ok just want to know why everyone seems to be putting larger motors in models than the specified size?????
heaps of these forums are filled with people that put 60 sizes in planes that are designed for 46's... wouldnt the builders/makers of these models try the model out with specific sizes and report what motors wont cause the planes to rip themselves apart in the sky ?????

Dont understand the reasoning help !!!!



Anthony

Sorry, it's just human nature. Everybody wants to be faster or more powerful than the next person. Plus, it's nice to have some reserved power to get one out of trouble. One doesn't need to fly at full throttle all the time.

Let's see...

1. Because of the desire for unlimited vertical performance.

2. Because that's the only motor the builder has that's remotely suitable for the project.

3. Because, with experience, a modeler knows what an airframe can and cannot handle.

4. Because there is a throttle.

5. Because it helps the balance.

6. Because they want to.

7. Because they know that most import manufacturers are VERY conservative for legal reasons.

8. Because they saw it fly as the manufacturer recommended and it was a total dog.

9. Because overpowered is fun.

10. Because its Thursday.

11. Because they only live once.

12. Because they want to see what happens.

...more?


Forgot to mention...I have a Kyosho Giles-202 .60 that is getting assmebled right now with a YS91 on the nose. It won't rip off the firewall. I'm sure airplane will follow the motor/firewall around. Think about that for a minute!!! Perhaps if I anchored the tail and let it blast at full throttle for a few hours it may loosen up, but in my application, the motor, firewall, and airplane are all going to be moving together as a group. For my reasons, refer to the following: 1, 2, 3, 4, 6, 9, 10

Mark

HAHAHAHHAHAHAHA yeah ok .... well done ok
but seriously... if i was to buy a 61 for a 50 size craft is there more of a chance of ....say ripping the wings off with the extra power ?????? or will the (just bought) 52 be ample for the craft ?

13. Because they never learned how to fly on the wing.

14. Because they think it's cool to have a plane takeoff in 5 feet.

15. Because they never learned how to control a plane on a takeoff roll so they need #14.

16. Because they have too much spare money.

17. Male ego, mine needs to be bigger, faster, and badder than yours.

18. Because in spite of the negative connotations of some of the the above reasons, IT'S FUN!

Man I'm with you FrogT. I don't get it either. I have never seen a plane that was built correctly not fly well with the rated motor. Now of course, if you have a sleak pattern ship or a 3D plane, then knock yourself out. There, scale speed is meaningless.

I attended another clubs fun fly and there was this nice Tiger Moth with WAY too much engine. Hovering a Tiger Moth, flying it inverted and doing a screaming flyby just plain looked dumb.

Yeah, yeah, I know. I hear all the time that the larger engine is there for balance and "reserve power if you get into trouble." I have NEVER seen an over powered plane run at a lower throttle setting just to keep the extra power in reserve. And what "trouble?" Extra umph to get that plane over in that outside loop? Power out of a stall five feet over the deck?

Sure, it's a free country and everyone is free to put whatever the want in their plane but I just don't see the rationale.

I support #'s 13,14 and 15 of post number 5

#14 brings up a funny point .

Sometime ask someone who has on of these types of planes
to try a less than full power take off. If is a tail dragger , it could be
quite funny to watch.......Especially in a cross wind.

Regards
Roby

Well, you could probably rip off the wings with the smallest "recommended" motor if you tried. Going to a .61 on a .50 sized airplane will give more vertical. If you use the throttle to control your speed and prop the airplane correctly, you will have no trouble whatsoever. What I mentioned about maunfacturers being conservative, then a .61 might be the perfect choice. In large airplanes that are meant for fully unlimited "oversized" motors, throttle control is essential or the airplane WILL self destruct. Just check your balance and place your servos accordingly.

With the quality of Arfs thse days improving, two areas IMHO have not improved and that is the firewall and landing gear. If you do not add strength to them, they will blow right out if the prop were powered by a "rubber band."

ALTITUDE- Also altitude is a big factor, Your 60 size engine can perform more like a 40 size and we have the numbers to prove it. Since technology is improving , we can now have 90 type performance in a 60 size casing.

SPEED- There are those who like a simple 46 in a P51 and those who like 90s or 100's. With proper "minor modifications" can be just fine. I like speed but speed does not have to be a Q500 plane.

PERFORMANCE- I like to have the power available if I need it.

Lets take the Modeltech P-47 (90 size) Many here are running a 90 size engine. Thats nice for their area. Up here, the plane will fly but not good. I run a 1.08 in mine and its a good combination.

To me , an underpowered plane flys like it has 50%expo, all sluggish and wishywashy. As far as money goes, basic engines are not all that expensive. Also you get what you pay for, you go the cheap route and you will be here as many are consistently asking how to fix the same ol thing over and over and over again.

Re: Going to a .61 on a .50 sized airplane, there is also something to be said for being able to run a bigger prop at lower rpm for better performance. I had a 40 size engine on my LT40 trainer. It worked but when the grass hadn't been cut in 2 weeks because it rained everyday it made for some pretty slow and scary takeoffs. After I started teaching and a new guy came out with an LT40 with a 46 engine on the front the extra oomph really helped both on the field and in the air when the wind whipped up which it did quite often at our field. The plane didn't really fly any faster but the extra power was there when needed. [8D]

Its obvious that its a matter of prefrence and if you are a scale guy you would expect to put an engine in your plane that will make it look and fly authentic. However I see the biggest reason for overpowering is for 3D flying. You need that reserve power for manuvers slow and low that may stall your plane and make it unrecoverable with the reccomended engine. I cannot remember what magazine I read it in but it was on a an Extra 300 or 330 and the article stated that the recomended engine wouldnt be enough for 3D and that the tester pilot used an enormous engine for the plane and specifically noted to use caution when flying because unless you were on an up line you could not go full throttle because it would tear the plane apart. And the maufacture put a disclosure in the instructionds that using an overpowered engine would void the warranty of the ARF. I am currently assembling a Funtana 90 with a YS 1.40 sport. To quote "not more than you need just more than your used to."