Thanks,
Jim

JPvelo Mon Dec 30, 2013 6:52 pm

Finally dug this thing out and intend to finish it! Wing is almost done. I will be replacing the 1/2a bellcrank the kits came with with an aluminum 3" item.
Sig Akromaster build. AgPS6uH

Want to hack it into a Piper Pawnee:
Sig Akromaster build. LYdcjUC

Will keep you posted!

Jim

**Cribbs74** Mon Dec 30, 2013 6:59 pm

Jim,

I never saw where you asked me for that info. Do you still need the dimensions?

getback Mon Dec 30, 2013 7:31 pm

JPvelo wrote:The only pics would be of the leading and trailing edge halves glued together. This build will be slow going as I will be working on it with my son when we have time.

If you could measure the mounting holes on the fox and see if they match up with the specs you have on the sportsman that would be great. If you could measure the distance from the front mounting holes to the front of the driveplate on the fox it would be much appreciated.
Thanks,
Jim

Is this it for him Ron?

JPvelo Mon Dec 30, 2013 7:33 pm

Cribbs74 wrote:Jim,

I never saw where you asked me for that info. Do you still need the dimensions?

We're good, I went ahead and bought a Fox .15.

Jim

**Cribbs74** Mon Dec 30, 2013 8:46 pm

I probably should have worded that better...

Yeah you did het a new .15, I see it now. Those .15BB engines are real screamers and very smooth. They do not 4-2 though.

I want one, but I am getting no love from Fox manufactuing.

Ron

JPvelo Tue Jan 07, 2014 11:23 pm

Made good progress today. Decided to go with the stock bellcrank and sheeted the wing.
Sig Akromaster build. N0DHW1v

When I epoxied the doublers over a year ago they slid, leaving a big gap at the leading edge.
Sig Akromaster build. DrqAMY3

My solution is to add 3/16 balsa "triplers" on each side. They also hide the seam where the addition meets the stock fuse at the doublers.
Sig Akromaster build. 7lSwQ8u

I decided the lines of the fuse lent them self to a turbo prop duster more than a Pawnee. My son likes this scheme, minus the razorback logo and with transparent red wing covering:
Sig Akromaster build. MrPLtGG

Jim

OVERLORD Wed Jan 08, 2014 1:21 am

That transformation turned out well Jim. You didn't get any problems when removing those wing tips?

Lieven

JPvelo Wed Jan 08, 2014 9:11 am

OVERLORD wrote:That transformation turned out well Jim. You didn't get any problems when removing those wing tips?

Lieven

Wingtips came off fine, going to replace them with 3/8 balsa "cap ribs". I am also toying with the idea of adjustable leadouts and a tip weight box.

Jim

JPvelo Thu Jan 09, 2014 6:58 am

After I put the cheek blocks on I realized I didn't leave a way to install the landing gear. Came up with an easy fix:
Sig Akromaster build. Kgapy8p

I think I'm to the point of filling the fuselage, I will try Rustys' spackle technique followed by silkspan/polycrylic.

I don't know if I am going with sewn hinges or I may try actual hinges.

Jim

**RknRusty** Thu Jan 09, 2014 8:12 am

Looks nice, I've never seen an Acromaster in real life. My LG on the Yak is similar and pondering ideas of how to secure it. I was also thinking of springing it with a rubber band somehow, since as a sport flyer it'll be more likely than my stunter to smack the gear at the bottom of some sort of spontaneous exotic maneuver. Maybe I'll invent a new dangerous trick... a Rustio. lol!

Rusty

JPvelo Thu Jan 09, 2014 9:25 am

I have a sig twister on order at the hobby shop, I also have a fazer landing gear on order:
Sig Akromaster build. LMz6GIp

I plan on installing hard wood mounting blocks between the doublers. If I bugger the gear I can easily replace it. But that's another whole build thread.

