i motori e le loro storie

[DavidBurke]

Originalmente inviato da nernst

@ Dooling
Grazie Dooling per il contributo tutt'altro che modesto! Conoscevo gli articoli relativi al Dooling 61 e al G 24, ma non quello sul McCoy. Naturalmente negli anni successivi il quadro cambia sostanzialmente, con l'affermazione di una nuova generazione di motori come il Rossi 60 Speed, il G 60 RV, e dopo ancora inizia l'era dei motori dotati di travasi Schnuerle, OPS, Picco, Rossi....Il primato torna in Italia, anche se ricordo il prototipo del TWA 60 (o 65) di Theobald e Wisniewski, che forse fu il primo motore "grosso" con travasi Schnuerle e pipa. Quando vidi la foto su una rivista americana del tempo mi sembrò un mostro.... bellissimo, con una espressione di potenza non comune. Altri tempi. Sarebbe bello mettere insieme questi gioielli del passato, e provarli, magari solo al banco, fare confronti, scambiare idee. Al momento io ho solo il G 24 e il McCoy 60, chissà, poco a poco....
Ciao
Ernesto

@David Burke
Thank you David for your interest in my questions. I see that you agree with me about the relationship between short stroke and propeller problems. I like your F2A engine project from bar stock, fine!
All the best
Ernesto

Thank you for your comments Ernesto, I include scans of Carl Dodge's barstock engine that was used to win the 1990 World Champs at 302 kph. You will notice the way the transfers are swept back to accelerate the gasses into the cylinder. One Exhaust, two Transfer and two Boost ports, ABC with rear disc induction.

I agree with you about the need to test these old engines like the Dooling 61, G24 etc. I am just begining to make a TestBench that will record Torque and RPM as there is a need to try some of these things out. I will let you know how things go later. I could send you some bits so you can make yours ( Gratis ) later if all goes well. Do you have equipment and machining skills or someone who has?

Would like to also know how the original OPS 60 with ring compared to the same engine with ABC. David Leigh ( the boat modeller ) used the original OPS 60 but with Redhead Piston and Liner to do 299 on 28 thou monoline in 1974 here in Adelaide ( 10*10 prop on 3:1 fuel with full length tuned pipe on suction ).

Greetings to ALL from sunny Adelaide, South Australia.

[pieromuzio]

Originalmente inviato da DavidBurke

Thank you for your comments Ernesto, I include scans of Carl Dodge's barstock engine that was used to win the 1990 World Champs at 302 kph. You will notice the way the transfers are swept back to accelerate the gasses into the cylinder. One Exhaust, two Transfer and two Boost ports, ABC with rear disc induction.

I agree with you about the need to test these old engines like the Dooling 61, G24 etc. I am just begining to make a TestBench that will record Torque and RPM as there is a need to try some of these things out. I will let you know how things go later. I could send you some bits so you can make yours ( Gratis ) later if all goes well. Do you have equipment and machining skills or someone who has?

Would like to also know how the original OPS 60 with ring compared to the same engine with ABC. David Leigh ( the boat modeller ) used the original OPS 60 but with Redhead Piston and Liner to do 299 on 28 thou monoline in 1974 here in Adelaide ( 10*10 prop on 3:1 fuel with full length tuned pipe on suction ).

Greetings to ALL from sunny Adelaide, South Australia.

David,
....
Carl later said Bill Hughes " too much work " and started to use the Profi . That hand made engines are fine but so expensive ......
He was the fastest US in team selection for the next W.C in Bulgaria in August, do you go there ?

I had a long relationship with David Leigh. He won so many Aus. Champs for us with 3,5 , 6,5, 10 and 15cc for many many years ! He was with all family in Milano - Idroscalo for the Worlds Championship in the first '80 years and he and his young son won also. He told me about the UC Speed competitions with OPS !

I think peoples understand us so I will non translate, sorry!

Regards. Piero Muzio FAI 241

[DavidBurke]

Thank you Piero, yes Carl Dodge uses a Profi 2005 with his own bits inside now. I agree his engines are too much work, I will make mine a lot less pretty! I really admire the Lerner engine though, really nice! I also like the work of the Late Wayne Trivan.

Half A Engine

Cannot go to the WC, I still have to work for a living. This is a problem, the Earth is too big!

I see you have talked about propellers letting go, we had that happen in a test bench. Flew straight past my right ear as I was adjusting the fuel needle. Your engine ( OPS Redhead 60 on pipe ) turned into a wild animal as one blade stayed attached, went relly well in the model after that. Perhaps I am giving away performance secrets.

[dooling]

Semplicemente "stupendo".....



molto bene rifinito, senza l'accrocco delle puntine, con un notevole travaso..

