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Cox Engine of The Month
February-2024
1/2A Nut's

"RC Speed Boat Power Drive TD .020"

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Strato Bug question Empty Strato Bug question

Post  Cox International Thu Apr 12, 2018 3:20 pm

According to the manual, Strato Bug uses a 302-A head. Is that the small-diameter thread version?

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Post  crankbndr Thu Apr 12, 2018 3:45 pm

here is two from my stash

Strato Bug question Dsc01720
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Post  Cox International Thu Apr 12, 2018 4:10 pm

So, are they small-tread? As in for early version Space Bug Jr.
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Post  crankbndr Thu Apr 12, 2018 4:17 pm

No 56 and later means larger thread
But every time I make a blanket statement about Cox I usually regret it
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Post  Cox International Thu Apr 12, 2018 5:08 pm

That is also our understanding but we have two new Strato bugs; allegedly 1955 is the only year they were made but both have the regular-thread glow head. However, they do take a 302-A glow head, which seems for 1956 and later.

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Post  crankbndr Thu Apr 12, 2018 5:20 pm

What cyl. profile are they?

Strato Bug question Cyl210


Mark is the Strato expert, I just refer to his website at Yahoo.
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Post  Mark Boesen Thu Apr 12, 2018 5:32 pm

i think Mud said that some of the later Stratos used the 301-A head, more than likely when a product was noted as new for '19XX' production started in the fall the previous year for the Christmas market.
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Post  Cox International Thu Apr 12, 2018 5:48 pm

crankbndr wrote:What cyl. profile are they?

Strato Bug question Cyl210


Mark is the Strato expert, I just refer to his website at Yahoo.

One each of the two in picture. We know the one on the left is the wrong one and the seller is trying to find us the correct one but all the ones he has with correct profile are the small-diameter ones.
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Post  crankbndr Thu Apr 12, 2018 6:39 pm

My Strato cyl is the one on the left

Strato Bug question Dsc01722
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Post  Mark Boesen Thu Apr 12, 2018 10:36 pm

Cox International wrote:
crankbndr wrote:What cyl. profile are they?

Strato Bug question Cyl210


Mark is the Strato expert, I just refer to his website at Yahoo.

One each of the two in picture. We know the one on the left is the wrong one and the seller is trying to find us the correct one but all the ones he has with correct profile are the small-diameter ones.

lol, Mud is the king of all Thimble-Drome! just about everything i know is from him! From what i remember, the Strato came out in '54 and ended in '55 with the intro of the Babe Bee in '56. It basicly was a Space bug, with a stunt tank and Space Bug Jr. backplate. toward end of production the 301-A head/cylinder was used.

The 301-A is on the left
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Post  Mark Boesen Thu Apr 12, 2018 10:44 pm

Strato Bug question Dsc01710
I'd look for the period correct glowhead, the one with the decorative fin at base of head, probably more than 301/301-A head, cyl. a yellow Kay-Sun prop is also a nice sign.
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Post  Cox International Fri Apr 13, 2018 2:28 pm

Alright, it looks like there may have been running change between production runs.

However, our understanding is that this Strato Bug has the wrong glow head: https://www.ebay.com/itm/1955-COX-049-STRATO-BUG-Model-Airplane-Engine-NEW-Scarce-Engine-NICE/352275800757?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

In which case we are looking to buy a new 302-A head (with the bigger thread) that has the decorative ring at the bottom.

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Post  Mark Boesen Fri Apr 13, 2018 2:58 pm

yep, definitely. that plug is from the seventies.
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Post  GallopingGhostler Sat Apr 14, 2018 6:40 am

Cox International wrote:However, our understanding is that this Strato Bug has the wrong glow head: E-Bay: NOS 1955 COX .049 STRATO-BUG Model Airplane Engine In which case we are looking to buy a new 302-A head (with the bigger thread) that has the decorative ring at the bottom.

E-Bay item #352275800757 photos:
Strato Bug question Cox_0412
Strato Bug question Cox_0413

Went for $598.88 US, higher than I imagined, I gather they are very rare, extremely clean even with wrong head. Popcorn
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Post  Cox International Sat Apr 14, 2018 11:32 am

When we bought this engine, we did not catch the wrong head.
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Post  getback Sat Apr 14, 2018 12:38 pm

I think i have seen one of these plugs before and didn't know it was special at the time and most likely passed it along But will keep my eyes out , am sure you would want a NOS ! Small Cox Logo
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Post  crankbndr Wed Apr 18, 2018 9:21 am

Its going to be almost imposable to find that head, the one in my photo does not have the little fin.
Since the engine is so valuable maybe you could find a cylinder, piston and head from a Space Bug, I believe the Space Bug had two intake ports also.
At least it would keep the engine authentic.

Also there was a question about the case with no lip and the gasket, a Space bug Jr. would fix that.
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Post  Mark Boesen Wed Apr 18, 2018 10:25 am

I think the flange was added in '54 to the cast case, most Strato Bugs have the early non-flange case.


Last edited by Mark Boesen on Wed Apr 18, 2018 10:43 am; edited 1 time in total
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Post  crankbndr Wed Apr 18, 2018 10:39 am

Cool! Than all it needs is Space Bug parts. I’ll buy that flawed Strato from you! Very Happy
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Post  MauricioB Wed Apr 18, 2018 10:45 am

Hi guys, I was reading the thread and I see the price for what was sold that engine U $ 598.88 !!, it's a lot of money. My question is: is this value generated by the collectors and the demand for something unique? or this engine has something special that reaches that number of values? ... I'm interested in learning from you, thanks.
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Post  Mark Boesen Wed Apr 18, 2018 10:58 am

It's classic 'supply and demand' only made for slightly over one year and the popularity of Strato Bug engine. Likewise the early RR-1 with non-anodized case seems to bring less money then the more common yellow anodized case.
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Post  MauricioB Wed Apr 18, 2018 11:02 am

Mark Boesen wrote:It's classic 'supply and demand' only made for slightly over one year and the popularity of Strato Bug engine. Likewise the early RR-1 with non-anodized case seems to bring less money then the more common yellow anodized case.

Okay, thank you for your response, it's always good to learn and know the why of things.
Congratulations then to whoever has that treasure!
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Post  Cox International Wed Apr 18, 2018 11:11 am

We swapped the head of the Strato Bug from our house collection so that our customer has a complete and authentic engine and the seller is sending us a couple of heads; whereas hopefully one is the correct one.

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