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Does Size Matter?

Will a good big `un always beat a good small `un?

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Dai Fledermaus18/09/2015 16:16:12
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No, I'm not trying to give the Mods apoplexy, I'd just like to know if bigger model aircraft fly better or any differently to smaller ones.

To take a hypothetical example, a flyer takes along to the field two models one an exact copy of the other but larger, lets say twice the size, both suitably powered. Given the same conditions of wind etc, would one fly any better than the other?

Dave Hopkin18/09/2015 16:39:21
3672 forum posts
294 photos

They are certainly easier to retain orientation with......

Braddock, VC18/09/2015 16:47:17
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Well, Dai. Yes and no, wink.

MattyB18/09/2015 16:58:32
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Posted by Dai Fledermaus on 18/09/2015 16:16:12:

No, I'm not trying to give the Mods apoplexy, I'd just like to know if bigger model aircraft fly better or any differently to smaller ones.

To take a hypothetical example, a flyer takes along to the field two models one an exact copy of the other but larger, lets say twice the size, both suitably powered. Given the same conditions of wind etc, would one fly any better than the other?

Define "better". The bigger one will handle wind more easily, be more stable, present at a more scale speed (if it is a scale model) etc. The smaller one will be nimbler, easier to operate on a tight site, and may appear faster (even if it isn't). Which is better? You decide, but as one well known columnist espouses, "he who has the most toys wins" - having both available is the best situation!

cymaz18/09/2015 17:23:09
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9253 forum posts
1195 photos

The bigger the club strip...the bigger the model

The bigger the model , the easier it's seen from further away. At my age I am in need of the bigger model

"And that's all I have to say about that..." ( Forrest Gump )

Edited By cymaz on 18/09/2015 17:25:39

Don Fry18/09/2015 17:56:07
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4557 forum posts
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Cymas speaks wisdom, but I have to say big uns don't bounce as well.

Owdlad18/09/2015 17:57:37
222 forum posts
140 photos

Simple Equation........ the bigger the model = bigger the cost.

In my opinion large models are just big monstrosities and cause no end of problems at clubs ie noise issues.. before forum members get all hot under the collar, I'm a great believer in letting those that want? Want......But speaking from experience the larger the model the larger the hasltle, anyway above a certain size they all look the same.

I've now downsized and enjoying the hobby again and don't miss flying large models

Owdlad

fly boy318/09/2015 18:02:31
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3676 forum posts
22 photos

Years ago I read an article about this subject, and there is a technical reason why a larger model flies better. Cannot remember why, some thing about not being able to scale air molecules etc.Perhaps Bebb might enlighten us. Cheers

Edited By fly boy3 on 18/09/2015 18:08:15

Josip Vrandecic -Mes18/09/2015 19:04:40
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2993 forum posts
260 photos

Hi Dai , your question is intriguing, but I have no answer sad. My personal experience,so far, have told me that, for my age and visual acuity, best size is 60' (wingspan), on the other hand I saw a small indoor model that flying enchanting...so...?

P.S.

I'm also waiting for Mr. BEB.....face 1

eflightray18/09/2015 19:06:06
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622 forum posts
132 photos

I like them BIG wink

Especially when it comes to flying in a scale like manner.

Compare just about any scale model video with a full size video say from an airshow, the model stands out straight away, it appears way too fast, unless quite big.

If speed is your thing, then smaller is generally better, (they often appear and sound faster than they really are).

For aerobatics, a large model appears much more precise, (and the size can show up minor faults in competition aerobatics).

As for the micro models, ........ , if you like them fine.

Ray.

( 100" span, 98" span, 93" span, 90" span, (scratch built multi-motors), the rest are 72" span and under.)

cymaz18/09/2015 19:14:22
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Posted by fly boy3 on 18/09/2015 18:02:31:

Years ago I read an article about this subject, and there is a technical reason why a larger model flies better. Cannot remember why, some thing about not being able to scale air molecules etc.Perhaps Bebb might enlighten us. Cheers

Edited By fly boy3 on 18/09/2015 18:08:15

Something to do with the Reynolds Number ......I think

iqon18/09/2015 20:07:38
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1487 forum posts
239 photos

I think bigger - better - easiersmiley

FlyinBrian18/09/2015 20:13:08
637 forum posts
4 photos

The question is "if big models fly better than small models"

I'd say simply Yes they do, whether they are more or less practical, costly etc un-doubtably the answer is also yes but they do fly better

Martin Harris19/09/2015 00:05:25
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9337 forum posts
249 photos

+1 for that, Brian...more or less what I was going to post!

My largest scale model (1:1) even flies infinitely better than the real thing - but it is a lawnmower wink!

Edited By Martin Harris on 19/09/2015 00:08:51

Bob Cotsford19/09/2015 10:12:57
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8581 forum posts
477 photos

I find my Acrowot XL nicer to fly in many respects than my kit built standard Acrowot, though the little one is better where the landing area is restricted - as has been pointed out, small models are more nimble, big ones need a little elbow room.

Phil Green19/09/2015 10:37:59
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1598 forum posts
339 photos

We see huge expensive models at the field, and the owners are tense and nervous as they have a lot to lose.
On the other hand we budget modellers and our modest models have more fun for much less outlay and with very little to lose if the worst happens! For pure fun, a good little 'un beats a big 'un every time!

023.jpg

 

021.jpg

 

image420.jpg

 

 

Edited By Phil Green on 19/09/2015 10:40:53

fly boy319/09/2015 10:45:15
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3676 forum posts
22 photos

Nice one Phil, can't argue with that. LoL

FlyinBrian19/09/2015 12:01:08
637 forum posts
4 photos

Love those little biplanes Philyes

Phil Green19/09/2015 12:41:17
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1598 forum posts
339 photos

It the 8" span "Gnat" from 1964 by D McClain (not the American Pie one!)

Plans on Outerzone

eflightray19/09/2015 13:24:31
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622 forum posts
132 photos

Phil, your second picture bought back some memories, look what's in the corner of my flight box, (admittedly modified for pulse proportional) smiley

orion1a.jpg

 

And no, it wasn't used with the Orion, I actually used an RSC Digi-3 modified to four channel for that. A long, long time ago.

P.S. Even the Orion was 'modified', a friend gave me the fuselage, so I built a new wing for it.

 

Edited By eflightray on 19/09/2015 13:29:10

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