RC Warbirds and Warplanes Discuss rc warbirds and warplanes in this forum.

Spitfire arf 95" phoenix assembly

Reply
Old 10-16-2017, 11:54 AM
  #51
Lifer
 
Lifer's Avatar
 
Join Date: Aug 2008
Location: Kansas City, MO
Posts: 4,012
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Video?
Lifer is offline  
Reply With Quote
Old 10-16-2017, 02:32 PM
  #52
Flyfast1
 
Join Date: Sep 2005
Location: Livermore, CA
Posts: 927
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Quote:
Originally Posted by Shaun Evans View Post
Nice work, Sir.

Got to fly mine this weekend. She flies GREAT! Nice, slow landings but pretty sluggish on a 55RA. The cowl definitely needs venting. The P-51 spinner looks fine on it, btw. The retracts held air for a week and worked great.
Shaun,

Nice to hear. Which spinner are you using?

-Ed B.
Flyfast1 is offline  
Reply With Quote
Old 10-16-2017, 04:19 PM
  #53
Shaun Evans
 
Shaun Evans's Avatar
 
Join Date: Jan 2002
Location: San Diego, CA
Posts: 7,076
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Hi,

I'm using the Dave Brown P-51 or 'parabolic' spinner.
Shaun Evans is offline  
Reply With Quote
Old 10-17-2017, 04:44 AM
  #54
Hot Rod Todd
 
Hot Rod Todd's Avatar
 
Join Date: Oct 2002
Location: Robins, IA
Posts: 1,075
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Shaun, did you try the stock spinner to see if it spun up ok, or were you afraid to use it because of the little screws holding it together?

I would imagine you used the 6" diameter spinner. It matched up to the cowl well?
Hot Rod Todd is offline  
Reply With Quote
Old 10-17-2017, 05:55 AM
  #55
Shaun Evans
 
Shaun Evans's Avatar
 
Join Date: Jan 2002
Location: San Diego, CA
Posts: 7,076
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Spinner

Todd,

No I tried it. Got about half throttle before the end of the cone was doing about an inch of run-out and trying to shake the plane to pieces. It was scary. The DB 6" fits the cowl perfectly.

Last edited by Shaun Evans; 10-17-2017 at 02:35 PM.
Shaun Evans is offline  
Reply With Quote
Old 10-17-2017, 07:11 AM
  #56
Hot Rod Todd
 
Hot Rod Todd's Avatar
 
Join Date: Oct 2002
Location: Robins, IA
Posts: 1,075
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

I was afraid of that. Even if it holds up for a while, all it takes is one time in flight to go out of balance and it could be all over. Spinner breaks prop, out of balance prop breaks engine out of the nose, plane comes down. I just wish there was a better spinner option. The Mk XIV Spitfire has a very long spinner that's quite distinctive. As an example, the stock spinner is 7" long, the Dave Brown is less than 6" (based on dimensions I've seen). The Spitfire spinner is a bit more pointy than the P-51 style as shown in the comparison photo.

If anyone has a line on a more scale option for a spinner, please post.
Attached Thumbnails
Click image for larger version

Name:	Nose compare.jpg
Views:	52
Size:	103.8 KB
ID:	2241440  
Hot Rod Todd is offline  
Reply With Quote
Old 10-18-2017, 07:12 AM
  #57
Hot Rod Todd
 
Hot Rod Todd's Avatar
 
Join Date: Oct 2002
Location: Robins, IA
Posts: 1,075
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Mick Reeves over in Britain has a 6" Spinner made for his 1/4 scale Spitfire. With shipping to the US it's about $100. Dave Brown Mustang spinner would be cheaper, but I think I'll take a chance and check out the one from Mick Reeves that appears to have a better profile for the Mk.XIV..

