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AJ/JW .020 Firebaby Jr.  Pretty neat Cox_ba12




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AJ/JW .020 Firebaby Jr.  Pretty neat Empty AJ/JW .020 Firebaby Jr. Pretty neat

Post  rsv1cox Tue Jun 04, 2024 12:48 pm

Arrived today, nicely packed.  Cox .020, metal weights, Cox .020 propeller, some Wen Mac parts, different JW handle.  Lots to explore.

AJ/JW .020 Firebaby Jr.  Pretty neat P1017723

AJ/JW .020 Firebaby Jr.  Pretty neat P1017721
AJ/JW .020 Firebaby Jr.  Pretty neat P1017724

AJ/JW .020 Firebaby Jr.  Pretty neat P1017722
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Post  rdw777 Tue Jun 04, 2024 3:56 pm

That is pretty neat Bob, Probably a little more rare than the other Firebaby versions…. I don’t believe that P-26 on the wing though LOL!!!….Thanks for the comparison shots, Interesting… The plastic fuse seems nearly as long as the .049 version but the wing is a good bit smaller than original Firebaby…. I’m guessing it would be a bit of a hot rod with the PeeWee on it….Do the instructions have a line length?….I think PeeWee .020’s are nearly, Or maybe even more powerful than some of the older.049’s….When you get a chance will you weigh it por favor?…. Just curious
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Post  rsv1cox Tue Jun 04, 2024 4:52 pm

I haven't had a chance to put it together yet Robert.  Nut and bolt construction retains the wing and I'm not great with those little 2/56's but I will get to it and post a weight.  Those metal weights are heavy, I 'm not sure it would get off the ground with all attached, would act more like a plow I think.  

AJ/JW .020 Firebaby Jr.  Pretty neat P1017725
AJ/JW .020 Firebaby Jr.  Pretty neat P1017726

A clone is a must.  But this time Hobby Lobby balsa!!!!! No more making do.  1/16" fuselage with external ribbing.  I'm still thinking about a decal for the wing, big one split in half and applied.  A chunk taken out of the leading edge. A wedge of balsa and food coloring to match maybe.  Box end says with .020 Cox Eng $4.98.  Control lines once attached but the engine shows no signs of ever being fueled.  

AJ/JW .020 Firebaby Jr.  Pretty neat P1017727
AJ/JW .020 Firebaby Jr.  Pretty neat P1017728
AJ/JW .020 Firebaby Jr.  Pretty neat P1017729

Wen stuff.

AJ/JW .020 Firebaby Jr.  Pretty neat P1017730
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Post  getback Wed Jun 05, 2024 9:16 am

That is a new one on me the Jr. never heard of it . A lot of weight up front , did any instructions come with it ? Bee interesting to see where the CG is when put together . Hard to read https://www.worthpoint.com/worthopedia/vintage-jim-walker-american-junior-3766318702
Just as i thought ((( "Variable CG". The engine mounts with three steel plates (weights) to provide a forward CG making the Firebaby Jr. a stable basic trainer. As the novice pilot develops his skills the weights can be removed one at a time to cause the little plane to become more maneuverable. It works! ))) from the site
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Post  getback Wed Jun 05, 2024 9:31 am

This guy says he has the plan but no pic > https://www.model-plans.co.uk/jim%20walker.htm
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Post  rsv1cox Wed Jun 05, 2024 10:27 am

getback wrote:This guy says he has the plan but no pic > https://www.model-plans.co.uk/jim%20walker.htm

Thanks Eric. I have plans, yellowed with age but readable.

Scans:

AJ/JW .020 Firebaby Jr.  Pretty neat Scan_234
AJ/JW .020 Firebaby Jr.  Pretty neat Scan_235
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Post  rsv1cox Wed Jun 05, 2024 8:40 pm

I may have just enough 1/16" to do it. Box repair etc. I have no steel sheet but I do have aluminum which would be easier to work for the clone.

AJ/JW .020 Firebaby Jr.  Pretty neat P1017740
AJ/JW .020 Firebaby Jr.  Pretty neat P1017739
AJ/JW .020 Firebaby Jr.  Pretty neat P1017741
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Post  MauricioB Thu Jun 06, 2024 12:53 am

Roberto, I wonder why in the design they carried out placing so many iron counterweight plates...perhaps a cost issue to modify the matrix to make a fuselage with a longer nose moment??
I have worked in design companies and many times, due to cost reasons, they decided to solve "a problem" by making an "adjustment" to a piece, instead of fundamentally modifying the design matrix. Could this be the case?
Flying with all that weight up front doesn't seem like a good idea to me, an impact would be much more serious for the engine, potentially compressing it due to inertia and breaking some of its parts...just thoughts...
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Post  rsv1cox Thu Jun 06, 2024 9:39 am

Flying with all that weight up front does not make much sense to me either.  I don't think it would get off the ground as they are very heavy and the wing area so small.

The idea is, as you get better at flying remove steel plates one at a time shifting the CG further backwards making the plane more maneuverable but less stable.  

Bob
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Post  rsv1cox Thu Jun 06, 2024 9:31 pm

The box is nasty but repairable. First thing is to remove the masking tape. A warm Monokote iron works good. Just heat it up and pull it off at zero angle back over itself. It will leave a sticky residue. Howard Feed-N-Wax removes it. Citris base Orange oil.

AJ/JW .020 Firebaby Jr.  Pretty neat P1017743
AJ/JW .020 Firebaby Jr.  Pretty neat P1017742
AJ/JW .020 Firebaby Jr.  Pretty neat P1017744

I can get all the clone pieces cut from a sheet of 1/16" left-over balsa. The comparison to the P-26 is kind of laughable but it does referance it on the box.

AJ/JW .020 Firebaby Jr.  Pretty neat P1017745
AJ/JW .020 Firebaby Jr.  Pretty neat P1017746
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