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Sep 20, 2019, 11:03 PM
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crawf56's Avatar
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Quote:
Originally Posted by J40
Everything going okay crawf?
Yes, sorry for no posting. I have been meaning to do some engine tests, and have not had a chance.

I am even considering taking a day of vacation to work on some stuff.

Fall is very busy for me. My oldest son plays football at a NCAA D2 college, and my youngest son is in the marching band of a large university. So, I am typically driving 5 hours to see a football game...somewhere.

However, the stars and schedules have aligned. I am open the weekend of Fall Small.
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Sep 23, 2019, 08:44 PM
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All right, a little progress. I was able to test the Killer Bee II engine, and it buzzed pretty good.

Now to sort out spinner options.
Sep 23, 2019, 09:13 PM
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xplaneguy's Avatar
Just two weeks until it's ripping up the SMALL sky!
Sep 28, 2019, 10:00 AM
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Was able to get a test run in on the Killer Bee with the 1-3/4 spinner. When I got everything tightened up good, the engine ran fine.

One of the issues I had to deal with is the bolt that holds the prop and spinner to the engine.

The motor comes with a bolt that is about 3/4 to 7/8 inches long. I also have some longer bolts that are 1-1/4 inches. For this setup, the shorter bolt did not have enough threads to engage the motor, and the long bolt could not tighten down on the prop and spinner.

So, I cut a bolt to 1 inch long, and that worked. I believe this is a 4-40 bolt? 2-56? The bolt was too small for Ace Hardware to have.
Sep 28, 2019, 11:05 AM
------
coriolan's Avatar
Quote:
I believe this is a 4-40 bolt? 2-56?
The prop shaft on all Cox .049/.051 is 5-40:
https://coxengines.ca/cox-049-engine-stud-3.html
Cox .020 is 3-48, and Cox .010: 2-56
Sep 29, 2019, 08:48 PM
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Quote:
Originally Posted by coriolan
The prop shaft on all Cox .049/.051 is 5-40:
https://coxengines.ca/cox-049-engine-stud-3.html
Cox .020 is 3-48, and Cox .010: 2-56
Thank you, sir.
Sep 29, 2019, 11:35 PM
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Got the Killer Bee 049 moved to the Spitfire. Next step is a engine test with the Spitfire.
Sep 29, 2019, 11:39 PM
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The kit is listed as weighing 17 to 19 ounces.

I am getting 16 ounces right now. Looks like I need 2 or 3 more ounces for balance.
Last edited by crawf56; Sep 30, 2019 at 12:07 AM.
Oct 02, 2019, 07:51 PM
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No pics, but I was able to test the fuel tank and motor on the Spitfire. Ran good.

So, Spitfire balanced and motor-tested: ready for a flight! Hopefully this weekend.
Oct 02, 2019, 08:53 PM
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1/2A Nut's Avatar
Best wishes on the Maiden Flight!!!!!
Oct 02, 2019, 09:30 PM
J40
J40
Airplanus Erectus
Good luck crawf! Have fun!
Oct 07, 2019, 11:01 PM
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The good news is that I didn't crash. But I was unable to fly due to engine/fuel tank troubles.
Oct 07, 2019, 11:29 PM
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1/2A Nut's Avatar
Fuel tank is low needs to be more centered to the venturi add some foam under the tank.
Will help with vibrations and get the pickup line inside the tank more level with the venturi
for ease of flow. Pickup needs to be just below the venturi.
Last edited by 1/2A Nut; Oct 07, 2019 at 11:38 PM.
Oct 08, 2019, 10:18 PM
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Quote:
Originally Posted by 1/2A Nut
Fuel tank is low needs to be more centered to the venturi add some foam under the tank.
Will help with vibrations and get the pickup line inside the tank more level with the venturi
for ease of flow. Pickup needs to be just below the venturi.
Yeah, I agree. In defense of Mr. Clutton, I installed the tank lower than recommended. This because I made a SOLID tank cover, rather than a HOLLOW cover recommended by the instructions. See the first pic.

I will be using a flatter tank. Second pic, tank on the left. (It is on it's side; the white tubes are on top.)
Oct 10, 2019, 11:05 PM
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Got everything back together, but no time for a test flight. I will be taking the Spitfire to SMALL, probably not to fly.


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