|
Question about 4-strokes
I posted yesterday about a second plane and due to the response and what club members told me, I ordered the Sig Four Star 40. I'm interested in powering it with a 4-stroke. What's the appropriate size.....I'm guessing the .52. Are there any 4-stroke engines I should keep away from? I'm thinking about the OS just cause I've always liked their products.....what do you think? Thanks in advance
|
RE: Question about 4-strokes
a 52 to 56 is about right for a 40... I do however know that some people put 70's on 40 size, but i don't think you need that.
|
RE: Question about 4-strokes
ORIGINAL: dsk I posted yesterday about a second plane and due to the response and what club members told me, I ordered the Sig Four Star 40. I'm interested in powering it with a 4-stroke. What's the appropriate size.....I'm guessing the .52. Are there any 4-stroke engines I should keep away from? I'm thinking about the OS just cause I've always liked their products.....what do you think? Thanks in advance It took a little getting used to going from a screamin' 2-stroke to the 4-stroke but block out the sound for a little while and just watch the plane and it all comes clear. |
RE: Question about 4-strokes
Dsk,
An OS 52 Surpass 4-stroke would be a great motor for your 4*40. The great thing about a 4-stroke is that it's got a bit more "omph". You can swing a bit larger prop which will give you a little more power. Plus 4-strokes use less fuel than a 2-stroke. You won't get all out screaming speed, but since this is your second plane you probably don't need that anyway. I've got an OS 52 4-stroke on my GP Slow Poke 40 and I love it. I think you're making a great choice here. Hope this helps Ken |
RE: Question about 4-strokes
Thanks Ken, I couldn't for the life of me remember the OS 50 size 4-stroke DOH...
|
RE: Question about 4-strokes
Hey, thanks for the responses......another related question......I have about 5 different OS engines, ranging from .15 up to a .46AX....
In my old control line days, I always used Cool Power 15% and when I started getting into RC, the hobby shop guy said that 10% would work just fine. Well, it has.....in my budding career, I haven't had any engine problems....If I purchase the OS .52 4 -stroke, will the 10% be a good choice for fuel? Any fuel considerations for breaking the engine in? Thanks again |
RE: Question about 4-strokes
DSK,
the 10 percent will be fine with that engine. Just make sure the oil content is 18% or better. Personally I use 15/20 in my OS engines both 2 and 4 stroke The oil I found that seems best is a blend of synthetic and castor and the Byrons fuels are all that way in the 10 to 15 percent nitro ranges (non-helicopter fuel) |
RE: Question about 4-strokes
The 4* is a great second plane. Years ago I built a 4*60 and put a YS .91FZ on the front spinning a APC 15x6. This motor is supercharged and has the power of a 1.20 4-stroke. It will hover, torque roll, flat spin (true flat spin), fly inverted, do blenders and does the best knife edges for the type of plane it is.
If you are a scale flyer, the a 52 or 56 4-strk would work and work fine, but if you like to 3D some, then I recommend a OS 70, Saito 72, 82 and even a YS 63. Tons of power in any of those motors and you will really love the plane more. Having extra power doesn't hurt and plus you don't have to fly at full throttle. My 60 size with a .91FZ is a perfect combo. For me atleast. I still enjoy flying the plane years after building it. I did add a few mods to my 4*60 such as counter balance rudder, pull-pull rudder, dual elevator servos, 1" addition to the control surfaces, bomb drop door in the front plus a few other changes. See it here under the RC aircraft section: http://derrick.myphotoalbum.com |
RE: Question about 4-strokes
ORIGINAL: DTB The 4* is a great second plane. Years ago I built a 4*60 and put a YS .91FZ on the front spinning a APC 15x6. This motor is supercharged and has the power of a 1.20 4-stroke. It will hover, torque roll, flat spin (true flat spin), fly inverted, do blenders and does the best knife edges for the type of plane it is. If you are a scale flyer, the a 52 or 56 4-strk would work and work fine, but if you like to 3D some, then I recommend a OS 70, Saito 72, 82 and even a YS 63. Tons of power in any of those motors and you will really love the plane more. Having extra power doesn't hurt and plus you don't have to fly at full throttle. My 60 size with a .91FZ is a perfect combo. For me atleast. I still enjoy flying the plane years after building it. I did add a few mods to my 4*60 such as counter balance rudder, pull-pull rudder, dual elevator servos, 1" addition to the control surfaces, bomb drop door in the front plus a few other changes. See it here under the RC aircraft section: http://derrick.myphotoalbum.com Feed it high nitor contents and holy crap become OH MY GOD. That had to have been a phenominal mix. Heck I'll screw in my YS110 to my 4*60. The thing hauls my 11lb funtana around nicely, In the 4*60 I'd have a missle with big wings |
RE: Question about 4-strokes
ORIGINAL: bubbagates ORIGINAL: DTB The 4* is a great second plane. Years ago I built a 4*60 and put a YS .91FZ on the front spinning a APC 15x6. This motor is supercharged and has the power of a 1.20 4-stroke. It will hover, torque roll, flat spin (true flat spin), fly inverted, do blenders and does the best knife edges for the type of plane it is. If you are a scale flyer, the a 52 or 56 4-strk would work and work fine, but if you like to 3D some, then I recommend a OS 70, Saito 72, 82 and even a YS 63. Tons of power in any of those motors and you will really love the plane more. Having extra power doesn't hurt and plus you don't have to fly at full throttle. My 60 size with a .91FZ is a perfect combo. For me atleast. I still enjoy flying the plane years after building it. I did add a few mods to my 4*60 such as counter balance rudder, pull-pull rudder, dual elevator servos, 1" addition to the control surfaces, bomb drop door in the front plus a few other changes. See it here under the RC aircraft section: http://derrick.myphotoalbum.com Feed it high nitor contents and holy crap become OH MY GOD. That had to have been a phenominal mix. Heck I'll screw in my YS110 to my 4*60. The thing hauls my 11lb funtana around nicely, In the 4*60 I'd have a missle with big wings My FT90 only weighs 8.62 lbs (dry) with a YS 1.10FZ. Think about how your 11 lbs FT90 flys and take off a couple of pounds and keep the same power plant using 30% nitro. Simply amazing in flight. Does everything under the sun. The 4* with good power is a blast too. |
| All times are GMT -8. The time now is 02:34 AM. |
Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.