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What's the attraction of diesel plane engines?

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Old 05-15-2018, 04:04 PM
  #51  
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If FOX had sold engines finished like that they would still be in business selling them. Well done. How does she run on diesel?
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Old 05-16-2018, 12:30 PM
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Originally Posted by fiery View Post
If FOX had sold engines finished like that they would still be in business selling them. Well done. How does she run on diesel?
Thanks. I have not run this .74 as a diesel, but did have a Fox .74 with Davis head in the past. It ran quite well. Big prop spinning ability and good idle.
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Old 05-24-2018, 03:53 PM
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Originally Posted by RichardGee View Post
Model diesels (compression ignition) are fun to play with. It never ceases to fascinate me that an engine can run without a spark or glow plug. Unlike many, I actually like the smell of the exhaust, although I agree that it permeates EVERYTHING and you will want to wear clothes you do not care about and rags you intend to throw away. That said, my flying experience with model diesels, both made for diesel (PAW and MVVS) and Davis conversions, is that other than fuel economy they do absolutely nothing better than a glow engine. And the improved fuel economy has far more to do with lower RPMs than it does the theory that Kerosene possesses greater BTU potential than Methanol. I too like being able to "adjust the timing" with compression, which allows ridiculously large propellers at lower RPMs, but have enjoyed my model diesels FAR more on the bench, than in the air.
I must relate this I had a glow engine in my hand - no tank, no glow lighter but had just cleaned it up with WD 40 and an old rag. Out of habit I flipped the prop and it fired and ran for just a second on just the WD - be careful out there!
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Old 05-24-2018, 04:03 PM
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Originally Posted by gmeyers View Post
I must relate this I had a glow engine in my hand - no tank, no glow lighter but had just cleaned it up with WD 40 and an old rag. Out of habit I flipped the prop and it fired and ran for just a second on just the WD - be careful out there!
Various people have reported over the years the experience of filling a glow engine tank with diesel fuel, flicking and it starting and running.
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Old 08-12-2018, 09:50 PM
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Originally Posted by H5487 View Post
Please don't shoot me for asking but I don't understand the attraction of diesel engines in model airplanes. What am I missing?

Thanks,

Harvey
Perhaps its the extra twiddle screw on top that makes them seems worthy of male attention, that and they have always seemed to be heavier than their glow equivalent and again, feel more ..............manly.
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Old 08-15-2018, 04:15 PM
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I think the main attraction for Aussie blokes from the Baby Boomer gen the attraction is the nostalgia of it all. as most of us seemed to start on diesel engines. Being then a nation that had strong trading links to GB it was harder to get glow engines and glow fuel (particularly nitro) was equally rare.
So many of us started with a Taipan diesel in a Taipan Trainer.
The smell of diesel fuel, so much of a turn off to the feminine nose, has a strong attraction for us.
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Old 08-16-2018, 02:59 AM
  #57  
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Ultimately, it reminds me of my childhood. My dad used to take my sister and I to the local large commercial airport (MSP) on Saturday mornings and watch lanes take off all morning. The smell of model Diesels running is similar to the smell of burning JetA and it really brings me back.
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Old 08-27-2018, 12:43 AM
  #58  
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In regards to ringed pistons not working well as diesels, I wonder if a purpose built modern ringed engine might actually work rather well.
For those who know a bloke called Lauri Malilla, he makes his own ringed control line stunt engines and has mentioned that most production ring setups are woeful.
Get the bore perfectly round, a correctly gapped well fitting ring and most might be pleasantly surprised as to how well they can seal.
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Old 08-27-2018, 02:51 AM
  #59  
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Originally Posted by Chris W View Post
In regards to ringed pistons not working well as diesels, I wonder if a purpose built modern ringed engine might actually work rather well.
For those who know a bloke called Lauri Malilla, he makes his own ringed control line stunt engines and has mentioned that most production ring setups are woeful.
Get the bore perfectly round, a correctly gapped well fitting ring and most might be pleasantly surprised as to how well they can seal.
It's not just the seal though that is vital to a compression ignition engine -- I've been running and flying diesels since the mid 1950's and have never owned a ringed diesel. Seems the manufacturers shy away from piston rings maybe for good reasons .
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Old 08-29-2018, 07:38 PM
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Default Ringed Diesels

Ringed Kraft .61.

It has so much compression it is difficult to turn over with an electric starter suitable for up to 1.20 glows.

