HOB 1/12 scale P-47 - RC Groups
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Oct 09, 2017, 06:06 PM
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HOB 1/12 scale P-47


Hey guys,

I just picked up a House of Balsa 1/12 scale P-47 and also a HOB 1/12 scale mustang from a fellow RCG member on the classifieds here. I noticed that there is very little on the web concerning this plane and nothing in the way of build threads that I can find. My intent is to scan the plans so that I can build more than one and also make templates of the parts and a mould of the canopy/turtle deck so that I can also make a duplicate (though I may only make it of the canopy portion and do the turtle deck in built up balsa).

Anybody done one of these, and if so, any special considerations? I might also add that I will probably power it with an OS .10 or one of my AP .09s that I have laying around, so a redesign of the nose will be needed.

Mike
Last edited by gmwahl; Oct 10, 2017 at 12:52 AM.
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Oct 09, 2017, 07:17 PM
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Amp Abuser's Avatar
Some inspiration for ye

Can you adjust to use a OS .20 four stroke?
It would Raawk der Casbah.

Rc P-47 Thunderbolt Moki 250cc (2 min 52 sec)



The Clash - Rock the Casbah (3 min 40 sec)


37.9M Hits
Last edited by Amp Abuser; Oct 09, 2017 at 07:46 PM.
Oct 09, 2017, 11:06 PM
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Might as well put a .40 on it.
Oct 09, 2017, 11:43 PM
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Amp Abuser's Avatar
Lol yes heavy engine arrggg. around 9oz as I recall.


House of Balsa 1/12 scale P-47
SPECIFICATIONS:
Wing area: 216 sq. in.
Wing span: 36 in.
Length: 28.5 in.
Weight: 20 to 28 oz.
Engine: TD .051 to.10
Wing loading: 14.6 - 18.6 oz./sq. ft.



36" span can handle a .20, personal effort around 1991 used a 2oz tank engine
is a mizer. 8x6 for some speed, 9x4 / 5 for thrust. Switched to a 26 surpass had to
move up to a 3oz tank. Was my own design I don't know it it will work with this
kit just a whimsical moment.

Also did a fun fly type with the .26 using a 30x7 wing 210 sq. the engine was just in
front of the leading edge to obtain balance / 4oz tank flew for long flight fast but landed
with ease amazing enough. Folks could not believe their eyes plane size did not seem
like it would float in more looked like a rocket which it was fast. Got to make another one day.
Never hand launched always off a asphalt runway.

Pic
Last edited by Amp Abuser; Oct 10, 2017 at 12:38 AM.
Oct 10, 2017, 01:04 AM
Registered User
Haha, I love the clash and that song. I was in junior high when it came out!

I'm sure I COULD shoehorn a .20 4 stroke in it, but just getting my hands on one would break the bank! I'll just modify it to take a .09 or .10 and keep it as light as possible.

That moki is insane! That plane looks and sounds so realistic that it could fool almost anyone.

I suppose I'll do a build thread when I build it this fall/winter so that I can help any others along the way that may have this kit and want to build it. Another reason for having the plans scanned along with a parts template sheet is that it can then be scaled up or down to suite everything from a .020 to a .25. Anything bigger than that has already been done in another kit by other designers and I'm not trying to reinvent the wheel.

Time to put my old bones to bed now, I just finished packing out two elk on my back over many trips and I feel beat! I'll dream and think on it some tonight and figure out what I want to do with this build tomorrow.

Mike
Oct 10, 2017, 08:43 AM
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Magnum XLS .15 Option


Our club currently race two pole pylon with a .15 size engine in the unlimited class. We use various models of that category, one being the HOB P-47.
The fellows that use the P-47's fly the Magnum .15xls series engine. Basically a O.S. clone. It is a good runner using an 8x3 - 8x4 prop- 15% nitro / 18% oil. Plenty of power and not to heavy either. The plane flies nice with that power combo. In fact the winner of our summer series in the unlimited was the plane as described above. Hope this gives you some ideas on power applications.

