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Sig Astro Hog engine size

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Andrew Cousins06/06/2016 15:08:01
163 forum posts
20 photos

Hi all

Been thinking of my next kit build and been thinking of the astro hog. I have had a look at the builds of the Astro hog on the forum and would like to ask a question.

I am going to be building a Harvard with my son to introduce him to building from scratch. Now this requires a Laser 100 four stroke.

I was wondering if the laser would fit the astro hog as well. Plan being to fly the Hog while building the Harvard. I was thinking of putting it in inverted but im concerned about the possibility of the prop hitting the floor. Any thoughts would be much appreciated.

Andy C

jonryan06/06/2016 15:23:55
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161 forum posts
12 photos

I'm thinking of one of those as well, Andrew. Mine would be electric, though. There's a build thread here

Bob Cotsford06/06/2016 15:34:50
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8070 forum posts
444 photos

A Laser 100 in an AstroHog is overkill Andrew, I had an OS46AX in mine and that power level suited the airframe perfectly. I'd have thought a 70 four stroke would be plenty, not a 100! The AstroHog is quite lightly built and not very draggy unlike the Harvard.

Andrew Cousins06/06/2016 15:36:36
163 forum posts
20 photos

Yes Jonryan I have been looking at that. I'm just concerned that if I put a laser 100 in it swinging a 14x8 or 15x6 prop might hit the deck. So I was hopping some of the guys that have built them would know if it will be an issue. I didn't really want to buy two engines. It gets a bit more expensive when you are funding two in the hobby.

When do you think you will be getting it, if you do of course.

Edited By Andrew Cousins on 06/06/2016 15:37:25

Andrew Cousins06/06/2016 15:42:27
163 forum posts
20 photos

Thanks Bob

Looks like I might be continuing the search for a low wing Intermediate sports kit that will suit the Laser 100 then. Any ideas. Don't want a ARTF I like to build.

jonryan06/06/2016 15:42:46
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161 forum posts
12 photos

It's a mere glint in my eye at the moment. I'm still a rookie. Currently learning on a RTF 3chn lightweight, a heavier 4chn is about to come off the building board ( a Traplet 'Diversion' ), so when I've got the hang of that I want a low winger, and I very much like the look of the Hog, and from what I've read it should be a suitable third model.

 

Edited By jonryan on 06/06/2016 15:43:31

Andrew Cousins06/06/2016 15:49:40
163 forum posts
20 photos

Im getting back into the hobby after a 20 year break so its a bit like getting back on a bike. My son has shown a lot of interest and is coming along well. we are on the seagull rising star high wing trainer at the moment. I managed to get my first landing in (in one piece) after four flights (and twenty years) so its all coming back. I want something to move onto while my son continues on the trainer. was hopping to keep the cost down by getting one engine we could use in a couple of different planes. I may have to rethink my strategy.

Martyn K06/06/2016 15:59:39
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5005 forum posts
3668 photos

SLEC have a giant Astro Hog kit available.

Link

Martyn

jonryan06/06/2016 16:11:23
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161 forum posts
12 photos

Hmm. Odd. That's an 80" and suggests a 20cc engine. It's also a sight more expensive than this one from Sussex models.Presumably in 58 years (!) a number of variants have appeared.

J D 806/06/2016 16:11:24
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1320 forum posts
78 photos

I say a Harvard if any where near scale would not make a good second model,even my seagull SNJ [navy version] has to be flown with the respect demanded by WW2 advanced trainer. No low and slow or snap maneuvers near the ground or it will bite. Couple of astrohog's in our club, nice flyers.

Kevan Gillings 206/06/2016 16:34:10
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25 forum posts

In our club three of us had Hogs, mine had a Enya 60 fs,one of the others had a Laser70 fs and the other had a OS90 fs.

they all flew well, but there was not much difference in flying speed.

Andy Green06/06/2016 16:55:04
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2279 forum posts
67 photos
2 articles

I've just built a Venture 60 from the Plan. I have an OS 80 FS in mine, flies it lovely, a 100 should also be a good fit.

Andy

PS the link by JonRyan is of mine and it has a Saito 62 in.

Edited By Andy Green on 06/06/2016 16:55:42

jonryan06/06/2016 17:06:48
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161 forum posts
12 photos

Hi Andy, yes it is yours! I'm new around here and haven't got to know many of the inmates yet. D'you think a hog would be a suitable first low-wing model?

Martyn K06/06/2016 17:14:08
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5005 forum posts
3668 photos

I think it would be a great fist low winger.

I crashed mine (rx battery/switch failed) about 3 years ago and still miss it.. Its a great and very forgiving aeroplane.

Martyn

Andy Green06/06/2016 17:14:27
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2279 forum posts
67 photos
2 articles

Yes definitely, its a lovely slow stable flyer, capable of aerobatics if required.

A

jonryan06/06/2016 17:18:53
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161 forum posts
12 photos

Ta. Sound just what I need, then.

Andrew Cousins06/06/2016 18:01:46
163 forum posts
20 photos

Hi Guys

Martyn K that is huge a little big for me I think at the moment. If only they done one in-between the two sizes.

John Davies 8 yes I thought it may be a bit adventures but I have flown quite a few different models including a Brian Taylor typhoon I built. But that was 20 odd years ago. The Harvard would be built slow time as I would be doing it with my 11 year old son and teaching him build from scratch as we go. So we are probably looking at close on a year to build it and in that time we should be up to scratch ( well hopefully I will be back to wear I was 20 years ago)

Kevan Gillings 2 the hog that had the OS 90 FS how was it mounted? any issues with the prop hitting the ground.

Jon - Laser Engines06/06/2016 18:12:26
4901 forum posts
193 photos

We normally sell the 80 for the good old hog and they fly very sedately at reduced throttle. You could use the 100 without issue but you would need something like a 15x8 or 16x6 prop and would fly 90% of the time under 1/2 throttle

Robert Parker06/06/2016 18:22:21
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919 forum posts
1182 photos

Hi Andrew,

My current Flair Astro Hog is fitted with an RCV 58 which has plenty of power. My first Hog had an OS52FS again plenty of power.

Also think about the tank size, what is the largest that can be fitted in to the airframe. I get flights of around 20 - 25 mins at a low throttle setting.

Regards

Robert

Kevan Gillings 206/06/2016 19:33:39
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25 forum posts

Hi Andrew, the motor was upright, it would have had a 14"/15" prop fitted, I don't think there was any problems with it.

Don't forget in the plans service there is a smaller version for a 40 size motor ,the plan by Bodo (RM 283) there was also a very small one called Astro Hoink (may be X list) ( I think) I think it was a free plan.

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