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Model Forum / Radio Controlled / Air Models / June 2008Engine - Prop Combo...
Hi All, Still working on a Senior Telemaster, and am planning on using an OS-61 for power. After getting the wing mounted on the fuze, I'm wondering if a .61 is big enough? Anyway, my question is how big a prop can I use. Prior plane was a 60 size trainer, and I used a 12x6 prop, and it seemed to work ok. Do you think I can use a 13x5 on this plane/engine combo??? 12 x 6 = 72, and 13 x 5 = 65 so power seems about the same. I'm looking for take-off performance, not top speed. Maybe even a 14x5 if I found one????? Can you go too far with this? Thanks for any input. Ted shuffled out of his cave and grunted these great (and sometimes not so great) words of knowledge: > Hi All, > [quoted text clipped - 8 lines] > > Thanks for any input. The 61 is plenty for this bird - the specs only call for a 45 - 60. You should be OK with the 13x5. 2 things you need to be aware with the prop though: 1. Over revving of the engine. The larger diameter will act as a flywheel to help keep the rpms in line even though the lower pitch will allow the engine to rev up. 2. Ground clearance. You should have a MINIMUM of 1 1/2" (2"+ preferred) between the end of the prop and the ground when the plane is level. A lot will depend on if you are flying off of grass or pavement and how much flex the landing gear has. > Ted shuffled out of his cave and grunted these great (and sometimes not > so great) words of knowledge: [quoted text clipped - 26 lines] > level. A lot will depend on if you are flying off of grass or pavement > and how much flex the landing gear has. Thanks for the input. I'll check the prop clearence when I get the gear installed, shoot for 2 inches. I have use of the taxi way at the airport, so first flight will be from asphalt. May use the main runway if I have no guts that day! I read the specs too, but the thing just seems huge when compared to the 40/60 size I have flown in the past. BTW, I just finished installing the functional wing struts today. AL fittings at the fuze into 1/4 ply, and thru bolted to a main spar, Used faired AL tubing from Tower, flattened a tad at the ends. Attachment fittings slide into the tubes with a pin to lock. Look clean and light, and seem quite strong for tension. If summer ever gets here, it will be a next season plane, but 12 inches of snow yesterday makes me wonder about that Global Warming thing. Rich..... On Jun 11, 8:22 pm, Ted Campanelli <tc...@grumpyoldmen.com> wrote: > Ted shuffled out of his cave and grunted these great (and sometimes not > so great) words of knowledge: [quoted text clipped - 26 lines] > level. A lot will depend on if you are flying off of grass or pavement > and how much flex the landing gear has. Thanks for the input. I'll check the prop clearence when I get the gear installed, shoot for 2 inches. I have use of the taxi way at the airport, so first flight will be from asphalt. May use the main runway if I have no guts that day! I read the specs too, but the thing just seems huge when compared to the 40/60 size I have flown in the past. BTW, I just finished installing the functional wing struts today. AL fittings at the fuze into 1/4 ply, and thru bolted to a main spar, Used faired AL tubing from Tower, flattened a tad at the ends. Attachment fittings slide into the tubes with a pin to lock. Look clean and light, and seem quite strong for tension. If summer ever gets here, it will be a next season plane, but 12 inches of snow yesterday makes me wonder about that Global Warming thing. Rich..... YIKES! I used to fly one with a .60 in it and we used it for a glider launch platform. The difference between 60 sized trainers and this is the wing. Watch those struts like a hawk. I have had AL struts work harden and crack under load. Jim Branaum AMA 1428 61 is plenty for this plane. Your instinct on propeller sizes sounds about right. If I were you I'd procure a few different sizes and try them all. Propping this plane for speed won't do a lot of good because it just doesn't need it, and then it will have trouble landing. In either case it will climb well because it's so light and a 61 can't help but drag the plane around. I don't think you'll go to far wrong in either direction. > Hi All, > [quoted text clipped - 8 lines] > > Thanks for any input. Depends, which