Race 66
Last edited by RACE 66; Oct 10, 2017 at 09:11 AM.
Oct 10, 2017, 09:38 AM
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toad007's Avatar
We used to run a 15-300 class, we used the Magnum XLS or the ASP. The parts interchanged
We could modify the engine but had to use the supplied mufler. The class didnt live long as electrics took over. Like a crazy man I modified the hell out of mine. I put in turbo plug inserts that really helped and of course all the timing mod's, venturi etc. I ran 6.5x5 props well over 21k
The minimum wing area was 300sq". I think at near 200sq" and 28oz they would fly like a turd sinking in a bowl. Just saying. The .09 or the .10 would be max for me if I wanted a good flyer. Nothing turns worse than too high a wing loading or applying wrong rudder.
Last edited by toad007; Oct 10, 2017 at 10:03 AM. Reason: speeling LOL
Oct 10, 2017, 09:55 AM
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It's hard to imagine the point of going bigger than a .10 for a plane designed for a TD049.
I would probably go ahead and opt for the Nelson 40 though. It would be fast that way. Probably use the 6x6 electric prop on it.
Oct 10, 2017, 09:58 AM
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toad007's Avatar
Quote:
Originally Posted by dan berry
It's hard to imagine the point of going bigger than a .10 for a plane designed for a TD049.
I would probably go ahead and opt for the Nelson 40 though. It would be fast that way. Probably use the 6x6 electric prop on it.
LOL! I hear dat!
Oct 10, 2017, 10:43 AM
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Amp Abuser's Avatar
HOB as a P51 flew fine in vids with .25 size engines on Youtube.
For pylon I certainly can understand needing the extra lift to keep from scrubbing off
speed in the turns. The plane would be a floater on a cox TD.049

Mustang P-51 .20 House Of Balsa (1 min 2 sec)


House Of Balsa P-51D Landing (1 min 3 sec)


P-51 House of Balsa kit (3 min 39 sec)
Last edited by Amp Abuser; Oct 10, 2017 at 11:01 AM.
Oct 10, 2017, 11:20 AM
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Toad. Nice backplate mount and turbo insert. I just made a new head for mine. Not a pretty blue any more. I thought it was a copy of Novarossi, I don't know of any OS .15 that looks like that. Is that a Fora needle valve?
Oct 10, 2017, 11:32 AM
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toad007's Avatar
I think that needle came from Galbreath, maybe a ....hellifino, I cant remmeber
This engine was a Magnum or ASP. The mount was easy to make.
The rules made us use these, No O.S.'s
If I mod'd the insides, I would engrave "CHUB" on the side for quick ID
I have a stock one here somewhere, Im thinking it would be fun in a sig doubler or this HOB
Last edited by toad007; Oct 10, 2017 at 11:43 AM.
Oct 10, 2017, 01:39 PM
Registered User
ALL the HOB 1/2 A models were the same design, with Minor variations.
Mostly in the vacuformed turtle deck canopy.
These flew decently ( moderately quick and agile) on a Td 051 ... IF... one kept the weight near 20 oz. Mine did
Over that weight they quickly became sluggish, so an 09 was necessary.
Given that Avionics 'back then' were in the 7 ounce! range.
It could be easy to build a 16/17 oz rtf model .
IMO One would need bungle the build to grossly exceed 10/12 oz on the finished airframe. Sans avionics
So an 051 could do 'Fine' . Although a Norvel is a superior motor, power and throttling wise.
One could even fit a Norvel 074.
Oct 10, 2017, 03:46 PM
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Amp Abuser's Avatar
http://www.rcuniverse.com/forum/1-2-...ml#post5976131


P-47 HOB
Specs:
AUW - 22oz
Engine - Norvel .074 inverted
Servos - Hitec HS65
Radio gear - Spektrum
Battery - NiMH 600maH
Oct 10, 2017, 06:12 PM
Registered User
[QUOTE=Amp Abuser;38428282] "HOB as a P51 flew fine in vids with .25 size engines on Youtube.
For pylon I certainly can understand needing the extra lift to keep from scrubbing off
speed in the turns. The plane would be a floater on a cox TD.049 "



That plane in the videos is a HOB .19-.20 sized P-51 with the 43" wingspan. I've built several and they are Awsome fliers on a .25. One of my favorite planes.

Just for fun I grabbed one of my OS .20 fp engines and put it over the plan......it dwarfed the engine area, so I think it would be a guided engine with one of those in the nose.

I think the .09 or .10 will work pretty slick with some modifications to the nose, like moving the firewall back an inch or so. I know I'll need to make a new firewall, but it will be worth it and I'll just have a little more nose shaping to do.

Mike


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