DR-1 (Sands): Builders Group - Page 43

Funfdekker · 1 March 2005, 12:54 PM

With regards to cooling a radial engine with the faceplate fitted, take a look at these NZ based machines.

http://www.warbirdz.net/searchhitsw.php?Srch=&page=3.
&
http://www.warbirdz.net/searchhitsw.php?Srch=&page=5
&
http://www.warbirdz.net/searchhitsw.php?Srch=&page=7

( Ive downloaded the pics but couldn't work out how to attach them here

)

By the way have you seen that Rotec are building a 150 hp 9 cy engine turning 84" prop at 1800 rpm

http://www.rotecradialengines.com/ne...newsletter.htm

BAPilot2 · 1 March 2005, 02:21 PM

I too am wondering if it is truly necessary to cut out the center of the cowling in order to cool the upper cylinders on a radial engine?

Has anyone tried cutting our the two "eye-hole" indentations on the cowl and then rigging make-shift cowl-flaps at the base of those deep recesses making, in effect, a venturi to channel ram-air pressure into the upper cowl for cooling these cylinders? Just a thought. I'm not even sure if there would be enough room to do such a thing. What do y'all think???

airfour · 2 March 2005, 07:20 AM

Quote:

Originally Posted by Funfdekker

With regards to cooling a radial engine with the faceplate fitted, take a look at these NZ based machines.

http://www.warbirdz.net/searchhitsw.php?Srch=&page=3.
&
http://www.warbirdz.net/searchhitsw.php?Srch=&page=5
&
http://www.warbirdz.net/searchhitsw.php?Srch=&page=7

( Ive downloaded the pics but couldn't work out how to attach them here

)
By the way have you seen that Rotec are building a 150 hp 9 cy engine turning 84" prop at 1800 rpm

http://www.rotecradialengines.com/ne...newsletter.htm

Yea, its kinda spendy though, I think.
Air

joepilot · 2 March 2005, 05:48 PM

Hey Maxim08

New guy, joepilot, here. I am buying Ron Sands' plans to be in my hand for my birthday in April. While I am researching, I was wondering about the Jacobs radial engine. I found your post while reading the thread. Does the "Shaky Jake" shake too much for the Dr. 1? Is the Jake too heavy? What modifications did you perform to fit a Jake? Why did you pick the Jake?

Lots of questions, I know. I appreciate your patience but I really want a radial to power my Dr. 1. Any suggestions?

Joepilot
check 6

greatwarpilot · 2 March 2005, 06:21 PM

Hello Joe Pilot,

If you are set on a radial to power your DRI there are a number of options out there. My museum has 2 DRIs; one powered by a Warner Scarab, and the other by a "Shaky Jake". Both are great engines in the airplane, although as I understand it are getting harder to find these days (The Warner in particular).

A number of people are looking to newer Russian Radials from the Venedeyev line (AI14s, M14Ps, etc) to power their Tripes. Definately more available (one on ebay right now http://cgi.ebay.com/ebaymotors/ws/eB...RK%3AMEWA%3AIT) and more affordable also.

Those are the three most common round engines I know of people using, unless they're lucky enough to have a rotary.

I'm sure others will suggest a few other options also.

Cheers

Ed

WinterHawke · 2 March 2005, 07:50 PM

Quote:

Originally Posted by BAPilot2

I too am wondering if it is truly necessary to cut out the center of the cowling in order to cool the upper cylinders on a radial engine?

Has anyone tried cutting our the two "eye-hole" indentations on the cowl and then rigging make-shift cowl-flaps at the base of those deep recesses making, in effect, a venturi to channel ram-air pressure into the upper cowl for cooling these cylinders? Just a thought. I'm not even sure if there would be enough room to do such a thing. What do y'all think???

Gentlemen,

An excellent example of a radial powered Triplane would be the ORA Triplane N220TP. I believe it is powered by the W-670 Continental 220 HP Radial, and it's cowling looks pretty good. I am currently modelling this plane specifically because of the cowling!

Photos of this plane show that the rear of the cowling is not flush with the fuselage - there is a subtle gap because the cowling is slightly wider than the fuse. This allows air to exit all around the cowling. As I understand it, getting air out of a cowling is the key.

The attached photo, courtesy of "Chevelle" over at RC Universe shows this to good effect, I believe.

Best regards,

Lee McDuffee
the WinterHawke

joepilot · 3 March 2005, 01:32 PM

Hey WinterHawke & Greatwarpilot.

Superb information. I too will have the traditional "eyeball" cowling and attempt to duct the air to cool the covered cylinders. I believe the idea of a subtle gap has potential. I am also looking at the Ausie's ROTEC radial engine. It is less than a Jake and weighs significantly less. I am also intrigued that it will turn a 78 inch prop. Any suggestions? This will bring in more of a true replica look. Great ideas and food for thought if you are hungry.

On a different note. I am mailing the check for the Ron Sand's plans tomorrow!

Although the family will not let me open it until my birthday in early April, I have taken that first step on the journey. My plan is to assemble & build the fuselage first. The original cockpit has intrigued me and my purpose is to build it as close as possible - given the FAA required stuff.

C'ya
check 6

Jim Bruton · 5 March 2005, 05:48 AM

JoePilot,

you do know that rotec has on the drawing board a 150hp? it might even work better, providing more power at lower rpms, hence longer, more original prop. also, the russian m-14 220hp is priced right, has good power in the similar rpm range, only it turns backwards, so you'll have to make your prop accordingly. i like the subtle design idea of venting the hot air thru a slightly open cowl on the backside.

jim bruton

Maxim08 · 5 March 2005, 09:09 AM

Joepilot,
78" prop? Original was 102" (2600mm). I believe that the Jake engined DR1 runs a 90 something inch prop currently. Pilot reports state 'easy to fly, good power and reasonable fuel economy'.
Maxim08

joepilot · 7 March 2005, 01:49 PM

Maxim08 & Jim,

Thanks for the head's up. From their web site, the ROTEC 110 hp w/o accessories runs about $13,000.

http://www.rotecradialengines.com/Ma...ting.htm#Price

I wonder what the 150 hp will go for? The big question is weight. What are some of the modifications required to mount the Jake to the Dr. 1 frame? Jim, I agree with the subtle venting idea. Whichever radial I purchase, I will work with the dealer on ideas to cool the beast.

Any ideas on beginning this massive project with the fuselage? Is Wicks Supply a good place to get the fuselage "pipes"? The price seemed reasonable and it appears to come with what is needed to build the frame.

Can't wait to get the plans.
Joepilot
check 6