Power requirements

John Goddard Wed Feb 08, 2012 9:06 am

Not sure if this is in wrong section or not boyz but here go's....
Having 'successfully' built and flown the Bacaruda http://www.fmkmodels.com/rainbow-model-plane-kit-010-micro-radio-control-rc-balsa-sma-cox-010-020-miniature-aircraft-factory-18-p.asp
I've now started on FMK's Aerobic http://www.fmkmodels.com/aerobic-020-fun-fly-rc-model-plane-kit-micro-radio-electric-ic-miniature-aircraft-factory-funfly-39-p.asp

The Rainbow Bacaruda is designed for an 010 but in various places quote 010 to 020. I wish I'd stuck an 020
on the front cos I'm not a 'marginally powered' kinda guy and IMHO it is underpowered at 131g FFAUW.
The Aerobic states 020 power. Although physically it's nearly twice the size it does appear a VERY light build, with ally boom fuz (I'll swap for C/F) built up tail and surfaces etc. However
Bearing in mind it's an aerobat do you guys recon an 020 will have 'The Minerals' ?
I've got PeeWee and TeeDee 020's which would both be throttled or should I just bung a sure start up front?
Huh...

nitroairplane Wed Feb 08, 2012 9:09 am

Keep it light and put a tee dee .020 up front.
What is the WS?
I will soon be building another rainbow and may try to add ailerons and a throttled .010 if possible.
Indra

John Goddard Wed Feb 08, 2012 9:14 am

nitroairplane wrote:Keep it light and put a tee dee .020 up front.
What is the WS?
I will soon be building another rainbow and may try to add ailerons and a throttled .010 if possible.
Indra

Span 22ins Indra.
If I built another Rainbow I'd Def stick ailerons on, I'd prob lose the dihedral as well.
Obviously the Aerobic will have 5 servos and a bigger Batt but I reckon sub 9oz
but the wing loading wil be shedload lighter.

nitroairplane Wed Feb 08, 2012 9:16 am

John Goddard wrote:
nitroairplane wrote:Keep it light and put a tee dee .020 up front.
What is the WS?
I will soon be building another rainbow and may try to add ailerons and a throttled .010 if possible.
Indra

Span 22ins Indra.
If I built another Rainbow I'd Def stick ailerons on, I'd prob lose the dihedral as well.
Obviously the Aerobic will have 5 servos and a bigger Batt but I reckon sub 9oz
but the wing loading wil be shedload lighter.

Well 9oz if you put a throttled .049 you may have a 3d plane Huh...

**Cribbs74** Wed Feb 08, 2012 9:17 am

John,

At 9oz I think the throttled TD .020 would be the best fit.

nitroairplane Wed Feb 08, 2012 9:18 am

cribbs74 wrote:John,

At 9oz I think the throttled TD .020 would be the best fit.

Yes Ron but have you seen the planes Johnboy flies?

**Cribbs74** Wed Feb 08, 2012 9:21 am

Indra,

No, just the Barracuda. Something I should know? I was just going off weight and the knowledge of what a TD .020 can pull.

John Goddard Wed Feb 08, 2012 9:22 am

nitroairplane wrote:
cribbs74 wrote:John,

At 9oz I think the throttled TD .020 would be the best fit.
Yes Ron but have you seen the planes Johnboy flies?

Badly...

nitroairplane Wed Feb 08, 2012 9:22 am

Take a look Smile

https://www.youtube.com/user/bustabloodklaaart/videos

nitroairplane Wed Feb 08, 2012 9:22 am

John Goddard wrote:
nitroairplane wrote:
cribbs74 wrote:John,

At 9oz I think the throttled TD .020 would be the best fit.
Yes Ron but have you seen the planes Johnboy flies?

Badly...

Chat box?

**Cribbs74** Wed Feb 08, 2012 9:33 am

John Goddard wrote:
nitroairplane wrote:
cribbs74 wrote:John,

At 9oz I think the throttled TD .020 would be the best fit.
Yes Ron but have you seen the planes Johnboy flies?

Badly...

I watched couple vids, I wouldn't describe it as badly by any stretch.

nitroairplane Wed Feb 08, 2012 9:34 am

cribbs74 wrote:
John Goddard wrote:
nitroairplane wrote:
cribbs74 wrote:John,

At 9oz I think the throttled TD .020 would be the best fit.
Yes Ron but have you seen the planes Johnboy flies?

Badly...

I watched couple vids, I wouldn't describe it as badly by any stretch.

Neither would I!

John Goddard Wed Feb 08, 2012 9:35 am

Can't remember how to do it.
Sadly story of my life, just ask 'She who must be obeyed'
Very Happy

nitroairplane Wed Feb 08, 2012 9:36 am

John Goddard wrote:Can't remember how to do it.
Sadly story of my life, just ask 'She who must be obeyed'

!
What kind of performance do you want from this plane though?