Jim

roddie Thu Jan 09, 2014 9:48 am

JPvelo wrote:After I put the cheek blocks on I realized I didn't leave a way to install the landing gear. Came up with an easy fix:

I think I'm to the point of filling the fuselage, I will try Rustys' spackle technique followed by silkspan/polycrylic.

I don't know if I am going with sewn hinges or I may try actual hinges.

Jim

Hey Jim, Any reason why these wouldn't work for you? The steel type I have used on several models.

EDIT- I use 2-56 machine screws/nuts I get from Radio Shack.. instead of the wood screws that come with them. This tightens the straps down nice and locks the gear into place.

Roddie

Sig Akromaster build. Landin10

JPvelo Thu Jan 09, 2014 11:21 am

Roddie, if I could have found those metal ones locally yesterday I would have gone with them.

Jim

**Cribbs74** Thu Jan 09, 2014 12:24 pm

Jim,

It's been my experience that the straps do work however they are not very forgiving and get stressed during anything, but perfect landings.

What you came up with is a good compromise as it will allow for a bit of absorption and will not fully collapse like the Goldberg series of models.

Another option would be 2 piece wire gear that attaches through the fuse with a collar. It looks just like a solid wire except it allows for removal with destroying the wing/fuse.

I have pictures if interested.

Ron

JPvelo Thu Jan 09, 2014 9:54 pm

Ron,
I would like to see pics of that system.

Thanks,
Jim

**Cribbs74** Thu Jan 09, 2014 10:04 pm

Ok Jim,

Check back tomorrow. I will post pics then.

**Cribbs74** Fri Jan 10, 2014 8:55 pm

Here ya go Jim,

I wasn't in the mood to take things apart, but I drew a picture and took a picture. If you can't see what's going on I will take it apart.

Sig Akromaster build. 5yKZytul

This is what it looks like in place. I used square tube as it's stronger than the round stuff. I would insert a hard wood plug in the fuse and drill the hole through it. I didn't and wish I did.

Sig Akromaster build. E1p2QJ7l

batjac Fri Jan 10, 2014 10:41 pm

Well, I'm going to have to keep track of this thread now. I spent all my Christmas money on C/L stuff, and one of the things I ordered was an Akromaster. I bought one back in '82, but never built it. I scavenged the wood out of it 20-25 years ago. So, on a wild hair, I ordered another one to actually build this time, as the Akromaster was "technically" the first balsa C/L plane I ever bought. Was thinking of putting a Medallion .15 on it. Would the Medallion .15 be enough for this plane? UPS says it should be here on Monday.

The Technical Mark

duke.johnson Fri Jan 10, 2014 10:49 pm

I don't know about the Cox 15, but the fox 15 and OS 15fp's and LA's are great. Some guys run OS 10LA's in them. It was our first real plane. My oldest son and I both built one. Great little planes. I have a kit in the closet and my daughter is building one, STILL. I want to make my next one electric.

RK Flyer Sat Jan 11, 2014 12:57 am

batjac wrote:Well, I'm going to have to keep track of this thread now. I spent all my Christmas money on C/L stuff, and one of the things I ordered was an Akromaster. I bought one back in '82, but never built it. I scavenged the wood out of it 20-25 years ago. So, on a wild hair, I ordered another one to actually build this time, as the Akromaster was "technically" the first balsa C/L plane I ever bought. Was thinking of putting a Medallion .15 on it. Would the Medallion .15 be enough for this plane? UPS says it should be here on Monday.

The Technical Mark

Hello Mark,
I was at the Jan 1st Fun Fly in & talked with Duke about the Akromaster soooo I found one at Ted's H.S. in Portland. I haven't started building yet so maybe we can compare notes. I plan on using my Enya 15.

RK Flyer

**RknRusty** Sat Jan 11, 2014 3:27 am

I can't imagine a Tee Dee .15 being any less powerful than any of those others. But unless it's a .15 Special, that's the one that had piston seizing problems if I recall correctly.

Rusty

**Cribbs74** Sat Jan 11, 2014 8:22 am

The Cox .15 would probably do just fine. Problem would be it weighs less than the others.

Ron

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