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Hangar 9 1/4 Scale Piper Cub ARF???

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Old 05-05-2012, 08:58 PM
  #1276  
Bob dunlop
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Default RE: Hangar 9 1/4 Scale Piper Cub ARF???


ORIGINAL: SrTelemaster150

ORIGINAL: SrTelemaster150

Did you order the Top Notch dummy engine kit?
ORIGINAL: Bob dunlop

Yep

Cool, let us know how it goes.

I want to get the 1/5 scale for my World Models Cub.
Will do

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Old 05-06-2012, 06:05 AM
  #1277  
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Default RE: Hangar 9 1/4 Scale Piper Cub ARF???

How hard is it to mount DLE 30 in this cub? Is there a template available???


Shane
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Old 05-06-2012, 06:40 AM
  #1278  
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Default RE: Hangar 9 1/4 Scale Piper Cub ARF???

Shane -
It is very easy.
1. Cut a hole in the bottom of the cowl large enough for the cylinder head to accomodate.
2. Attach standoffs to the the engine
3. Stand plane vertically so that the firewall is parallel to the ground. (I hung mine on the back of a tall chair by the gear)
4. set the engine inverted on the firewall and slide the cowl over the engine. (Leave off the muffler and spark plug)
5. I taped the cowl where I wanted it.
6. Move the engine around using the prop shaft and cylinder head until you like the fit in the cowl. (you may need to adjust the hole in the cowl)
7. When you like the fit carefully remove the cowl without moving the engine.
8. Carefully draw circles around the standoffs on the firewall.
9. Remove the engine and standoffs and drill out the center of the circles.

I just did this 2 weeks ago for my DLE 30 and it worked great. You will notive that the engine with stock standoffs is a little bit to long. Just slide the cowl out a little and carefully drill your cowl attachment holes and I think you will be happy without any need to use alternative standoffs.

Remember to reinforce the back side of the firewall with some fiberglass as this is a big engine with more vibration than I think the plane was designed for. On my first flight one of the rods between the rudder and stab broke at the metal ring due to engine vibration...and that with a brand new balanced Xoar 18x8 prop. Of course the engine is set rich for break in.

Good Luck
Tim
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Old 05-06-2012, 07:36 AM
  #1279  
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Default RE: Hangar 9 1/4 Scale Piper Cub ARF???

im thinking of a custom made small tru turn alum spinner.......If I keep the cone small it should look good. I can also paint it black or cub yellow to blend it if silver doesnt cut it.......
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Old 05-06-2012, 07:50 AM
  #1280  
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Default RE: Hangar 9 1/4 Scale Piper Cub ARF???

Found a site last night that has 12mm WWI prop nut and spinner...problem is its 1.75 pitch thread and we need 1.5 pitch...I'm gonna call them Monday and see if they can make it in 12mm x 1.5
sierragiant.com
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Old 05-06-2012, 08:16 AM
  #1281  
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Default RE: Hangar 9 1/4 Scale Piper Cub ARF???

Blitz,

from the pictures it appears that you have not cut out the openings in the cowl cheeks. Therefore no air can flow through the cowl. I have the PNP version with the zenoah 20 and it came with these already cut open. I dont have any cooling problems.

besides, these are big open air catchers on the real cubs so it does not look wrong to have them open.

can someone post a good pic of this opening so we can see it?

Fly
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Old 05-06-2012, 09:52 AM
  #1282  
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Default RE: Hangar 9 1/4 Scale Piper Cub ARF???

Here are a couple of pictures of my J-3 Cub cowl cut out for the Dle 20 with stock muffler.
Thanks,
Eddie of OKC
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Old 05-06-2012, 10:22 AM
  #1283  
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Default RE: Hangar 9 1/4 Scale Piper Cub ARF???

Let me know what you come up with...."I won't maiden until I get the front end looking good. : )
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Old 05-06-2012, 01:21 PM
  #1284  
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Default RE: Hangar 9 1/4 Scale Piper Cub ARF???

The cheeks are the big black parts above the engine cylinders. The front of these need to be opened up for air to flow in down and around the engine. As long as the volume of air coming through the air openings on the bottom behind the the front of the cowl are larger than the volume of air coming in the front top of the cowl then the air will flow through the cowl and not around it.

Also.. if you create a slight air dam in front of the lower rear openings, this helps to create a vacuum to help force the air through the cowl.
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Old 05-06-2012, 03:25 PM
  #1285  
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Default RE: Hangar 9 1/4 Scale Piper Cub ARF???

Blitz, You just need to make the opening a little larger as in my pic's I posted to let the inlet air flow through the engine head/ fin area. Mine may have a larger opening for the exit also. The important part of the cooling is inlet air through the fins around the engine head and plenty of exit hole to get the hot air out of the cowl .....
My J-3 operates fine like I have done it.

Thanks,
Eddie
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Old 05-06-2012, 03:37 PM
  #1286  
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Default RE: Hangar 9 1/4 Scale Piper Cub ARF???


