Sig Astro Hog "Engine recomendations

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Sig Astro Hog "Engine recomendations

I didn't install the servos ( Standard JR 517's) side by side in the center of the wing,but on the outer panels. See attachment.
Ugo

Mike, your Hog looks great! That looks like a great job at covering. Dan, I built mine by the plans for the dihedral, it seems to work just fine. This is definitely one of those planes that will make you look like a better pilot than you really are

Here is a pic of my hog

Saito 91
extended rudder
2 aileron servos
changed and moved landing gear forward

Don't worry too much about maintenance on a 4-stroke. I've been flying them for years without any problems. I have everything from an OS .26 to a Saito 300 twin. If you use good 4-stroke fuel and don't run them lean they can be as easy to care for as a 2-stroke. In all the years I've been flying 4-stokes (always Saito or OS) I have only had to adjust the valves on 1 and that is really easy to do.

Wyoming Wind Festival Jan 1 to Dec 31

Interesting web site for the Astro Hog.

Also check out this guys Blue and Yellow Stearman BiPlane I beleive on page #2 and click on it for more pics. Super NICE! I wonder if that's an ARF, Scratchbuilt, or a Kit?

Final decision. O.S. FS-70 ll Surpass . duel servo's in the wing . tail dragger. dihedral acording to plans.

Thanks for all the nice pics and help!

The last Hog I built had an OS .91 4C in it and performed nicely. Just for fun I set it up the same way I set up pattern planes using wing mounted aileron servos as suggested. I also put an elevator servo in the back, pull-pull rudder and mechanical retracts. If you think a Hog looks good as a taildragger you should see it with the wheels up. Wow!! I do strongly reccomend cutting the dihedral in half. It looks better to me and will roll much better. Whatever you do it will be a good plane.

Howdy bigdanusa,
If you put the landing gear in the wing beef up the ribs significantly. I like the gear mounted on the fuselage right in front of the wing saddle.
I think you will be pleased with the OS 70 4 stroke. I do not think you will have any trouble with this engine. I would buy or borrow a tach to set the needle, it is hard to set a 4 stroke by ear. Let us know how the build goes.

O.S. 70 Surpass 4-Stroke 13-6 prop, duel aileron servo's, took out half the dihedral plans called for, mounted landing gear under fusalage to prevent nose-overs. Futaba 3004 standard servo's. Camera takes bad color pics. It is covered in cub yellow and insignia blue monokote. Windshield, canopy and cockpit moulding are on but pic below is not up to date. Lots of carving and sanding on this hog after 3 months. Looks a lot better in person and lots of work building it.

Thanks for all the help and advise on here.

She's just BEAUTIFUL, Dan !! I'll bet if you kept all the shavings, you could almost build another one !! LOL ! I know how much work you put in it Dan. But She's worth it ! Let us know how the test flights go. Remember, She's like an old mule. She don't like to be pushed !

I took your advise and kept the teeth sharp on the chainsaw!

I'll add a new pic that has the canopy and windshield on it soon. The colors look a lot better here than in the pics! I like my Hog so well that I now have a Sig Hog Bipe here for my next project.

You'res looks real nice Ugo!

I'll throw in my 2 cents. Dual ailerons, fuse mounted gear, about 1/2 recommended dihedral. Flying here in 'mile high' land, I've had success with OS .91FS turning 13x8 but even more fun with the Saito 1.00 and 14x8. Plane is also an EXCELLENT float flyer.

I'm considering building another (someday) with retracts. Anyone tried that yet?

If it were me, I'd go with an OS 91 Surpass

I'm saving the O.S. 91 Surpass for my Hog Bipe.

Thanks for the recommendation though.

I'll let ya know if I should have taken your advise after the maiden flight. Thanks anyhow for the advise.

Here's a pic of mine -

Thunder Tiger .91 4-stroke with a MA 14x6. 1/2 the dihedral. Dual standard airleron servo's. I also mounted the main gear on the fuse.

In other threads about the Hog, somebody always seems to bring up a fact about the Astro Hog. The original was a pattern plane that was winning conests with a .35 size 2S engine carrying radios that were often at least twice the weight of todays' radios.
I just figured it might as well be me.

50-
That plane was a lot different. Flair had a kit out a few years ago that was true to the original. I had one and it flew nicely on a .40. But the finished weight was less than 5 pounds. It used rubber bands to hold on the wings and stab and was just constructed lighter all around. It was a good plane but I think I prefer the Sig version --- really tough plane.

My astro hog again with the canopy on it. Colors are still bad from my camera. Can't wait to fly it.

Well, I started breaking in my 4 stroke. Now I'm just waiting for a nice day to try it out.

I have the balance point about 1/8 of an inch towards the rear from the suggested point. I hope that 70 surpass has enough power to get it airborne on it's maiden flight.

Thanks for all the help.

I'm sure you'll have plenty of power. I first flew my hog bipe a couple weeks ago with a Saito 72, more weight and more drag (surface area) than the astro hog and she took off I think in about 50 feet or less after full throttle. Just gracefully rose off the ground (grass) and flew as good as anything I've got. I'm having an astro hog built right now as I don't think my chain saw can do another with out overhauling lol, and hope to have it in the air by mid summer. Putting either an OS 70 4s or a Saito 72 on it too. Oh, and putting foats on it for the wet stuff. I think both would make great float flyers. Let us know how your maiden goes! I wanted to build the astro hog first but the hog bipe came in first and I had a real itch to build something so I started on the bipe. I need a bigger shop so I can do more than one at a time! Oh and as far as power/cubs, etc goes. I have a Saito 56 on my H9 cub (81" span) and I couldn't dream of any more power for it even on floats for breaking the water suction. Of course it's the standard wing (not clipped).

Good luck,
soon to be hog flying in NC
Jim