Mr.B. Posted October 27, 2015 Share Posted October 27, 2015 I'm building the Flair 1/4 scale Tiger moth and have a 180 Saito to go at the front. What prop should I start with? The manual states this engine will pull a 18x6 in a scale application. This has the advantage of being pretty much scale size. Any experiance with this engine or thoughts on brand of prop? Thanks Quote Link to comment Share on other sites More sharing options...
Jon H Posted October 27, 2015 Share Posted October 27, 2015 it will rev like mad but try it. I use 20x6 on my Laser 180 in a 1/4 scale stampe but the Laser is a long stroke torque monster. I am not sure how the saito would react. If you run high nitro I wouldn't recommend it Quote Link to comment Share on other sites More sharing options...
Mr.B. Posted October 27, 2015 Author Share Posted October 27, 2015 Thanks Jon. I generaly use 10% nitro fuel. Quote Link to comment Share on other sites More sharing options...
Jon H Posted October 27, 2015 Share Posted October 27, 2015 you should get away with 10%. I never use more than 5 as engines simply don't need it if set correctly. Give a 20x6 a go but keep an ear out for any knocking. Quote Link to comment Share on other sites More sharing options...
Rick Tee Posted October 28, 2015 Share Posted October 28, 2015 According to the engine information here 18x6 should be just fine. I'd go with a wood or a carbon one. Edited By Rick Tee on 28/10/2015 08:45:59 Quote Link to comment Share on other sites More sharing options...
Andy Green Posted October 28, 2015 Share Posted October 28, 2015 I have a 1/4 scale Pup, with a Saito 180. I run a 20*6 prop on 5% ProSynth. The Saito is a bit of a beast, but I have found that converting it to spark (Note: Spark ignition but still on glow fuel) has tamed it for starting, but I'm guessing with a fixed timing position has improved fuel economy too. Andy Quote Link to comment Share on other sites More sharing options...
Andy Meade Posted October 28, 2015 Share Posted October 28, 2015 That's a very neat install Andy. Quite a bit of church roof there too Quote Link to comment Share on other sites More sharing options...
Andy Green Posted October 28, 2015 Share Posted October 28, 2015 Look again Andy - its all stainless no churches were harmed in the making of this model . Its a bracket I had made to bring as much mass forward as I could. Quote Link to comment Share on other sites More sharing options...
Andy Meade Posted October 28, 2015 Share Posted October 28, 2015 Ooh, very nice, I like that Quote Link to comment Share on other sites More sharing options...
Mr.B. Posted October 28, 2015 Author Share Posted October 28, 2015 A very neat installation Andy. So far I have never got the MIG welder out for a model build! The 180 is a beast you say. What should I expect? While a wooden prop would look spiffing my chosen prototype has a grey painted prop. Also I think it would benefit from a bit of fly wheel effect. It will be a while yet before the Tiger takes to the air. Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted November 4, 2015 Share Posted November 4, 2015 Hi Andy . Nice installation , very neat. I would like to point out one thing I have gleaned from experience. Your pup has a large open radial cowling but very little air will flow over the cylinder with that set up and your engine will cook. You will find that the air will take the easy route out and go straight out of the bottom of the cowling leaving the top ,where all the heat is being generated in stagnant or very little air flow. Fit a dummy engine in front of your Saito and leave a slot/opening in front of the your real cylinder preferably with some ducting to guide cool air over the cylinder and through the fins . The air flow through the slot in the cowling will be increased due to the partial vacuum formed by the large exit at the bottom of the cowling . Regards E.D. Quote Link to comment Share on other sites More sharing options...
Andy Green Posted November 4, 2015 Share Posted November 4, 2015 Thanks ED, Its is on the list - as the saying goes a Scale model is never finished, it just gets heavier. Not had a problem with overheating up til now, but just lucky I guess. Andy Quote Link to comment Share on other sites More sharing options...
Tony Richardson Posted November 4, 2015 Share Posted November 4, 2015 Hi Mr B if you are going to stay glow ignition you have made the right choice to stay with a heavy prop, as Andy says the 180 is a bit of a beast and can "bite" when starting it if you are not careful also stay with the 18/6 it is perfect for this motor on glow, if you decide to go spark with glow fuel you will find it an entirely different creature a 20/6 wood prop is fine and hand starting becomes pleasant. I ran my 180 ( before spark conversion ) on Saito/Ys 20/20 fuel ran very well, after converting yo spark fuel was mixed to around 5% nitro 9-10% oil and it ran just fine with no problems also it was far more economical I suspect because there was more actual fuel and less lube and nitro overheating was never a problem even in a fairly tight fitting cowl of the Curtis P6E it was in. you will enjoy this engine once you become accustomed to it. Hi Andy glad to see you changed your 180 to spark very nice install I might add, I eventually swapped mine out for a 4 stroke petrol with a Walbro pumper carb as syphoning was a problem with the Curtis tank position, it was way to high and could not be altered, no issues with the Saito, I am sure I will find something to fit it in Just re read ED's post regarding the overheating issue, my engine was mounted inverted with the head slightly exposed and a small opening in the front of the cowl and a huge opening in the lower rear of the cowl ( purely the design of the model no expertise on my behalf ) so this may be some thing for you to consider during your build. Good luck and enjoy.. Edited By Tony Richardson on 04/11/2015 17:51:44 Quote Link to comment Share on other sites More sharing options...
Mr.B. Posted May 1, 2016 Author Share Posted May 1, 2016 Well the 180 powered tiggy is finished and flown. I went with the 18x6 as per the engine manual. I feel the engine could swing a bigger prop so may experiment. The 180 is real sweety. It starts and idles well. Who knows where I can get a new single sub C cell for the on board glow? Quote Link to comment Share on other sites More sharing options...
Former Member Posted May 1, 2016 Share Posted May 1, 2016 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
onetenor Posted May 1, 2016 Share Posted May 1, 2016 TRY the Component Shop /Store I can't do a link but a Google will find it Quote Link to comment Share on other sites More sharing options...
cymaz Posted May 1, 2016 Share Posted May 1, 2016 Here you go Quote Link to comment Share on other sites More sharing options...
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