OS .61 do you have? Two-stroke? Four-Stroke. Recent manufacture? Old? Which model? Ed Cregger > Hi All, > [quoted text clipped - 8 lines] > > Thanks for any input. > Depends, which OS .61 do you have? Two-stroke? Four-Stroke. Recent > manufacture? Old? Which model? [quoted text clipped - 15 lines] > > - Show quoted text - Ed, It's an OS .61 2 stroke, I got new about 3-4 years ago. Don't remember the model. The LHS did a pretty good turnover of stock, so I suspect it was a current model. It would drag my 60 size trainer vertical with an 11x6 prop, so it seemed to be a pretty strong motor. And I do have 3000 x 75 feet to get it into the air if needed. Rich..... On Jun 12, 10:52 pm, "Ed Cregger" <ecreg...@bellsouff.net> wrote: > Depends, which OS .61 do you have? Two-stroke? Four-Stroke. Recent > manufacture? Old? Which model? [quoted text clipped - 19 lines] > > - Show quoted text - Ed, It's an OS .61 2 stroke, I got new about 3-4 years ago. Don't remember the model. The LHS did a pretty good turnover of stock, so I suspect it was a current model. It would drag my 60 size trainer vertical with an 11x6 prop, so it seemed to be a pretty strong motor. And I do have 3000 x 75 feet to get it into the air if needed. Rich..... ------------- Well, that sounds like an engine that will have plenty of power for your Senior Telemaster. A good friend of mine gave me a flight or two on his Senior Telemaster that was built from a kit. His was powered by an HB .61. I forget if it was the PDP model at the moment. Anyway, he had a bunch of power with that engine. I'm sure that your recent OS .61 is more powerful than that good running HB .61 of Art Shindel. It was off the ground in just a few feet with a light head wind. The rest of the time I flew at half throttle or less and was still able to perform loops, Immelmanns and stall turns with no problem whatsoever. Ed Cregger >Well, that sounds like an engine that will have plenty of power for your >Senior Telemaster. [quoted text clipped - 10 lines] > >Ed Cregger About all I can add to this thread is that the Senior Telemaster with stock landing gear and 4 inch wheels has sufficient ground clearance to swing a 14 inch prop over a grass runway. , so any reasonable prop on a .61 two stroke should be ok. the only problem I have with mine is getting the silly thing to come back down to earth again, Even on a ,91 four stroke with a ridiculously slow idle, it just wants to keep flying. YMMV bob > the only problem I have with mine is getting the silly thing to come back down > to earth again, [quoted text clipped - 3 lines] > YMMV > bob What size propeller do you have on your .91? I used to fly my Senior Telemaster with a Saito 65. I'm currently building a 6 foot Telemaster 40 from the Hobby Lobby plans by Joe Bridi (in case you're familiar with that plan). I'm trying to decide whether to power it with an OS 40 FP or a 52 Surpass. I love 4 strokes, but I'm leaning toward the 40 FP. I won't have to decide for another week at least. I'll probably flip a coin. >What size propeller do you have on your .91? I used to fly my Senior >Telemaster with a Saito 65. OS .91 Surpass II pumped, Red Max 15% fuel, APC 14x6 onboard glow automatic at minimum idle speed 32 ounce fuel tank centered on the fore-aft balance point, rigged for banner tow, rigged for glider tow rigged for glider piggyback WAY more power than it needs, but in the air, and idled back to cruise, it is fun to fly and it looks and sounds "right" to me YMMV bob . >> the only problem I have with mine is getting the silly thing to come back >> down [quoted text clipped - 14 lines] > strokes, but I'm leaning toward the 40 FP. I won't have to decide for > another week at least. I'll probably flip a coin. --------- Robbie, I think I figured out the problem between us. I was confusing you with another fellow that went by the handle of Desmo Bob, but then changed his name to his real name. I thought he and you were the same person. Sorry about that. No offense or aggravation intended. Ed Cregger > Robbie, I think I figured out the problem between us. I was confusing you > with another fellow that went by the handle of Desmo Bob, but then changed > his name to his real name. I thought he and you were the same person. Sorry > about that. No offense or aggravation intended. > > Ed Cregger No problem. |
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