JoeEagle

My Feedback: (26)

HI Guys:

Just updated the website while I'm here at Toledo.

The big news for us is that we are now making a Constant Speed Prop
for the Warbirdpropdrives.com Reduction Drive.

Check us out at www.warbirdpropdrives.com

cheers

Joe

JoeEagle

My Feedback: (26)

oops, forgot the picture

cheers.

Joe

-Fast-Eddie

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I saw those today!! ... i'll have to stop by the both again tomorrow to ask some questions

Rayden

Still wondering how your gonna cool it ??

exeter_acres

My Feedback: (2)

I took a look at that yesterday...very nice workmanship

CarverTripp

Hello Joe, So that was the surprise! Constant velocity prop, very nice. As you know I've been following your progress for some time now, and I must say it's looking great! One thing I would like to know, how much extra weight is the propdrive and hub assembly going to add to the nose?
Good luck in Toledo,
Carver

dionysusbacchus

My Feedback: (25)

Joe, Two questions, how does an engine that tight in a cowl keep cool? Will you ever make a prop that resembles a Corsair set up in the 3 blade 26" range?

Thanks

Dion

grinder-RCU

My Feedback: (1)

Pic from Toledo. Joe Doing his thing working the crowd. Very impressive looking craftmanship.

Grinder.

JoeEagle

My Feedback: (26)

Yikes!!

good thing that picture didnt focus on my gut...gotta slim down.

anyhow, the weight is on the documents posted on the website (i think) but,

Drive= 53oz
prophub/blades=29oz
yes, i need to lose weight and do does the drive.

as for cooling, here are 3 factors.

1. the nominal prop speed unless you are flying with your hair on fire is 2600 RPM. this equates to 6700 RPM (i think i said 5200 at the show, i was thinking 2:1 ratio). this is quite a bit less than the max rpm of the motor in flight normally, so there should be less heat.
2. The muffler from Keleo Creations is a huge heat sink, and dissapates a lot of heat. its T-6 aluminium, and is an efficient heat transfer mechanism, so that will help
3. there is a lot of unused real estate under the cowl where a cylinder head normally sits. it is a perfect place to put some baffling, so, just like on a full size plane, i expect that some baffling will be required.

it will be a challange, not a show stopper.

as soon as i get the blades, i'll post a pic on the website and link it here on RCU. then i'll do some ground testing to make sure the system works, then go fly the big cap to prove that it works.

thanks to all who stopped by to say hello at the show.

it really was a lot of fun, and i almost have my voice back after talking non-stop for 3 days.

cheers

joe

oifvet23

My Feedback: (6)

yes but what will be the cost

JoeEagle

My Feedback: (26)

Hi guys.

the cost will be

Drive including big pulley, small pulley, flywheel, belt, side frame, rear frame
$300

Prop hub includling actuating mechanism, cap, and computer that runs it all
$375

Blades=$30 each

we have a 3 blade and 4 blade hub.

we also think (but haven't proven it yet) that this setup will be powerful enough to fly a 100" wingspan warbird. the pitch change is 40 degrees, and will likely run from 18 degrees of pitch to 45 degrees of pitch in flight. 45 degrees equals about 48" of pitch. plenty of speed there!!

gotta go give a briefing!

joe

mugenkidd

My Feedback: (94)

The price is right. I think those numbers are very resonable. BTW will this hub be able to take a standard P-51 spinner or will you guys have to design a special one?

The hobby has needed this for a long time, please keep up the good work and keep us posted.

Michael

JoeEagle

My Feedback: (26)

Hi:

Just finishing my meetings in Washington, DC.

No, I don't think that anyone has a spinner that will fit this prop/hub.
Yes, we are going to come out with a spinner that will be for our prop/hub combo. We are planning of making it out of composites.

hmm...should i raise the price?? Seriously, we took a stab at resonable and waaaay too much.

Hopefully, this will work out for a bunch of folks.

I am trying to arrange my schedule to make it to Joe Nall. Don't know if it would be flying or just on display.

and yes, i think this thread should stick to the CF bryon blades, i was just trying to answer a question.

I heard that byron had blades at Toledo, but i barely got out of my booth.

Did anyone see them at the show?

JoeEagle

My Feedback: (26)

oops, i thought this was the byron thread.

by all means, this should be the WPD thread!!!!

thanks for all of your interest.

cheers

joe

www.warbirdpropdrives.com

YAT-28E

when is toledo??

ezflyr

My Feedback: (32)

Joe,

You say "Constant Speed", so I assume that means some sort of propeller govenor, or do really mean "Adjustable Pitch"?

Thanks!

John

PS Toledo was LAST weekend [X(]

mugenkidd

My Feedback: (94)

NO PLEASE NO Thanks for keeping the price resonable, this is definately in my price range.

