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RE: Shrike 40 with thinner airfoil - 2/20/2013 1:52 AM   
combatpigg



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From: arlington, WA, USA
Status: offline 		Looks terrific..! Did you already have a set location fugured out for the engine before you got started..?


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RE: Shrike 40 with thinner airfoil - 2/20/2013 2:37 AM   
Speedy-Gonzales


 

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Status: offline 		Yes I did. My last Shrike with same engine required 2.5 ozs. of lead in the tail. Actually I just did some simple math to get my nose moment. I laid out my radio components on the airframe and it looks to be spot on. The K/B 6.5 is a very light engine and I can't see how some are installing 60's without shortening the nose moment. I would like to build one around the JETT 60 LX but that is more $$$$$$. If I would go that route I would switch to a SD delta if MJD would ever make some kits! Lots more potential for speed with the SD.

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RE: Shrike 40 with thinner airfoil - 2/20/2013 2:55 AM   
combatpigg



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Status: offline 		I think you can hit 170+ with the K&B.
My first K&B 6.5 was bought unused from a F1 pylon guy. I tried it with a tuned pipe, but it ran better with open header. It liked 7.2x8.6 APCs...it liked them so well that I never bothered looking for other props.
I don't know the history of this engine, but they are a great value compared to paying a high price for newer engines with less potential to be fast.
I remember taking so much weight out of the piston and rod that I had to remove some weight from the counterweight because of vibration. I just ground a half round 1/8" divit and on the first try the engine smoothed right out.


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RE: Shrike 40 with thinner airfoil - 2/20/2013 3:09 AM   
Rudeboy



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Status: offline 		That's one way to get rid of ballast: grind away at the piston and rod until the engine starts shaking your plane apart....then start grinding on the crank counterweight until it smoothes out again.
Then take some ballast out of the tail.

Heck, you win 3 times!
I love it

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RE: Shrike 40 with thinner airfoil - 2/20/2013 4:50 AM   
combatpigg



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Status: offline 		A machinist like Speedy would cringe to see the "milling" of the piston done "freehand"....
Remember to wind lots of duct tape around the piston before grinding away. I just pretend to be a dentist when doing that stuff..a very patient dentist with a fine tooth rotary file in a high speed die grinder. A flex shaft between the die grinder and the cutting tool would make that sort of work much easier, I'll bet.
Micro grams add up when a piston is going up and down 300-400 times per second.
Less weight takes a load off the crank pin. It's a pretty easy way to make a little bit of difference.
The other thing that would help is a hollow wrist pin...I can't remember if this engine has one or not.


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RE: Shrike 40 with thinner airfoil - 2/20/2013 4:28 PM   
iron eagel



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Status: online 		I had friends which did that sort of thing for full size engines for the cars they ran up at New England Drag-way in NH.

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RE: Shrike 40 with thinner airfoil - 2/20/2013 9:44 PM   
Speedy-Gonzales


 

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quote:

ORIGINAL: combatpigg

A machinist like Speedy would cringe to see the ''milling'' of the piston done ''freehand''....
Remember to wind lots of duct tape around the piston before grinding away. I just pretend to be a dentist when doing that stuff..a very patient dentist with a fine tooth rotary file in a high speed die grinder. A flex shaft between the die grinder and the cutting tool would make that sort of work much easier, I'll bet.
Micro grams add up when a piston is going up and down 300-400 times per second.
Less weight takes a load off the crank pin. It's a pretty easy way to make a little bit of difference.
The other thing that would help is a hollow wrist pin...I can't remember if this engine has one or not.


Not really..........even with the sophisticated CNC machinery of todays modern machine shop, the application of handwork ( benchwork ) is still very common. Especially for when cosmetics and blending are necessary. Sometimes a CNC machine can not replicate the art form of a steady hand on a die grinder with a keen eye.

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RE: Shrike 40 with thinner airfoil - 2/22/2013 1:24 AM   
Speedy-Gonzales


 

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Status: offline 		I have modded several K/B metrics and have found them to be excellent runners in their stock form.
I have also used the marine outboard high port sleeves in the 7.5's with great results. The K/B "Metrics"
were great little engines but the consistency of manufacture left a lot to be desired. Some were good and others
were lemons. Most made Clarence Lee to be an engine genius but in reality he was/is just a guy that new right
from wrong when opening up an engine. When K/B came out with the SR II 6.5cc "Quickee" they had a real winner but
the rules were changed to only allow side exhaust engines for Q500 so the K/B SR II 6.5cc Quickee lived a short life in the
spotlight.
I have actually found that the K/B SR II 6.5 will easily hold it's ground to a K/B 7.5 DF. Either way I buy them up whenever
available at a reasonable price because they are worth every dollar spent and I love placing fear in the "Big Boys"
with my cheap little K/B's!

It is getting hard to find affordable RE engines let alone RE engines period! Thus my love affair with K/B metric series engines.

SPEEDY-G

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RE: Shrike 40 with thinner airfoil - 2/22/2013 4:05 AM   
MJD



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Status: online 		I picked up two 7.5 RE DF engines off the classifieds a couple of years ago. I haven't run them yet .. need to order headers, no other excuse. I'll get to it, for now they're in the drawer ready for spring and the test stand at least. One has the billet front end and rear drum housing, the other cast parts. I'm sure one will end up on a Demon sometime soon. While there are engines like the OS .46 VR-DF with more power, I really like the form factor - they are narrow and compact for their displacement. Molding a dedicated fuselage profile around one with the right wing would make for a respectable sport speed design. I had a Matney AJ-2 Quarter Midget .15 kit in the shop for a while (traded it, but I sure wanted to get it done) and I used to hold the 7.5's against the fuselage to visualize the mutation.. I was sure it would work at the time. They have 350 sq in of wing so why not.

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RE: Shrike 40 with thinner airfoil - 4/4/2013 2:06 AM   
Speedy-Gonzales


 

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Status: offline 		Never say "Never"! I am applying silk and dope as of this evening. Should have it covered this week.
No paint.....just covered.

Going to the TOLEDO R/C Expo on Saturday. There goes another paycheck!!

TOLEDO has been a yearly tradition for my dad and I for the last 35 years.

We go mainly for the day together and I buy glowfuel without paying hazmat fees and batteries.

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RE: Shrike 40 with thinner airfoil - 5/25/2013 2:27 AM   
Speedy-Gonzales


 

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Status: offline 		My Dad had a bad stroke on May 2nd. All my building is on hold.
He won't be launching for me anymore.

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RE: Shrike 40 with thinner airfoil - 5/25/2013 2:54 AM   
combatpigg



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Status: offline 		Oh so sorry to hear about your Dad. My thoughts are with both him and you for a good out come.


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RE: Shrike 40 with thinner airfoil - 5/25/2013 3:11 AM   
Speedy-Gonzales


 

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Status: offline 		Thanks so much for your sincerity CBP.

Sometimes life is beyond our control and that sucks.

I am fortunate to have so many memories with my Dad.

He is a hard ass Marine and a Korean War Veteran so he knows how to fight.

This will be the battle of his life and I am willing to put my life on hold to stand by his side.

I will still find time to go flying with what I have ready to go but building is on "hold".

Thanks once again.

Dennis L. Wann ( aka "Speedy-Gonzales" )

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RE: Shrike 40 with thinner airfoil - 5/25/2013 5:35 PM   
iron eagel



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Status: online 		Sorry to hear about your dad, my best wishes for his recovery.

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RE: Shrike 40 with thinner airfoil - 5/25/2013 9:22 PM   
Speedy-Gonzales


 

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Status: offline 		Iron Eagle,

Thank you. Father/Son teams in modeling are becoming uncommon.

I have been blessed. Not only are we a team in modeling but also in fishing, drag racing, hunting.

We have much to sit and remember together. Many stories to tell and share and laugh about. Most good.

Give your fathers a hug every chance you get while they are alive and never be afraid to tell someone you love them.

As a man.....NEVER feel weak by showing emotion. Emotion comes from the heart and soul.

I am not looking for sympathy but I do sincerely appreciate all your well wishes.

Thanks again!

SPEEDY-G



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