I'll post some photos and let you know how it works out when I get it.
Attached Thumbnails
Click image for larger version

Name:	spins_2014.jpg
Views:	57
Size:	18.8 KB
ID:	2241547  
Hot Rod Todd is offline  
Reply With Quote
Old 10-18-2017, 09:12 AM
  #58
Shaun Evans
 
Shaun Evans's Avatar
 
Join Date: Jan 2002
Location: San Diego, CA
Posts: 7,076
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Hi

Is this a polyester or epoxy cowl?
Shaun Evans is offline  
Reply With Quote
Old 10-19-2017, 03:00 AM
  #59
OldScaleGuy
 
OldScaleGuy's Avatar
 
Join Date: Dec 2005
Location: Seymour, IN
Posts: 2,806
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

How is the spinner to cowl fit on this Spitfire? I have had two Phoenix planes and in both cases it appeared they added thrust to the engine mounting but did not account for the offsets in the cowl plug/mold. Therefore, i could not get a nice consistent fit between the cowl and spinner.
OldScaleGuy is offline  
Reply With Quote
Old 10-19-2017, 03:03 AM
  #60
Shaun Evans
 
Shaun Evans's Avatar
 
Join Date: Jan 2002
Location: San Diego, CA
Posts: 7,076
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Hi,

So I had a little stroke of luck the other day! Went to the flying field to maiden this bird, and had two very nice flights, including one with my 12-year-old son on the cord. With the cowl on, the engine temps (at least according to telemetry) were 100 degrees hotter than the hottest run-up on the ground without the cowl. I was getting up to 355 in the air, which I think is too hot for the DLE 55RA.

The 'luck' part was that a week-long 3-D event had just closed down at the field and none other than Colton Clark was there. He and several others of the best RC pilots in the US were clapping for my maiden landing, so I went over and asked them about engine temps. Colton went over to my plane, got down on the ground and drew out his suggestions for cooling mods onto the cowl with a sharpie. I followed his suggestions exactly and now I'm getting temps that are only 20-25 degrees higher than without the cowl. Gotta love it when the champs and real pros 'give back.'

Shaun Evans is offline  
Reply With Quote
Old 10-19-2017, 03:04 AM
  #61
Shaun Evans
 
Shaun Evans's Avatar
 
Join Date: Jan 2002
Location: San Diego, CA
Posts: 7,076
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Quote:
Originally Posted by OldScaleGuy View Post
How is the spinner to cowl fit on this Spitfire? I have had two Phoenix planes and in both cases it appeared they added thrust to the engine mounting but did not account for the offsets in the cowl plug/mold. Therefore, i could not get a nice consistent fit between the cowl and spinner.

Hi,

It's pretty good, actually.
Shaun Evans is offline  
Reply With Quote
Old 10-19-2017, 03:07 AM
  #62
OldScaleGuy
 
OldScaleGuy's Avatar
 
Join Date: Dec 2005
Location: Seymour, IN
Posts: 2,806
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

That is good to know. Thank you!
OldScaleGuy is offline  
Reply With Quote
Old 10-19-2017, 04:31 AM
  #63
SWORDSN
 
Join Date: Jun 2004
Location: WILLIAMSTON, SC
Posts: 1,068
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Quote:
Originally Posted by Shaun Evans View Post
Hi,

So I had a little stroke of luck the other day! Went to the flying field to maiden this bird, and had two very nice flights, including one with my 12-year-old son on the cord. With the cowl on, the engine temps (at least according to telemetry) were 100 degrees hotter than the hottest run-up on the ground without the cowl. I was getting up to 355 in the air, which I think is too hot for the DLE 55RA.

The 'luck' part was that a week-long 3-D event had just closed down at the field and none other than Colton Clark was there. He and several others of the best RC pilots in the US were clapping for my maiden landing, so I went over and asked them about engine temps. Colton went over to my plane, got down on the ground and drew out his suggestions for cooling mods onto the cowl with a sharpie. I followed his suggestions exactly and now I'm getting temps that are only 20-25 degrees higher than without the cowl. Gotta love it when the champs and real pros 'give back.'

