I am Baaack

[crispy critter]

Re: I am Baaack

One thing you need to watch on the 8E/F etc exhaust is that this exhaust is set up for a C85,C90,or 0200. I think the 65hp luscombe exhaust is completely different and I'm not sure if the luscombe exhaust I used (for the 85 & up hp)will work on an A65/75 due to cylinder spacing. I've heard some folk say the cylinder spacing for the exhaust is the same on A65 thru 0200,and I've heard some folk say there not, I personally don't know but I think there is a minor difference. If anyone is planning to use them on an A65 you want to check to make sure they will work.

[crispy critter]

Re: I am Baaack

Thanks Kevin. Yup the Luscombe exhaust seems to be the way to go. Thanks for the heads up on the Gasculator location. Thats interesting that the 74/45 works well with the 0-200 on the T. I will let you know something on the prop when appropriate . Robert Lees reports great things on the Stroker with a 70/48 and Tom mentioned a C-90 clip using a 69/50 with a clip wing out there in Illinois.Well now that those numbers are in

I turn now to a Carb question. Robert has the stroker so he knows what he is using on that set up. Soo Robert with the Stroker were you able to stay with a Strom or did you go to the Marv? You are still certified I will not be so was thinking about the Ellison Injection...again clue less in SC !!

Thanks again all . Its great to be learning again !!

When we test flew Crispy we were running an 0200 on a short mount with no electrics. Standard long wing t-craft with an empty wt of 735lbs. We were using a McCauley 74/45 prop. Static was right on the numbers,about 2350-2400 on climb out in mid July heat & humidity in east Ky. Numbers were as follows with 24 gallons gas and one person at 250lbs. Airport elev was 924.
Climb @ 70mph= 1000-1200fpm
Climb @ 80mph= 900-1100fpm
Climb @ 90mph= 600-800fpm
Cruise @ 2200rpm= 115mph
Cruise @ 2300rpm= 120mph
Cruise @ 2400rpm= 125mph
These speeds were also checked with a GPS and were about 2-4 mph slow....the GPS showed us doing about 2-4mph faster then these numbers! At 2500rpms the GPS was showing us at 134mph with no wind and the airspeed indicater was showing 130mph. Of course you want to pull the throttle way back in bumpy air,but in smooth air she would out run our 170B pretty bad. We did try other props before going with this one. First we tried a standard prop for an F19 and it sucked,nothing did what we wanted....then we tried a 73/43 McCauley which had the tips cut down just a little bit on the corners and it wasn't hardly enough prop but was real close. Then we tried a 72/48 McCauley(cruise prop from a BC12D-85) and it seemed to have the engine under a constant load and didn't give us the climb numbers we thought we should have plus 2500rpms was all it would do with the throttle on the firewall in level cruise. We wasn't sure which way to go from there,the 73/43 had done the best so far and we really thought if we had that prop without the cut tips that it would do really well.... and then dad said we should try the 74/45 McCauley. I thought he was nuts,a standard prop for an A65 t-craft on an 0200???? I honestly thought it would be worse then the 72/48......but it was perfect!!! Best climb of any prop we tried yet,best cruise numbers of any prop yet,and it didn't seem to load the engine up or let it easily overspeed. This is also the best all around pitch prop I've ever used on 65hp t-craft too.....I guess it's just a good t-craft prop all the way around.

[Robert Lees]

Re: I am Baaack

One thing you need to watch on the 8E/F etc exhaust is that this exhaust is set up for a C85,C90,or 0200. I think the 65hp luscombe exhaust is completely different and I'm not sure if the luscombe exhaust I used (for the 85 & up hp)will work on an A65/75 due to cylinder spacing. I've heard some folk say the cylinder spacing for the exhaust is the same on A65 thru 0200,and I've heard some folk say there not, I personally don't know but I think there is a minor difference. If anyone is planning to use them on an A65 you want to check to make sure they will work.

You are correct. The fore/aft spacing on each side (bank) is the same, but there is about a 3/8 difference between the bank on one side & that on the other (i.e. left & right sides).