John Goddard Wed Feb 08, 2012 9:37 am

So are there an excepted
Weight to capacity figures for other sizes in the Cox range like the sub 7oz for an 010?

nitroairplane Wed Feb 08, 2012 9:38 am

John Goddard wrote:So are there an excepted
Weight to capacity figures for other sizes in the Cox range like the sub 7oz for an 010?

Well pee wee sub 11oz and tee dee about sub 13oz.
Come to http://coxengineforum.forumakers.com/chatbox/index.forum? and we can figure it all out clearly.

John Goddard Wed Feb 08, 2012 9:41 am

nitroairplane wrote:
John Goddard wrote:Can't remember how to do it.
Sadly story of my life, just ask 'She who must be obeyed'

!
What kind of performance do you want from this plane though?

Well I'm not expecting the same as your new Yak/which was 4 cell powered and decribed by
our 3 d expert as The Most Rediculously overpowered thing he'd ever flown,
But something that will pull out of a prop hang hopefully.
Very Happy

nitroairplane Wed Feb 08, 2012 9:44 am

John Goddard wrote:
nitroairplane wrote:
John Goddard wrote:Can't remember how to do it.
Sadly story of my life, just ask 'She who must be obeyed'

!
What kind of performance do you want from this plane though?

Well I'm not expecting the same as your new Yak/which was 4 cell powered and decribed by
our 3 d expert as The Most Rediculously overpowered thing he'd ever flown,
But something that will pull out of a prop hang hopefully.

Well maybe a throttled surestart is what you need!

proctor Wed Feb 08, 2012 10:31 am

[b]Just a thought, my micro stick, 22"span, 5oz with battery in ready to fly with a
TD 0.020, prop on backwards flew like a rocket and almost got away from me.
It,s a chubby little rascal with quite a thick Clark Y section.
Where can I get a throttle for my TD 0.020?

nitroairplane Wed Feb 08, 2012 10:33 am

proctor wrote:[b]Just a thought, my micro stick, 22"span, 5oz with battery in ready to fly with a
TD 0.020, prop on backwards flew like a rocket and almost got away from me.
It,s a chubby little rascal with quite a thick Clark Y section.
Where can I get a throttle for my TD 0.020?

EBAY or if it is thick walled cylinder you could easily make one.

microflitedude Wed Feb 08, 2012 10:58 am

nitroairplane wrote:
John Goddard wrote:
nitroairplane wrote:Keep it light and put a tee dee .020 up front.
What is the WS?
I will soon be building another rainbow and may try to add ailerons and a throttled .010 if possible.
Indra

Span 22ins Indra.
If I built another Rainbow I'd Def stick ailerons on, I'd prob lose the dihedral as well.
Obviously the Aerobic will have 5 servos and a bigger Batt but I reckon sub 9oz
but the wing loading wil be shedload lighter.

Well 9oz if you put a throttled .049 you may have a 3d plane

You'll have a DIY Lawn-Dart.

John Goddard Fri Feb 10, 2012 5:28 am

As above, the rumour has now gone round that John's gone 'a bit weird' and is flying odd small aeroplanes....
I've had several calls in the last few days from guys want'ing rid of stuff from their attics
amongst which is this,-
Power requirements Pictur49

It's wing span is 55 ins weighs 585 grams (about 21 oz in 'old money') with it's esc and motor.
Will it fly with a sure start/texaco type thing?
J

andrew Fri Feb 10, 2012 7:32 am

John Goddard wrote:It's wing span is 55 ins weighs 585 grams (about 21 oz in 'old money') with it's esc and motor.
Will it fly with a sure start/texaco type thing?
J

It's a cutie, alright.

At 55", it's probably has a pretty good wing area and, consequently, a fairly light wing loading. The big 1/2A Herr Cub has a 48" span, 328 sq. in. area and AUW of 20 oz, so your plane is in the ballpark. I think it will fly just fine and very scale like. You may find after flying for a while that a throttle is in order so you can putz around even more slowly. You will need to ensure the covering and exposed areas are fuel proofed.

Kim's BOT is bigger and probably weighs nearly twice as much and his flys like a scaulded goose (that's redneck for "really gets after it") on a TD.

John Goddard Fri Feb 10, 2012 8:07 am

Cheers Andrew
I reckon it's about 400 sq in and with a throttle will be about 22oz.
J
I may cheat and stick a Lipo in and take it for a blast tomorrow.
Snowman

microflitedude Fri Feb 10, 2012 8:09 am

If the airframe was built to accommodate an electric motor, a glow motor may rip it apart. But a Texaco probably won't do much. (low RPM)

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