Please outline his suggestions,it would apply to any narrow cowl installation.Thanks
SWORDSN is offline  
Reply With Quote
Old 10-19-2017, 04:39 AM
  #64
Hot Rod Todd
 
Hot Rod Todd's Avatar
 
Join Date: Oct 2002
Location: Robins, IA
Posts: 1,075
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

The were thinking ahead and made an opening in the firewall that allows cooling air to pass, trouble is if you leave the scoop as is on the bottom there's no place for the air to get out. I plan on cutting air outlets in the back of the scoop to help the cause. Also, many tend to cut the exhaust outlet holes as tight as they can. Making them larger is another path for the air to get out.. For inlet I'm sure it would help to cut out some in front of the cylinder, that way you're exposing more of the cooling fins. The DLE-55RA has larger cooling fins than the DLE-61, so it will be even harder to keep the 61 cool. That tightly trimmed cowl never looks good after a poor engine out landing due to overheating.
Hot Rod Todd is offline  
Reply With Quote
Old 10-19-2017, 01:28 PM
  #65
radfordc
 
radfordc's Avatar
 
Join Date: Apr 2005
Location: Lansing, KS
Posts: 1,557
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Smile

Quote:
Originally Posted by Shaun Evans View Post
Colton went over to my plane, got down on the ground and drew out his suggestions for cooling mods onto the cowl with a sharpie. I followed his suggestions exactly and now I'm getting temps that are only 20-25 degrees higher than without the cowl. Gotta love it when the champs and real pros 'give back.'

And now you're going to share with us?
radfordc is offline  
Reply With Quote
Old 10-19-2017, 03:02 PM
  #66
Shaun Evans
 
Shaun Evans's Avatar
 
Join Date: Jan 2002
Location: San Diego, CA
Posts: 7,076
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Hi,

It's all pretty much standard stuff, but what was cool was that a guy as talented as Colton was eyeing my particular setup and giving me a 'custom' recommendation. He drew the little 'smiley-face' opening under the spinner. He suggested I close off the opening in the scoop and instead open up a teardrop-shaped hole behind the scoop opening AND build some sort of ramp at the leading edge of that hole. He suggested that instead of finding some kind of triangle stock, I could just heat up and bend the glass itself. That's what I did after cutting two slots which made a 'flap' of glass in front of the hole. The ramp creates low pressure and sucks out the hot air. The smiley-face inlet lets the cool air in and onto more of the engine than just the top of the fins that stick out of the cowl.
Attached Thumbnails
Click image for larger version

Name:	20171021_113721_resized.jpg
Views:	52
Size:	716.2 KB
ID:	2241961   Click image for larger version

Name:	20171021_145752_resized.jpg
Views:	54
Size:	770.6 KB
ID:	2241962   Click image for larger version

Name:	20171021_145805_resized.jpg
Views:	46
Size:	893.2 KB
ID:	2241963   Click image for larger version

Name:	20171021_145815_resized.jpg
Views:	56
Size:	1.01 MB
ID:	2241964  

Last edited by Shaun Evans; 10-22-2017 at 03:04 AM.
Shaun Evans is offline  
Reply With Quote
Old 10-19-2017, 04:54 PM
  #67
toothepick
 
Join Date: Apr 2005
Location: , OH
Posts: 5
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Hot Rod Todd,
I have the 6" spinner from Mick Reeves. The profile is just ok, but the backplate is only 1/8 thick. I would not put this spinner on a plane with the backplate that comes with it.
I was planning to have a local machine shop mill a new backplate to fit the spinner.
Ziroli has a nice 6" P-51 spinner with a machined backplate that is more stout than the Reeves.
Precision Cut Kits list a 6" spinner for their Don Smith 1/4 Spitfire but I have not seen it or know who makes it.
Hope this helps.
Tim
toothepick is offline  
Reply With Quote
Old 10-22-2017, 06:42 AM
  #68
Shaun Evans
 
