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  #1  
Old 12-15-2016, 12:02 AM
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JumpJet JumpJet is offline
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Default OHKA “BAKA Bomb”

I’m not sure what the correct spelling is for this rocket powered Japanese flying bomb but I’ve been- wanting to make one for some time now. The illustration below shows what I am talking about. One photo shows the inner structure of the fuselage. I will strip plank the fuselage with balsa while all the wing will be sheeting foam. Its scale is only 1/10 so it’s not a big model at only 23.7” long. I predict the flying weight as a glider will be around 6 ounces and I don’t believe I will stick a rocket motor in it. So although this technically won’t be a rocket power model it will be pretty cool when it’s done, so I wanted to share it with you. The reason for its small size is because the Betty Bomber the BAKA will be dropped from is FREAKING large at 1/10 scale. One image shows the BAKA fuselage next to the Betty Bomber being framed up. If you not familiar either of these subjects I’ve include a picture of a plastic display showing both.

There is a build thread over at RCGroups.com and I can share the link if anyone is interested in seeing the models being built.

John Boren
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Old 12-15-2016, 06:56 AM
jetlag jetlag is offline
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Yes, John, the link would be great.

Allen
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Old 12-15-2016, 08:04 AM
tab28682 tab28682 is offline
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I would have to set it up for an 18mm D2.3.

You could always fly it as an unpowered model, even then.
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Old 12-15-2016, 08:54 AM
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Link to Build.


https://www.rcgroups.com/forums/sho...-24-Betty-Build


I did not know Aerotech had a 18mm long burn D3 motor. I use their C3 motor in my RC Rocket Glider.

John Boren
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Old 12-15-2016, 10:02 AM
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"Ohka" and "BAKA" are the correct spellings for this thing.
The ONLY correct name however is BAKA, which translates to "Idiot" and "Stupid Fool" in Japanese.

Be a steely-eyed rocket man and power it with an 18mm D10 instead of a wimpy D2.3. That way it will be "hard to handle" in a scale-like manner just like a real rocket-plane.
Better yet would be an 18mm D21/D24.
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Old 12-15-2016, 11:03 AM
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Yup, if you can handle the weight and CG shift, the 18mm d2.3 is a nice motor for airstarts, I think it weighed about 1 oz loaded in the standard 18mm case with a jb plugged forward closure, 8 second burn I think. However looking at the top view, your wing is pretty far forward, so it might take quite a bit to compensate for the tail weight and then cg shift might be a bit more than desired...plus you need to carry ignition battery/igniter for air start...might start to get heavy.

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Old 12-15-2016, 07:35 PM
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ghrocketman ghrocketman is offline
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Even a BRICK with "fly" provided you have enough thrust.
You need to make this thing powered. Really.
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Old 01-06-2017, 05:43 PM
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Fuselage is now planked. I need to do a final sanding to make it smooth.


John Boren
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Old 01-06-2017, 09:36 PM
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BAKA fuselage sanded. I will need to use some light weight filler in a few areas to fill in a few areas.




John Boren
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  #10  
Old 01-06-2017, 10:54 PM
Vanel Vanel is offline
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Lookin' good!
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