ORIGINAL: tevans55

Shane -
It is very easy.
1. Cut a hole in the bottom of the cowl large enough for the cylinder head to accomodate.
2. Attach standoffs to the the engine
3. Stand plane vertically so that the firewall is parallel to the ground. (I hung mine on the back of a tall chair by the gear)
4. set the engine inverted on the firewall and slide the cowl over the engine. (Leave off the muffler and spark plug)
5. I taped the cowl where I wanted it.
6. Move the engine around using the prop shaft and cylinder head until you like the fit in the cowl. (you may need to adjust the hole in the cowl)
7. When you like the fit carefully remove the cowl without moving the engine.
8. Carefully draw circles around the standoffs on the firewall.
9. Remove the firewall and drill out the center of the circles.

I just did this 2 weeks ago for my DLE 30 and it worked great. You will notive that the engine with stock standoffs is a little bit to long. Just slide the cowl out a little and carefully drill your cowl attachment holes and I think you will be happy without any need to use alternative standoffs.

Remember to reinforce the back side of the firewall with some fiberglass as this is a big engine with more vibration than I think the plane was designed for. On my first flight one of the rods between the rudder and stab broke at the metal ring due to engine vibration...and that with a brand new balanced Xoar 18x8 prop. Of course the engine is set rich for break in.

Good Luck
Tim

Tim, does the firewall have thrust lines marked on it?
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Old 05-06-2012, 05:06 PM
  #1287  
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Default RE: Hangar 9 1/4 Scale Piper Cub ARF???


ORIGINAL: cannonball200

Blitz, You just need to make the opening a little larger as in my pic's I posted to let the inlet air flow through the engine head/ fin area. Mine may have a larger opening for the exit also. The important part of the cooling is inlet air through the fins around the engine head and plenty of exit hole to get the hot air out of the cowl .....
My J-3 operates fine like I have done it.

Thanks,
Eddie
Thanks, Iopened the bottom up some more and made the two holes below the prop hole slightly larger as well. Currently using a Xoar 16x6 for break-in. Even with this prop it has plenty of power with the DLE-20. Mine came out pretty light. 14.4lbs empty and right at the aft CG limit. So far it flys great and is a hoot for touch-n-go's! Still needs some fine tuning like dialing in some differential on the ailerons and work on a throttle curve.

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Old 05-06-2012, 05:38 PM
  #1288  
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Default RE: Hangar 9 1/4 Scale Piper Cub ARF???

Anyone open up a bottom rear hole as an air exit for an electric motor setup?
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Old 05-06-2012, 05:49 PM
  #1289  
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Default RE: Hangar 9 1/4 Scale Piper Cub ARF???


ORIGINAL: aerobatixkid


ORIGINAL: tevans55

Shane -
It is very easy.
1. Cut a hole in the bottom of the cowl large enough for the cylinder head to accomodate.
2. Attach standoffs to the the engine
3. Stand plane vertically so that the firewall is parallel to the ground. (I hung mine on the back of a tall chair by the gear)
4. set the engine inverted on the firewall and slide the cowl over the engine. (Leave off the muffler and spark plug)
5. I taped the cowl where I wanted it.
6. Move the engine around using the prop shaft and cylinder head until you like the fit in the cowl. (you may need to adjust the hole in the cowl)
7. When you like the fit carefully remove the cowl without moving the engine.
8. Carefully draw circles around the standoffs on the firewall.
9. Remove the firewall and drill out the center of the circles.

I just did this 2 weeks ago for my DLE 30 and it worked great. You will notive that the engine with stock standoffs is a little bit to long. Just slide the cowl out a little and carefully drill your cowl attachment holes and I think you will be happy without any need to use alternative standoffs.

Remember to reinforce the back side of the firewall with some fiberglass as this is a big engine with more vibration than I think the plane was designed for. On my first flight one of the rods between the rudder and stab broke at the metal ring due to engine vibration...and that with a brand new balanced Xoar 18x8 prop. Of course the engine is set rich for break in.

Good Luck
Tim

Tim, does the firewall have thrust lines marked on it?
Shane-
The firewall already has the appropriate thrust set. You don't have to make any additional thrust down or right.
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Old 05-07-2012, 09:49 AM
  #1290  
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Default RE: Hangar 9 1/4 Scale Piper Cub ARF???


ORIGINAL: hidaven

Anyone open up a bottom rear hole as an air exit for an electric motor setup?
Hey guys..just came back from the field and the maiden of my Cub...Wow! This has got to be the easiest plane I have ever flown!
Also...this is the fIrst plane I've ever maidened that didnt require at least a little trim ...flies great at 1/3 to 1/2 throttle but also hauls the mail wide open..at least for a Cub anyway..LOL.
Anyway..to answer your question..I didn't make any extra openings in the cowl or fusalage
and the motor was just barely warm even after a 10 minute flight with a couple wide open passes.
One of my flights was about 12 minutes and the batteries were at about 3.75 a cell after landing and taxiing in from across the field...perfect!
This was with an 18x10 Xoar wwI Saber prop...I have a 19x10 and 20x10 I will try tomorrow.
CG feels right on the money at 4 1/4"....comes in real slow and gentle with power off...I did the Oring mod but this plane lands so gentle I'm not sure how necessary it it is...can't hurt anyway I guess
Probably the least exciting maiden I've had yet !...felt like I've been flying it all summer...H9 rules!
Bob
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Old 05-07-2012, 11:47 AM
  #1291  
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Default RE: Hangar 9 1/4 Scale Piper Cub ARF???


