Quote from: Motorman on August 24, 2023, 03:11:52 PM
That's good but they fly Vintage combat on .016" last I knew. I suggested they go to .018" for increased safety but apparently I'm stupid.

MM

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All of the Vintage or Nostalgia Combat events I have been to in TX and AZ were flown on .018". Even "speed Limit" (#329 slow) combat is flown on .018" x 60'
If they're flying on .015" lines it just makes it less safe and makes their "speed" claims less legit

Well, Why, bring Vintage Combat into your discussion.

Our Vintage Combat days are not matches and we don't fly matches on .015 lines. Our speed runs were to replicate the days when Combat was flown on .015 lines that's why we do it. Everyone who comes can fly on .018's no one will stop you. I even calculated our model weights to speed as the speed flyers use. We are within the parameters of 80% of breaking strength for 1 line as required for speed. Basically, our cutoff engines are the G21-35 and the 36X BB, Not the Baldie, no mark 3-7's, no nelsons.
  This is really getting old. WE are just having fun flying the old stuff as back in the day. We have yet to have a line break or a fly away and 2023 will be our 10th year. We are not making false claims, put your money where your mouth is.

No disrespect: I do find it comical the argument on the double bubble; who, when & why... specially since double bubbles existed, not innovative and used in speed, carrier & stunt long before the late 70's.

It's all good... :-)

    And correct you are. Double bubble head inserts were around years before I started making them for the Fox MKIII's and IV's. I made some for the early Rossi .15's ( 10.5 MM rear bearing engines ) for my Scale Racers before I started working on one that would work on the Fox's. I'm not trying to take any credit for "inventing the wheel" on this because I did not. I knew that it worked on other engines and after much trial and error ( and making A LOT of different kinds of inserts! ) I hit on one for the MKIII's and MKIV's that worked for me ( and for a lot of other people, also ). Just wanted to make something better than what Duke was selling with these engines. And it was.

                      Dick Tyndall

How are people finding the performance of the head buttons? (not trying to re-start the fire).

Do people still want buttons done with the Nelson chamber? I'm going to do another run of ST35 peri port this year and can add the Fox 36 CS buttons in with that run.

Brian

Hate to burst anyones bubble but the double bubble is an inferior design. If you happen to need a very large combustion chamber for some reason, there is a proper way to do a double bubble but, the ones pistured here are not even good for that. Better than Fox heads yes, I agree.

Quote from: Motorman on January 29, 2024, 02:47:40 PM
Hate to burst anyones bubble but the double bubble is an inferior design. If you happen to need a very large combustion chamber for some reason, there is a proper way to do a double bubble but, the ones pistured here are not even good for that. Better than Fox heads yes, I agree.

Please feel free to call Henry Nelson up and tell him his head design is inferior. I am sure that he, as well as the rest of us who actually know something about engines will be amazed by your prowess in engine design.

    Thank you, I will send you the Nelson head if you need it.
Thanks Al
[/quote]
    Nelson head is on its way.
Thanks Al

Thanks Al,

You did send it to my new address? 115 Daintree Drive...........


Brian

Quote from: Al Ferraro on February 02, 2024, 06:09:05 PM
    Thank you, I will send you the Nelson head if you need it.
Thanks Al

    Nelson head is on its way.
Thanks Al

You did send it to my new address? 115 Daintree Drive...........


Brian
[/quote]
  Yes, Tracking says it it departed a transfer airport in Kingsford Smith, Sydney Australia on Feb. 8 at 8:13 am. The item is currently in transit to the destination.
Al

OK, excellent Al.

Quote from: Al Ferraro on February 10, 2024, 09:53:42 PM
You did send it to my new address? 115 Daintree Drive...........


Brian

  Yes, Tracking says it it departed a transfer airport in Kingsford Smith, Sydney Australia on Feb. 8 at 8:13 am. The item is currently in transit to the destination.
Al

Sample Nelson head received. I'll try schedule this in as soon as I can.

Brian

Quote from: Brian Gardner on February 12, 2024, 10:17:21 PM
Sample Nelson head received. I'll try schedule this in as soon as I can.

Brian

  Thanks Brian.
Al

I have the Nelson chambered head buttons ready for these.

I'll start contacting everyone on the waiting list.

I made more than required. So there's plenty of extras.

Quote from: Brian Gardner on September 30, 2024, 04:15:17 PM
I have the Nelson chambered head buttons ready for these.

I'll start contacting everyone on the waiting list.

I made more than required. So there's plenty of extras.

Payment sent. There will be some really strong Foxes to deal with! 
Al

Nelson chambered buttons all sold out now.

I'd be interested in feedback

Quote from: Brian Gardner on October 08, 2024, 09:28:05 PMNelson chambered buttons all sold out now.

I'd be interested in feedback

I finally got around to install the Gardner MK4 piston and liner set in my tired MK4. I first used the Tindal Nelson plug head with the new Gardner set. The head to piston clearance at TDC was .030 with no head gasket. I assembled the engine and checked it for leaks, and all was good, so I went on to start the break in. For fuel I used Power Master GMA 10% Nitro 22% oil and an APC 8x7 prop. The engine was very hard to start and was difficult to say running and would only turn about 8000 RPMs. So next I checked out the Gardner Nelson Chamber plug head which has much smaller camber then the Tindal head, and it too had .030 clearance at TDC. I decided to cut the head on a lathe to sink the head to .017 at TDC with a .006 head shim. I proceeded with the break in with the same fuel and plug and the engine started right up. My Mk4 was turning the APC 8X7 17800 RPM, and this is with a suction restrictor in the venturi. I then put APC 8X6 on the MK4 to test fly the engine in the air on my fat wing combat plane. The engine ran great and I clocked it at 104 MPH and this is with the suction restrictor in the venturi. The engine sounded great in the turns without a hint of sagging with great fuel milage. I'm very happy with Brians parts, the engine feels great just flipping the prop and holds compression without leaking down when you load it. I might lower the head down to the same as the Nelson .36 engine at.010TDC and take out the restrictor to see what kind of numbers I can get, but as of right now my Mk4 is a great runner and I wanted to thank Brain for his high-quality parts.
Al

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