New OS Sirus 7 cylinder radial engine FR7-420 for RC airplanes
Description : 02 Apr, 2023
Express Hobbies is starting to sell our engine collection. We have a number of radial and in-line motors for sale from OS and evolution.
Other motors include a seven cylinder evolution radial OS 5 cylinder, radial OS FF 320 4 cylinder OS FT-320 twin
Responding to creative model enthusiasts with high quality stable products has been our unchanging policy. FR7-420, its pet name “Sirius 7”, 4-stroke 7-cylinder glow engine is a new symbol of O.S. carefully designed down to detail, not only for exterior appearance but also for mechanical performance and realistic exhaust sound. We are quite confident that FR7-420 will win modelers’ trust and satisfy them.
Since 1986, O.S. owners have enjoyed the unique experience of owning and operating the fabulous FR5-300 Sirius 5 cylinder radial. Models have e bigger over the years and O.S. wanted to release a new radial engine to cater for that market. The result is the gorgeous FR7-420. With 7 cylinders and a capacity increase to nearly 70cc, the FR7-420 offers a dramatic increase in both torque and power. In keeping with the scale image set by the Sirius, the new FR7-420 has been styled in the same way with front pushrods and separate rocker boxes for the inlet and exhaust valves. These totally new cylinder heads are not just about ‘style’, they offer a more efficient design that contributes to the power output. That neat frontal appearance is maintained by keeping the single, dual needle carburettor at the back and hidden in the centre of the engine mount. The prototype engine shown here will have some detail changes (cast cylinder heads etc) made before release, but the general style will be similar. It would almost be a crime to hide it away in a cowling!
At Express Hobbies, we pride ourselves on being one of the most fully stocked sources of hobby merchandise in Canada with well over 100 years bined hobby experience. If you can't find it here, give us a call! We pride ourselves on being one of the highest quality hobby shops in all of Canada and we source products for all of your hobby needs from astronomy, science, plastics models, die-cast, remote controlled trucks, rc cars, rc airplanes, model trains and rocketry. Check us out at Or visit us in person in Saskatoon @ 411 34th Street East Saskatoon SK. We are open 10AM-6PM Monday-Friday and 10AM-5PM on Saturdays. We e phone calls and emails with your questions and can ship most products within Canada. Please call 306-954-3434 or email us at info@. We post regularly on Facebook and Instagram with new arrivals and specials. Please Check our in-store inventory on our pointy page with over 8000 items in stock. Cut and past the link below
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