Cox Engines Forum
You are not logged in! Please login or register.

Logged in members see NO ADVERTISEMENTS!


1/2A RC model weight and covering problem.  Cox_ba12





Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Latest topics
» Jerobee electric to glow conversion nr 2
by OVERLORD Today at 11:08 am

» You got dope
by GallopingGhostler Today at 10:39 am

» New P-38 profile scratch build log
by rsv1cox Today at 10:08 am

» Bore-Sighting Your Mustang
by GallopingGhostler Today at 10:01 am

» music vids.. some of your favorites
by rsv1cox Today at 7:09 am

» The Breezy Hill Fall Festival Fly-In October 21st & 22nd.
by getback Today at 5:26 am

» Pen Pals of Younger Days
by Levent Suberk Yesterday at 4:37 pm

» Enya 11CX diesel carby
by sosam117 Yesterday at 11:47 am

» "Red Neck" .049 elec. starter
by getback Yesterday at 6:22 am

» The 2023 Annual World-Wide Ringmaster Fly-a-Thon October 7th & 8th.
by akjgardner Thu Sep 28, 2023 1:09 pm

» P-38 Lightning-Roddie style..
by akjgardner Thu Sep 28, 2023 1:05 pm

» The last piece of the puzzle
by rsv1cox Thu Sep 28, 2023 11:59 am

Cox Engine of The Month
September-2023
balogh's

"Beefed up old stock 290 on my Quickie100 RC after plenty of airtime hours..."



PAST WINNERS
CEF Traveling Engine

Win This Engine!
Gallery


1/2A RC model weight and covering problem.  Empty
Live on Patrol


1/2A RC model weight and covering problem.

Go down

1/2A RC model weight and covering problem.  Empty 1/2A RC model weight and covering problem.

Post  tru168 Wed Jul 09, 2014 11:37 pm

Hi all,

I'm going to build Rc models for 049 engine or pee wee.
I choose some nice old plan and before I start to build, most of members in other forums suggest that old model plans are actually under powered, and for sport flying, 049 models should not exceed 400g total weight, and 150g for Pee Wee.
That's make me worry.
In fact, I already built Skampy for my RC pee wee, but I haven't cover it yet. No dope and tissue in my country. Dope can't be ship from overseas. Lightweight covering film also not available here. I checked towerhobbies for light weight covering film, price sounds reasonable abut shipping cost to our country cost me USD68, which is too expensive for me.

My question is , do I need to follow the suggestion of 400g and 150g limit for sport models? Or just follow the old article's suggested weight?

I ordered Jap tissue but no dope, ( how I wish Bernie can sell dope in small can, I've heard that small can of liquid can be ship by airmail without problem ) I've heard about diluted PVA but I don't think its fuel proof . Normal monokote film will add quite a lot of weight, although it works for me on my 049 powered glider, but never try on pee wee model. Any suggestion please ?


Ew
tru168
tru168
Gold Member
Gold Member

Posts : 277
Join date : 2012-11-03
Location : Johor, Malaysia

Back to top Go down

1/2A RC model weight and covering problem.  Empty Re: 1/2A RC model weight and covering problem.

Post  batjac Thu Jul 10, 2014 3:56 am

I built this PeeWee .020 powered plane and covered it with Monokote.  Flew pretty good.  Total weight was 2.25oz or 64gm.

https://www.coxengineforum.com/t5588-latest-plane-finished-yesterday-maidened-today

The Mono-Mark
batjac
batjac
Diamond Member
Diamond Member

2022 Supporter

2023 Supporter

Posts : 2293
Join date : 2013-05-22
Age : 60
Location : Broken Arrow, OK, USA

Back to top Go down

1/2A RC model weight and covering problem.  Empty Re: 1/2A RC model weight and covering problem.

Post  Surfer_kris Thu Jul 10, 2014 4:03 am

It depends on the plane style a lot but 400g and 150g are good recommendations for a modern sports plane with a throttle. You will then have a power to weight ratio of about one. For level flight you can certainly manage with a much lower power to weight ratio. So if you fly without a throttle the weights can be higher, and if the wing area is large the weights can be higher too.

Don't diss what people did in the past, they did some great stuff considering what was available at the time. Nowadays with modern radios, anyone can build a model that is light enough and has full house controls...
Surfer_kris
Surfer_kris
Diamond Member
Diamond Member

Posts : 1878
Join date : 2010-11-20
Location : Sweden

Back to top Go down

1/2A RC model weight and covering problem.  Empty Re: 1/2A RC model weight and covering problem.

Post  ian1954 Thu Jul 10, 2014 4:10 am

Is this Hobby Shop close by?

http://www.singahobby.com/?q=node/31533
ian1954
ian1954
Diamond Member
Diamond Member

Posts : 2688
Join date : 2011-11-16
Age : 69
Location : England

Back to top Go down

1/2A RC model weight and covering problem.  Empty Re: 1/2A RC model weight and covering problem.

Post  tru168 Thu Jul 10, 2014 7:20 am

Hi,


Thank you all for reply, yes Ian, The link really helpful, I'm about 100km from the hobby shop. I will contact them now. Thanks!
tru168
tru168
Gold Member
Gold Member

Posts : 277
Join date : 2012-11-03
Location : Johor, Malaysia

Back to top Go down

1/2A RC model weight and covering problem.  Empty Re: 1/2A RC model weight and covering problem.

Post  pkrankow Thu Jul 10, 2014 8:22 am

A bee engine will pull a 2m glider aloft fine. With RC wing loading is more important than all up weight, although the style of performance will change.

Phil
pkrankow
pkrankow
Top Poster
Top Poster

Posts : 3025
Join date : 2012-10-02
Location : Ohio

Back to top Go down

1/2A RC model weight and covering problem.  Empty Re: 1/2A RC model weight and covering problem.

Post  tru168 Thu Jul 10, 2014 11:48 pm

Hi Phil,

I'm flying a 1.7m glider with baby bee Texaco style without problem. I think I will try monokote on my skampy and see what's the all up weight, the modern receiver/ battery/ servo are much lighter than early day, and should be compensate the weight I think.

Ew
tru168
tru168
Gold Member
Gold Member

Posts : 277
Join date : 2012-11-03
Location : Johor, Malaysia

Back to top Go down

1/2A RC model weight and covering problem.  Empty Re: 1/2A RC model weight and covering problem.

Post  Sponsored content


Sponsored content


Back to top Go down

Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum