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All Forums >> RC Airplanes >> RC Jets >> RE: YA Skyhawk and Wren 44 Gold Perfect together
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RE: YA Skyhawk and Wren 44 Gold Perfect together - 10/8/2012 12:16 PM   
Dr Honda



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From: Latrobe, PA, USA
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quote:

ORIGINAL: Mark 5

Tony, congratulations on your maiden. You are right, the Wren 44 Gold is a great little turbine, I just wish that I could squeeze a little more power out of it for taking off of my grass field (thick sod). Do you have any video? Mark



Nope... didn't get any vids of the maiden. I wish I would have... it flew very well. All I have is pics of it sitting around... but here it is. (I'll get a flying vid next time out)











quote:

ORIGINAL: yeahbaby


hopefully Santa's Lil Helper will put in a good word for me with Jolly Saint Nick.


cheers






I have 2 small kids (6 years, and 18 mo) So the "Fat Man" funds normally have to go to them. But who knows... maybe I can convince him to bring me some new toys too. If Jet Munt gets their M-35 done... I will have to beg. I'm really liking these small engines... but a p-20 is too small, and the Kolibri's are TOO expensive. (in the USA)


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RE: YA Skyhawk and Wren 44 Gold Perfect together - 10/8/2012 1:23 PM   
Mark 5


 

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Status: offline 		Yeahbaby, you will love this combination! It is lighter than the OS91 Dynamax,more powerfull,more dependable and sounds great Mark

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RE: YA Skyhawk and Wren 44 Gold Perfect together - 10/8/2012 3:27 PM   
yeahbaby



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From: FT Worth, TX, USA
Status: online 		I'm glad to hear the 44 performs well.. I flew my previous one with a P60 and it flew great but the AUW was just a bit much for the gear structure. I've been pawing the ground ever since to do it with the 44.

congrats again.

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RE: YA Skyhawk and Wren 44 Gold Perfect together - 10/8/2012 4:04 PM   
Bob_B



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Status: offline 		Buck crack that wallet open and buy that motor!

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RE: YA Skyhawk and Wren 44 Gold Perfect together - 10/8/2012 5:19 PM   
yeahbaby



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Status: online 		hahaha I'm hoping I can sweet talk Mrs Claus first.

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RE: YA Skyhawk and Wren 44 Gold Perfect together - 1/30/2013 12:16 AM   
Mark 5


 

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Status: offline 		Art, how is the A-4 comming along?

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RE: YA Skyhawk and Wren 44 Gold Perfect together - 1/30/2013 2:36 PM   
Art ARRO


 

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Status: offline 		Mark,
It's coming, but currently at the end of the line for my winter projects.  Just last night I found a set of A-4 inlets that BVM made for me.  These will advance the project as the original inlets were shaped from balsa sheeting.  It took several attempts to find the right balsa and curve it to and nice inlet. without splitting.

What tailpipe are you running in yours?  I was planning on Wren to make up one of their boosted tailpipes, but with a double wall. What's the length of your tailpipe-approx)? Thanks.

Art ARRO



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RE: YA Skyhawk and Wren 44 Gold Perfect together - 2/1/2013 3:14 PM   
Mark 5


 

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Status: offline 		Art, my pipe is double walled and is 24" long. It keeps the fuselage very cool. My friend Tino from M.D. built it. It does not have any thrust loss, however if you can get 1/2 pound more thrust with the wren pipe I would recommend it. With small jets 1/4 or 1/2 pound thrust make a noticable diffrence.

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RE: YA Skyhawk and Wren 44 Gold Perfect together - 2/1/2013 10:51 PM   
Art ARRO


 

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Mark,
Thanks for the length of your tailpipe for the Yellow A-4.  I did a quick measurement of that length on the hulk of my old BVM A-4 and it looks about right.  The turbine nozzle would be about an inch forward of this and it puts the mounts right about where the Turbax sat.  I'll speak with Ron B. on getting an augmented pipe made up for the 44.
Also, what is your tank setup?  I figure I can use 2 Sullivan DF-11's in a saddle position with a SS-16 up front in the crotch of the inlets.  Let me know on this.  Thanks in advance.

Art ARRO



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RE: YA Skyhawk and Wren 44 Gold Perfect together - 2/4/2013 4:43 AM   
Mark 5


 

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Status: offline 		Art, look at the first page of this post, you will see a few pictures of my tank setup. I have two 10 oz tanks on the floor and two 8 oz tanks on either side of the turbine.

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RE: YA Skyhawk and Wren 44 Gold Perfect together - 2/4/2013 5:40 PM   
Art ARRO


 

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Status: offline 		Mark,
I did go back to your early post and noted the tank setup.  I like the idea of the tanks clustered about the CG.  My old DF version just had a SS-16 installed in the crotch of the inlets which resulted in a nose heavy takeoff and gradual shift to the rear after fuel burn for landing.  I have enough of the hulk to make some fit measurements with DF-11 saddle tanks, and perhaps a 16 oz vee-shaped boat tank beneath the 44K, all centered about the CG.  Mine will be a one-peice jet to save weight.

Art ARRO

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RE: YA Skyhawk and Wren 44 Gold Perfect together - 2/5/2013 2:40 PM   
Mark 5


 

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From: lincoln park, NJ, USA
Status: offline 		Shaun, I remember that you had a Skyhawk with a p-70 or a p-80. How did it preforme? What did it weigh? How did the landing gears hold up? Where did you locate all the fuel?

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RE: YA Skyhawk and Wren 44 Gold Perfect together - 2/5/2013 3:51 PM   
YellowAircraft



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Status: offline 		Hi,

I shoehorned a P-80 in one a while back. I carried 12 ounces in a header inside, and 47 ounces in a centerline tank. I could get 5 minutes with that since I wasn't drawing much at the throttle setting I had. Gear held up fine until I wrecked it!

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RE: YA Skyhawk and Wren 44 Gold Perfect together - 2/7/2013 2:43 AM   
Mark 5


 

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Status: offline 		Hi,Shaun, what did tha a-4 weigh and how did it fly with all that weight? It must have been a rocket with the p-80. Was it difficult to slow it down for landing?

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RE: YA Skyhawk and Wren 44 Gold Perfect together - 2/14/2013 1:01 AM   
Mark 5


 

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Status: offline 		Art, you must be very close to finishing your A-4. Let us know about your progress. Mark

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RE: YA Skyhawk and Wren 44 Gold Perfect together - 2/14/2013 5:28 PM   
Art ARRO


 

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Status: offline 		Mark,
The A-4 Skyhawk is next in line for building, right after I complete my modded Alfa MiG.  Note that this A-4 is from a very early BVM semi-kit, meaning it's halfway between a scratch/plans build and a normal kit.  Only the fuselage and wheel pods are molded fibreglass and all parts must be hand cut from sticky-back mylar templates.  The formers are composite; balsa laminated to 64th ply on both sides.  The wings and tail feathers are built-up rib/spar construction with balsa sheeting.  A lot of work involved just to fabricate the basic peices.
Note that ARF wasn't even a word back in the late 70s.  Remember "Hot Stuff", as the revolutionary new adhesive? Anyway, I've ordered the long lead time items and an augmented tailpipe is currently being made in the UK.  I figure it will be a mid-to-late season maiden on this A-4.
I'm also trying to keep it very light as my previous glow DF A-4 weighed less than 9 lbs-dry, even after a major rebuild due to a crash in a tree.  Will keep you posted on this.

Art ARRO


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RE: YA Skyhawk and Wren 44 Gold Perfect together - 5/15/2013 11:18 PM   
Mark 5


 

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Status: offline 		Another 5 flights today. I moved the CG back 1/4 inch and increased the elevator , aileron throws a little. I can now do an outside loop and I am able to slow down the A-4 for landing. I tried a few down wind full throttle passes and am surprised at how fast the Wren 44 gold pushes the A-4. The verticle is also good, all from a turbine the size of a Coke can.

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RE: YA Skyhawk and Wren 44 Gold Perfect together - 5/15/2013 11:43 PM   
yeahbaby



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Status: online 		so where is the CG now and measured from ???? I forget leading edge or trailing edge? I am looking at my little bird patiently waiting for a W44.

can't wait

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RE: YA Skyhawk and Wren 44 Gold Perfect together - 5/16/2013 2:15 AM   
Mark 5


 

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From: lincoln park, NJ, USA
Status: offline 		Hi Yeahbaby, The CG is 12 1/4 incher measured ftom the trailing edge of the wing. This helped to slow it down for landing , however I think it flew a little bit better with the CG at 121/2 inches from the trailing edge of the wing. This is one airplane that you do not want to fly tail heavey. It will snap at every opportunity.

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RE: YA Skyhawk and Wren 44 Gold Perfect together - 5/21/2013 3:07 AM   
Mark 5


 

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From: lincoln park, NJ, USA
Status: offline 		Yeahbaby, are you purchaseing a new Wren 44gold? Kingtech has a very small and light new turbine(K60) worth considering.


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RE: YA Skyhawk and Wren 44 Gold Perfect together - 5/21/2013 5:07 AM   
yeahbaby



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Status: online 		I'm thinking about it. I haven't done the comparison yet between engine weights but I can only assume the Wren 44 is the lightest among motors in it's class. I met Barry in Mississippi a few weeks ago and know that he backs a great product.

will look into the two motors a bit more when it comes time to choose.

congrats on a great looking and flying bird.

cheers

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RE: YA Skyhawk and Wren 44 Gold Perfect together - 5/21/2013 7:04 PM   
Mark 5


 

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Status: offline 		Art, how did you get your previous A-4 under 9LBS ? Were the wings glassed?

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