BTW Without a spinner this setup looks Perfect for an 80in plus P-47 like the top-flight or Yellow, and better yet the P-47 would allow more cooling and probally balance better because radial planes usually need nose weight anyway, I wish Top Flight would release the giant ARF P-47 in time for this. Speaking of release time whats the estimate on having these available?

Michael

TLH101

My Feedback: (90)

Has anybody considered that if this drive weighs 53oz, it will take at least an additional 24oz at the rear to balance a T/F mustang ARF. Now if you add the total of the drive and the balance weight together, that's over 4 3/4 lbs total added weight, and that does not include the hub and blades.
Suddenly a 21lb plane weighs 26lbs. Now how will it fly?
I think this a great unit and think there are tons of applications for it but not and 80-85" aircraft. it will however be a boom for the larger birds, especially the those with round engines that need a ton of balance weight.

t_burley

My Feedback: (59)

exactly Terry, I was kinda thinking along the same lines. I like the idea of what Joe is doing here.
I can see having a nice FW190A8, short nose German fighter, all decked out, flying scale prop, and
of course all the "correct" markings including swastikas to make it look the part.

with the short nose, all that weight up front would be great.

also the Hellcat, Typhoon, Zero etc would benefit

mugenkidd

My Feedback: (94)

Like a warbird is supposed to. If I recall several byron mustangs weighed in at least that much and they are the same size as the TF one, for the true scale mustang lover the extra weight will not be a major problem. Even with the reduction drive I don't think the wing loading will be as high as many scale turbine jets. Also just because its designed around the mustang doesn't mean it wouldn't be great in other birds, a big 4 blade will look great in several planes P-47, corsair, bearcat, and skyraider just to name a few that would be on my list.

Build it and we will buy.....

RickVB

My Feedback: (24)

I hate to rain on everyone's parade here, but I am still coming back to what I asked when Joe posted the prototype what, two years ago... how is this gonna get cooled? I know Joe addressed this above, but I still have extreme difficulty believing that this is going to work. The hottest parts (the head and the exhaust manifold) are in the top of the cowl, where there is the absolute least airflow with this setup. Unless there is room on the sides (and it sure doesn't look like it), with the prop hub and drive gear on the top front and the main drive gear and flywheel behind the bottom front, there's no way in there, and the mount frame is behind that, anyway. On top of that, ducting out through the fuse seems to me to be absolutely manditory, as there's no way your going to get enough air down the back past the carb to go out the bottom, the only other option being to make the exhaust slots in the cowl a lot taller in the back.

I seems to me that I read someone (was it RCShowcase/ZDZ?) who was talking about bringing out water cooled versions of some of their singles. This would seem to be a prime candidate.

I also agree that this drive might be better suited for larger planes that the TF Mustang, but because they would have larger cowls with more room to work out the cooling. I also agree this would be great for the big radial engined planes, but I think it would be advisable to come out with a few longer lengths of prop hubs (different between the drive gear and the blade mounts)to get the drive back out of sight more (to fit a dummy radial).

Joe, since you've apparently got the Eagle Tree Systems telemetry equipment, I think that when you fly your prototype it would be a good idea to put temperature sensors on the top engine area in a few places and collect some data. That would settle this once and for all, I'd think.

Don't get me wrong, I'm as anxious as anyone to see this work (if it does, your guaranteed to sell a few to me ). I'd just hate to see the project get 95% of the way there, and then stop short of perfect. We all appreciate your efforts, Joe.

grinder-RCU

My Feedback: (1)

I didn't talk to any of the Byron guys, but was able just to snap an pic of the drive unit.

Grinder.

oifvet23

My Feedback: (6)

hey rickvb,
did i hear you say something about liquid cooled engines??? tell us more

MetalWarbirds

My Feedback: (1)

Hi Joe,

If you ever want to try it on a P-51D with 111" wingspan, give me a call . We're currently flying it on a G-62.

JoeEagle

My Feedback: (26)

Hi guys,

here are some answers to your questions until i get a FAQ page on the website

yes, its constant speed-governor by ModelAvionics

yes, on board telemetry will answer the question about heat buildup. i can tell you from personal experience when i was testing the 2G drive and 3G drive last year on the 1/3 H9 232 Cap, i had the cylinder head temp up to 280F, but by the time i taxied in it was around 210F. huge difference in the air vs on the ground, where we typically check our temps.

the weight fraction of the drive/prophub/propblades/muffler on the TF-P51 is a larger percentage than say, a Ziroli 90 inch bird or larger. so is the cost fraction.

in other words, i picked the TF mustang because i like it and it was readily available, now it is up to me to make it work.

as for performance, i got over 85mph with a fixed pitch 26x24 3 blade prop on my old design drive last year. i'm not worried about the performance on a 25 or 26# plane. or a 36# plane for that matter


guys, i'll answer more after i get home tomorrow.

going out to fly a trip for work. the OTHER day job.

cheers, and thanks for your continued interest.


joe