[nernst]

Decisamente stupendo, Dooling. Io ne ho uno S/N 16055, che un amico di mio padre ci spedì dagli Stati Uniti verso il 1959, ricordo ancora ( avevo 8 anni ) quando mio padre lo portò a casa. E' nel suo scatolo originale di plastica, completo di istruzioni e decals, ha girato al banco non più di 10 minuti. Un piccolo cruccio, non tanto piccolo in realtà: diversi anni fa volevo smontare i tappi carter, le viti erano dure e il giravite forse non del tutto adatto, le viti si sono mollate, però se ne sono sberciate 6. Sarei felice se potessi trovarle originali, hai qualche idea?
Ciao
Ernesto

[DavidBurke]

Originalmente inviato da dooling

Semplicemente "stupendo".....



molto bene rifinito, senza l'accrocco delle puntine, con un notevole travaso..

@Dooling
Beautiful engine the Dooling 29! Amazingly good castings and machining for the period. The Dooling Brothers built other protoypes which I have seen in a Collector's magazine. Anyone else seen this magazine? I gave my copy away many years ago sadly. Thank you Dooling, it brought back many good memories. Not very powerful though, I think the .29 made about 0.6 BHP @ 18000 rpm?

@Ernesto
Yes, I was thinking of two aluminium plates about 100mm square and 16mm thick with a 25mm steel bar passing through. The rear plate would have the Torque sensor ( Strain Guages ) and you could just attach it to a cheap Voltmeter plus 9 volt battery. Calibration would be by weights on the day of use. I can make two sets and send you one set gratis? You would then need to make a steel stand with a thick steel plate to bolt the plates on. Rough but simple without much to go wrong! I will draw something up for your comment. This will be the so called "propeller" style which is easier on the valuable engines than the Eddy Current type. You will need to try at least five propellers and then use a "Spline Curve Function" in a Spreadsheet to interpolate a power curve, but I can set that up using "Libre Office" and then send you a copy to play with.

Also I will find a photo of the internals of the HS-15 so you can see the differences between it and the Dodge engine.

If all goes well I will scan the three articles by David Guirke ( American ) on using a Dyno and post the link somewhere for others to download.

@Piero
I have got a Norvel 15 Piston and Liner to look at. This is a Russian inovation that uses anodized aluminium fined/liner Teflon coated with a hard nickel plated aluminium piston. I was proposing to replace the piston with something made in bronze ( chrome plated ). Should be good for 45,000 rpm and around 2.75 BHP? I will overcome the weight penalty by using the FMV style piston with plenty of extra holes as well ( air weighs less than metal! ).

29C in Adelaide today with plenty of blue sky!

[pieromuzio]

Originalmente inviato da dooling

Semplicemente "stupendo".....



molto bene rifinito, senza l'accrocco delle puntine, con un notevole travaso..

Dooling,

per mille ragioni strane non l'ho mai posseduto ma ancora oggi a mio parere credo che sia il più bel motore , come i cavalli di "razza" , che sia mai stato costruito ! Elegante, costruito come il 61 in modo magnifico ed il più potente al tempo della sua uscita.

Saluti Piero Muzio FAI 241

[pieromuzio]

David,

you open so many discussions......

About the Norvel liner , here in the first discussion "elaboriamo i motori a scoppio" or "model engines modification" I spoke about all the types of liner- cyl-piston ABC - AAC... and many other material ( your translator will work ... ) for piston and cylinder.

But now I need to go to sleep 2:52 AM ! Milano to day rain and 10° C

Sincerely Piero Muzio FAI 241

[DavidBurke]

Thank you Piero, I will look there for your comments on piston/cylinder materials. For the interest of others I attach the HS-15 which is the current FAI World Record holder.

I have a copy of the article on the "Carter 29" which was derived from the Dooling 29 if anyone is interested. This was used by Ray "Gadget" Gibbs to set the World Record back in the 1950's.

[nernst]

Thank you for your comments Ernesto, I include scans of Carl Dodge's barstock engine that was used to win the 1990 World Champs at 302 kph. You will notice the way the transfers are swept back to accelerate the gasses into the cylinder. One Exhaust, two Transfer and two Boost ports, ABC with rear disc induction.

I agree with you about the need to test these old engines like the Dooling 61, G24 etc. I am just begining to make a TestBench that will record Torque and RPM as there is a need to try some of these things out. I will let you know how things go later. I could send you some bits so you can make yours ( Gratis ) later if all goes well. Do you have equipment and machining skills or someone who has?

Would like to also know how the original OPS 60 with ring compared to the same engine with ABC. David Leigh ( the boat modeller ) used the original OPS 60 but with Redhead Piston and Liner to do 299 on 28 thou monoline in 1974 here in Adelaide ( 10*10 prop on 3:1 fuel with full length tuned pipe on suction ).

Greetings to ALL from sunny Adelaide, South Australia.

Hi David,the Dodge's engine is very interesting, I had never seen this sort of transfers. It seems modified Schnuerle, with two Boost.

I do have some equipment, I'd like a TestBench, unfortunately I don't have milling machine, but maybe a friend can help me. Many thanks.

All the best from Sicily, South Italy!
Ernesto