ORIGINAL: Bob dunlop


ORIGINAL: hidaven

Anyone open up a bottom rear hole as an air exit for an electric motor setup?
Hey guys..just came back from the field and the maiden of my Cub...Wow! This has got to be the easiest plane I have ever flown!
Also...this is the fIrst plane I've ever maidened that didnt require at least a little trim ...flies great at 1/3 to 1/2 throttle but also hauls the mail wide open..at least for a Cub anyway..LOL.
Anyway..to answer your question..I didn't make any extra openings in the cowl or fusalage
and the motor was just barely warm even after a 10 minute flight with a couple wide open passes.
One of my flights was about 12 minutes and the batteries were at about 3.75 a cell after landing and taxiing in from across the field...perfect!
This was with an 18x10 Xoar wwI Saber prop...I have a 19x10 and 20x10 I will try tomorrow.
CG feels right on the money at 4 1/4''....comes in real slow and gentle with power off...I did the Oring mod but this plane lands so gentle I'm not sure how necessary it it is...can't hurt anyway I guess
Probably the least exciting maiden I've had yet !...felt like I've been flying it all summer...H9 rules!
Bob
I felt the same way but remember this plane is not a trainer. Before anyone decides to blast me for this comment research the design behind the airframe and why it was built in the first place.
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Old 05-07-2012, 12:39 PM
  #1292  
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Default RE: Hangar 9 1/4 Scale Piper Cub ARF???

I've never flown an "official Trainer" but....and this is my opinion ....this plane is really slow and gentle and easy to fly....
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Old 05-07-2012, 12:48 PM
  #1293  
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Default RE: Hangar 9 1/4 Scale Piper Cub ARF???

ORIGINAL: Bob dunlop

I've never flown an ''official Trainer'' but....and this is my opinion ....this plane is really slow and gentle and easy to fly....

My trainer was not an "official trainer" either.

It was a SR Telemaster W/a Saito 150 jp front. I managed to solo W/O a trainer cord & didn't crash either. Not until after I soloed that is.
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Old 05-07-2012, 02:16 PM
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Default RE: Hangar 9 1/4 Scale Piper Cub ARF???

Bob, great info!
Im puzzled as to why you didnt get more flight time!?!??
I was figuring on 15 min. When you step up to the 19x10 you will probally be down in the 10 min range....
How was the 18x10 as a prop size? Did it have enough thrust for pulling out of trouble?

How was the roll out and landing on our 6 inch inflatables???
Lastly, did you watt meter to find out the amps?

Thanks!! dave
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Old 05-07-2012, 02:50 PM
  #1295  
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Default RE: Hangar 9 1/4 Scale Piper Cub ARF???


ORIGINAL: hidaven

Bob, great info!
Im puzzled as to why you didnt get more flight time!?!??
I was figuring on 15 min. When you step up to the 19x10 you will probally be down in the 10 min range....
How was the 18x10 as a prop size? Did it have enough thrust for pulling out of trouble?

How was the roll out and landing on our 6 inch inflatables???
Lastly, did you watt meter to find out the amps?

Thanks!! dave
Could prolly get 15 minutes if I really tried hard enough...I did a number of high speed passes and the wind was 12-15 mph.
The 18x10 had a ton of power...tires are awsome....
Didnt put a watt meter on it yet
Bob

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Old 05-07-2012, 06:09 PM
  #1296  
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Default RE: Hangar 9 1/4 Scale Piper Cub ARF???

you should probally put a watt meter on it not so much for the watts but for the amps........
make sure your not too close to the max amps of the esc.
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Old 05-07-2012, 06:35 PM
  #1297  
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Default RE: Hangar 9 1/4 Scale Piper Cub ARF???

Using a Castle 120 HV v2...not a chance of drawing too many amps with this setup
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Old 05-07-2012, 06:40 PM
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Default RE: Hangar 9 1/4 Scale Piper Cub ARF???

true........would help me out since i have a hv 85...........crossing my fingers that the amp draw is under 80
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Old 05-07-2012, 06:56 PM
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Default RE: Hangar 9 1/4 Scale Piper Cub ARF???

If the weather holds out I'll be flying again tomorrow and will check it out for you...pretty sure you'll be just fine w/ the 85
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Old 05-07-2012, 07:22 PM
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Default RE: Hangar 9 1/4 Scale Piper Cub ARF???

Bob, will the cub pull vertical and climb? Get some videos!!!
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