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Old 08-30-2018, 08:56 AM
  #61  
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Originally Posted by fiery View Post
If FOX had sold engines finished like that they would still be in business selling them. Well done. How does she run on diesel?
Not so - Fox owner Duke Fox was not around for many years and family did not do the research and development that Duke did. The Fox heyday was during the peak of the control line era when they produced and sold more engines than any other company. When RC began to dominate the OS,engines, and others took control of the model engine markets. During the early years of RC Fox began a decline they would never recover from - due in part to lack of an effective muffler and inadequate carburetor. The addition of an aftermarket diesel cylinder head to a Fox engine (especially an Eagle .60) made for a real powerhouse.
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Old 08-30-2018, 05:14 PM
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Originally Posted by gmeyers View Post
Not so - Fox owner Duke Fox was not around for many years and family did not do the research and development that Duke did. The Fox heyday was during the peak of the control line era when they produced and sold more engines than any other company. When RC began to dominate the OS,engines, and others took control of the model engine markets. During the early years of RC Fox began a decline they would never recover from - due in part to lack of an effective muffler and inadequate carburetor. The addition of an aftermarket diesel cylinder head to a Fox engine (especially an Eagle .60) made for a real powerhouse.
The deep dark secret that many people won't accept was that the Duke spent some time in jail.
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Old 09-02-2018, 12:44 PM
  #63  
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Duke Fox never spent any time in jail, that was a hoax, there is not one shred of evidence that that or any thing else happened. This has been clarified on these pages several time over the years. The owners and higher ups of this site conducted their own investigation about 15 years ago so we could say that with surety.
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Old 09-02-2018, 12:53 PM
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Richard, here is a ring Fox .74 turning a Graupner 12 x 8 three blade at 9,300 rpm on Davis ABC blend. With the Fox EZ Just carb it turned about 9,450. Interestingly, I had a Graupner 12.5 x 7 that turned 900 less rpm, it's blades were about 1/8th" wider.


Bisson 60 size muffler adapted to the Fox 74, note opposed baffles, it had deep throb sound but not at all loud.
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Old 09-02-2018, 01:25 PM
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Originally Posted by Hobbsy View Post
Duke Fox never spent any time in jail, that was a hoax, there is not one shred of evidence that that or any thing else happened. This has been clarified on these pages several time over the years. The owners and higher ups of this site conducted their own investigation about 15 years ago so we could say that with surety.
Rubbish !
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Old 09-02-2018, 02:06 PM
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Originally Posted by qazimoto View Post
The deep dark secret that many people won't accept was that the Duke spent some time in jail.
I used to be a truck driver and on occasions would pass through Fort Smith Arkansas and stop by the Fox factory - later when I had a chance I would fly down there in a borrowed plane and Betty Fox would have one of her workers pick me up at the airport and I would spend the afternoon at the factory sometimes I would have lunch with her. It is not a myth regarding Duke Fox .
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Old 09-02-2018, 03:24 PM
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The Duke of Fort Smith; A Few Comments About Him And His Fox Twin 1.2 R/C Engine (Janson review)
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Old 09-02-2018, 04:52 PM
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And Derek, that is the only mention of it, there are no police records of it, no court records of it. no news paper articles.
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Old 09-02-2018, 05:16 PM
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I will accept that Dave. I don't make it my business to be concerned with the personal affairs of others. It is just that Mr Janson's article appears to be the source of the comment and as far as I know has never been repudiated.

So, we should now move back to discussing the joy of using diesel engines. Here is my lovely final FOX .15 BB Schnuerle R/C with Davis Diesel head.


Last edited by fiery; 09-02-2018 at 05:31 PM.
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Old 09-02-2018, 05:18 PM
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Originally Posted by Hobbsy View Post
And Derek, that is the only mention of it, there are no police records of it, no court records of it. no news paper articles.
There's no mention available on the internet. That's all that means. I understand that it wasn't just for pornography either. You're discounting Mr Meyers statement? Notice that the MEN article was written by a prominent US SAM member. My information came from a club member who hosted both George Aldrich and Bob Palmer in their visits to Australia. It's all dead and buried now. Except that Betty Foxe's contribution to the continuing success of the enterprise deserves to be noted.

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Old 09-03-2018, 01:40 AM
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LA .10, my smallest Diesel
Prominence is not an indicator of the quality of the man, I'm just keeping the record straight, no evidence equals no case, no guilt and hearsay does not count.

Derek, I talked to Diesel Dan/AMB yesterday, he's 85 now and doing well health wise, he hasn't run a Diesel or flown a plane for a couple of years. I try to keep in touch with our old Diesel friends.

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Old 09-03-2018, 02:33 AM
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Originally Posted by fiery View Post
If FOX had sold engines finished like that they would still be in business selling them. Well done. How does she run on diesel?


They can be prettied up some, this is a new 50.

Last edited by Hobbsy; 09-03-2018 at 02:34 AM. Reason: Spelling
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Old 09-03-2018, 06:03 AM
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Originally Posted by Hobbsy View Post

Richard, here is a ring Fox .74 turning a Graupner 12 x 8 three blade at 9,300 rpm on Davis ABC blend. With the Fox EZ Just carb it turned about 9,450. Interestingly, I had a Graupner 12.5 x 7 that turned 900 less rpm, it's blades were about 1/8th" wider.


Bisson 60 size muffler adapted to the Fox 74, note opposed baffles, it had deep throb sound but not at all loud.
Have you found a source for diesel fuel or are you mixing your own?
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Old 09-03-2018, 04:55 PM
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Thanks for letting me Dave. I noticed AMB has not been active on the forum for a few years. Glad to hear he is still with us.
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Old 09-04-2018, 02:38 AM
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I'm down to about 3 gallons of Mr. Davis' fuel. I've tried mixing my own but it never ran as well as Mr. Davis' fuel.

Last edited by Hobbsy; 09-04-2018 at 05:24 PM.
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