Shaun Evans's Avatar
 
Join Date: Jan 2002
Location: San Diego, CA
Posts: 7,076
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Added pics (thanks, Todd!)
Shaun Evans is offline  
Reply With Quote
Old 10-22-2017, 08:22 AM
  #69
Shaun Evans
 
Shaun Evans's Avatar
 
Join Date: Jan 2002
Location: San Diego, CA
Posts: 7,076
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Shaun Evans is offline  
Reply With Quote
Old 10-22-2017, 10:19 AM
  #70
radfordc
 
radfordc's Avatar
 
Join Date: Apr 2005
Location: Lansing, KS
Posts: 1,557
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Looks like the DLE-55RA does a good enough job. I was debating on getting a DLE-61 but will go ahead with the 55RA I have and see if that suits me. Nice flying.
radfordc is offline  
Reply With Quote
Old 10-22-2017, 10:34 AM
  #71
OldScaleGuy
 
OldScaleGuy's Avatar
 
Join Date: Dec 2005
Location: Seymour, IN
Posts: 2,806
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Not to change the subject but i can't imagine that the 61 has that much more power than a 55RA. My 55RA is a power house.
OldScaleGuy is offline  
Reply With Quote
Old 10-25-2017, 04:56 AM
  #72
Hot Rod Todd
 
Hot Rod Todd's Avatar
 
Join Date: Oct 2002
Location: Robins, IA
Posts: 1,075
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

I went with the 61, hoping that it can pull a 23" prop that will pull the big Spitfire around a bit better. Besides a bit more displacement the 61 has a 10.5:1 compression ratio compared to 7.6:1 for the 55RA (If you believe the specs).

Got my Best Pilots Sailor Malan pilot in the mail. At 1:5 scale he's a bit small, but the cockpit is quite shallow compared to the real thing. The fit looks decent, and his body fits well sitting on the shallow floor. I was also able to coax the instrument panel out. It's glued in with silicone, so it takes some patience and work to get it out. Since I'm scaling this thing out, I might as well put some extra time in the cockpit. Here are a couple photos showing Sailor during some fitting tests.
Attached Thumbnails
Click image for larger version

Name:	IMG_0669.JPG
Views:	43
Size:	296.6 KB
ID:	2242341   Click image for larger version

Name:	IMG_0670.JPG
Views:	42
Size:	335.4 KB
ID:	2242342   Click image for larger version

Name:	IMG_0671.JPG
Views:	35
Size:	370.8 KB
ID:	2242343  
Hot Rod Todd is offline  
Reply With Quote
Old 10-25-2017, 04:49 PM
  #73
Shaun Evans
 
Shaun Evans's Avatar
 
Join Date: Jan 2002
Location: San Diego, CA
Posts: 7,076
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Hi Guys,

So I had a couple of prop-strikes the other day when one of my mains collapsed (which they'll do even at 80 psi, apparently). I was using Xoar wood. How likely is it that my shaft is bent? What's the best way to check?
Shaun Evans is offline  
Reply With Quote
Old 10-25-2017, 07:06 PM
  #74
radfordc
 
radfordc's Avatar
 
Join Date: Apr 2005
Location: Lansing, KS
Posts: 1,557
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

If prop strikes caused bent cranks in DLE engines I would likely know. I should buy stock in a propeller company I've broken so many. The joke in my club is "there's another $20 landing!" And, no I've never seen any evidence of a problem with the engine.

Now the old Zenoah G-38...you could look at it wrong and the crank would bend.
radfordc is offline  
Reply With Quote
Old 10-26-2017, 04:57 AM
  #75
SWORDSN
 
Join Date: Jun 2004
Location: WILLIAMSTON, SC
Posts: 1,068
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

If the strike was on grass you are probably OK. You should be able to see wobble at low to med throttle setting.
SWORDSN is offline  
Reply With Quote
Reply


Thread Tools
Search this Thread
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -8. The time now is 01:32 AM.