Before I installed the 85, I took the existing A65 exhaust and the engine to my local welder and said "Make it fit". He had to put in a little piece down the "back straight" to get it to work.

[crispy critter]

Re: I am Baaack

If the fore and aft spacing is the same then the Luscombe 8E/F exchaust should work with no problem because the exhaust stacks are seperate from right & left sides. I.E. there is no interconnect pipe between the right & left sides.

[flyguy]

Re: I am Baaack

I have a stock Luscombe header (fairly new) on the right side of my 85 and it fits perfect.

Kevin, does that mean that if I could spin a 7445 at 2200 on my -85 that it would go 115 (cruise?) How did you get a STC on a 74 incher without doing vibration analysis and all that kind of stuff (or maybe you did that?)

Darryl

[swoeric]

Re: I am Baaack

This has really been a great thread as I have been looking at the stroker idea my self. Has anybody found the highest compression that can be run in an 85 and still run premium 91 octane auto gas? How does the IA know that the exhaust is a certified exhaust and not something that was created for the plane? Also would extending one of the legs so that it exited in the area of the stock exhaust leaving the cowl intact be considered a repair? Has anybody used modern coatings on intakes and exhaust for heat control? finally along the line of the ellison unit does anybody have experience with this?

[crispy critter]

Re: I am Baaack

I have a stock Luscombe header (fairly new) on the right side of my 85 and it fits perfect.

Kevin, does that mean that if I could spin a 7445 at 2200 on my -85 that it would go 115 (cruise?) How did you get a STC on a 74 incher without doing vibration analysis and all that kind of stuff (or maybe you did that?)

Darryl

Darryl,
I had to enlist the help of a DER/DAR engineer but the prop had previously been approved on other aircraft with the engine but not on a taylorcraft. It met all the static test,tracking test,etc. The prop was not too hard to get approval on but it took a while on the engine and I'm still hoping to get approval for light wt starter & alt. As for what your airplane will do????? It has a lot more to do with how clean it is your airplane is,how straight it is,and most importanly....how well it is rigged. I can take a stock t-craft with a good A65 and a straight airframe and just by spending a few minutes adjusting the rigging I can unsually change the cruise speed by 5-10mph depending on the prop your running(sometimes more). I bought an old t-craft once that had a standard wood propon it, dusty & dirty from setting in a pole hanger for a while, etc. I flew it home with a cruise speed of about 85-90mph at 2150rpm's. After a good hand wash bath,and some rigging adjustments I brought it up to 95-100mph. Then I put a McCauley 74/45(standard pitch metal t-craft prop) on it was scooting along at 110-115mph at the same 2150rpm's. So there are many factor s to speed & performance. Most of the time if you rig it to gain that much speed your going to loose noticable climb performance. It just depends on what best suits your needs. Most t-crafts have the ability to cruise with an older C172 on 65hp. You said you have 85hp,the 72/48 McCauley that I tried on Crispy was a cruise prop that I removed from a BC12D-85 because the guy who bought it wanted a climb prop. It would cruise about 115-120 at 2350rpm's and would climb about 700-800fpm at gross. The only thing the climb prop did that I could tell was got off the ground about 50' sooner and slowed the cruise to about 100-105mph. It really didn't change the rate of climb at gross wt. However each airplane is a little different in thier own way and you will not always get the same results.

[N96337]

Re: I am Baaack

the 72/48 McCauley that I tried on Crispy was a cruise prop that I removed from a BC12D-85 because the guy who bought it wanted a climb prop. It would cruise about 115-120 at 2350rpm's and would climb about 700-800fpm at gross.

Kevin, that's right where I was with an 85, short mount and the same prop. We planned 115 and got it. It was ok on bare ground for takeoff, but when the snow hit, I had to take the pitch way back to get off the ground in any sort of reasonable distance.
Swoeric, I've used Evershield for heat control a lot of times...it's awesome!

http://www.stewartsystems.aero/catalog/6c45c7bf-4597-4ab4-b497-cf789d916d64.aspx

John

[NY86]

Re: I am Baaack

How did you get a STC on a 74 incher without doing vibration analysis ...

Take a look at the prop TCDS. McCauley has already done the vibration analysis.