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Parra Tiger T4 Especial 3,2cc Babe_b10
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Parra Tiger T4 Especial 3,2cc Empty

Parra Tiger T4 Especial 3,2cc

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Parra Tiger T4 Especial 3,2cc Empty Parra Tiger T4 Especial 3,2cc

Post  ian1954 on Mon Feb 17, 2020 2:38 pm

T4 and T3 are available in Especial version. These Special engines are selected better fit of bearings to crankshaft. This ensures more smoother running of crankshaft.

Also, the piston is refined by means of grinding and lapped carefully, tested on bench and lapped. It is a close as possible to those parameters that are obtained after running-in. That means the maximum power can be obtained from the engine almost immediately, but it is necessary to have a short running-in period of 15-20 minutes rich mode with a gradual output at maximum speed.

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Post  Ken Cook on Mon Feb 17, 2020 4:54 pm

Very nice Ian, my son and I have been dabbling in diesels again. We had a few flights in 2 weeks ago which went pretty successful. My son mixed the diesel fuel and our fuel worked superior to everyone else's brew. I have a OS FSR .40 which I ran yesterday with a Davis Diesel conversion head. I never had a diesel run like this engine, absolutely perfect in all aspects. The engine has been in a box for close to 40 years, it started on the 4th flip. The .40 is a r/c engine which just outright idled superb, throttle response was good and it was turning a APC 12x6 like it was a .60 glow. Our flights were on a profile plane very similar to a Junior Flitestreak, I was using the Yin Yan Silver Swallow on that plane. That engine was my first introduction to diesels as it was intended for and it actually is a very friendly diesel to use.
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Post  ian1954 on Mon Feb 17, 2020 6:42 pm

The recommended prop for the T4 is a 10x5. You always have to bear in mind that the diesels turn a larger prop when building a model that specifies a glow engine and lengthen the undercarriage,

I am pleased that you have a couple of well sorted diesels and found the right blend of fuel. I don't have a Silver Swallow but there is a good article on them here

https://www.adriansmodelaeroengines.com/catalog/main.php?cat_id=74

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Post  ffkiwi on Wed Apr 15, 2020 4:40 am

The Silver Swallows are very underrated engines-both the 1.47 and 2.47 models....my experience is that the earlier ones are much better built than the later ones. They do suffer from a slightly excessive bore taper-which makes them very hard to start from brand new-but once they get a bit of time on them, they are very reliable-and run extremely steady. The 2.47 does have an occasional reputation for breaking shafts-but they are so cheap (or were -when they were available) that you simply buy another one. that being said I've had a dozen through my hands over a 30 year period-mainly the 2.47-and NONE have broken anything-so part of me suspects that the 'breaking shafts' owes more to inept operation and hamfisted owners than any material or workmanship defects!

Now they are not going to give an Oliver Tiger, a modern PAW 15, a Fora-or a Parra any sleepless nights-but for an engine that I could buy from Hong Kong for the price of a Cox Babe Bee in NZ (at the time!) they represented extraordinary value for money....and considering they first appeared around 1963-they compare more than favourably performance-wise with anything similar on the market at the time...

I still have three 2.47s and two 1.47s in my engine stable...

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