What engine to buy!

What engine to buy!
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What engine to buy! - 6/7/2006 9:04:25 PM

Posts: 70
Joined: 2/4/2006
From: New Delhi, INDIA
Status: offline

Hi

I have the World Mode Extra 330 L. (.60 2 stroke - .90 4 stroke)

I am confused as to what engine to buy.

Options:

1. O.S. .61 FX

2. Super Tiger .90

3. Magnum .91 Four Stroke!

Which one to buy? Although I want the four stroke but I heard that one has to tune the Four Stroke after every two flights and its painful when it comes to tuning it! How is the Magnum engine? I am confused!

The company manual strictly says - .61 2S or .91 FS

Will I get more power on a 90 Fs than that of a 60 2S?

Kindly help!!

Thanks in advance!

Sawan

RE: What engine to buy! - 6/7/2006 11:49:24 PM

Rate1

Posts: 511
Joined: 7/19/2004
From: Stockholm, SWEDEN
Status: offline

I think you should think of it as either .60-.90 2-stroke or .90-1.20 4-stroke. My suggestion is a 1.20 4-stroke. If weight is an issue consider the new Saito 1.25, same weigt as a regular .90 4-stroke. Myself found my OS 120 Surpass III pumped an excellent choise for my Greatplanes Extra 300 .60. Do a search here on RCU in different aerobats in the .60 size and have a look for yourself and see that many go for the bigger alternative. My plane did not suffer of a high wingload dispite chosing the biggest engine. Land at crawl speed and vertical untill I could not see the plane. You do not need to tune your engine after every second flight. If you would have to re-tune your engine once a year, wich I doubt, it is easy done following the instructions in the manual if there is not a fellow modeler that could show you how.

< Message edited by Rate1 -- 6/7/2006 11:53:59 PM >

_____________________________

<--- This is my dog, Capt Morgan, and he has propably more flight hours than you.

(in reply to Dr Crash)

RE: What engine to buy! - 6/8/2006 5:32:11 AM

nickj

Posts: 497
Joined: 5/24/2005
From: Danville, CA, USA
Status: offline

Do you want an airplane or a rocket ship? Model designers engineer a plane for a specific engine size--that's how they want you to think of it--not as a suggestion, but as the best way to power the plane they designed. It's not as if they don't know what they're doing. A heavy, overpowered plane may go anywhere you point it, but it can't be as responsive as a well-balanced, lightly-loaded aerobat. About the worst thing you can say for a .60-sized plane with a .60 engine is that it might take a little more skill to fly it at the limit.

(in reply to Rate1)

RE: What engine to buy! - 6/8/2006 6:21:36 AM

Rate1

Posts: 511
Joined: 7/19/2004
From: Stockholm, SWEDEN
Status: offline

I agree, a plane should not suffer from too much weight. However I think power is good as long as the plane is in balance. Everybodys taste is different and I like power as long as the plane does not suffer from a too heavy wing load. One way of doing this is to use selected light hardware and to plan the set-up so you do not need to add lead. Some people had a beef with me putting on a 120 4-stroke on my .60 plane, only to be proven wrong since it could fly at a walks pace and then rocket out if I wanted to. After seing my plane no one would like any smaler engine on it. Myself being a commercial pilot and do know something about aeroplanes. A designer does compromise when making a new plane and this applies to all planes even full-scale, that is why you can order a full-scale plane with dif engine options. Obviosly the designer wants to cover a span of choises just as they do when producing cars where the smallest engine might not be the optimal choise. The optimal choise is up to you. However, with planes don't look at it as power but in terms of weight and then compere the different engines weight between .60 2-stroke and the .90 4-stroke, inluding Saito 100 and 125 wich really is designed around 90 size crank house. On my plane I did lightening everywhere I could and selected nice light hardware so I could put on a 120 and still be within nice weight limits. The rest is throttle managment.
Having that said I truly belive this plane would fly great on a .60 size 2-stroke, but only later wanting to put on something bigger to get an unlimited plane. And yes a plane with less power is harder to fly and this goes for full-scale as well. Just don't over do it and a 120 FS is not over doing it eventhough it is a real power house for this size. As I said, it all boils down to a matter of taste and what you want from your plane. Some want more and other less. Regardless, it is real fun having a rocket to call for whenever you feel for it. Also you did pick up an aerobat not a Cub.

< Message edited by Rate1 -- 6/8/2006 7:02:28 AM >

_____________________________

<--- This is my dog, Capt Morgan, and he has propably more flight hours than you.

(in reply to nickj)

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