Top Flite B-25 ARF (Tecnical, tips, suggestions)
05-28-2013, 06:02 AM
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
I used 14x6 blade props for my first engine run. I taxied around the field for 15 minutes and then spent 45 minutes pulling grass off my plane. I'm switching back to 13x8x3 blade props before my maiden flight. I'm running os 95v fs engines. Power is way more than I need! 
05-28-2013, 08:28 AM
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
UMITV, I'm in the process of switching to DLE 20's and would love to see how you mounted them. Pretty much have to carve out the middle of the firewall to get the carb through and concerned about how much strength is left and how to reinforce it.
Dave
Dave
05-28-2013, 08:33 AM
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
Just curious, but why dle-20s? If you want gas, why not go saito 91 gas or something similar? The plane was designed for an os 70fs and a dle is 1.20...that's a big jump! I think os 70 engines were around 1hp.
My 95v engines required zero added weight to the plane. I did use a bunch if electrical extras, but they are all right around CG. I'm curious how much tail weight the dle engines would require
My 95v engines required zero added weight to the plane. I did use a bunch if electrical extras, but they are all right around CG. I'm curious how much tail weight the dle engines would require
05-28-2013, 12:49 PM
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
Fidelity,
This might sound silly but I had a couple of NIB DLE-20's sitting in my workshop and I had to send both of my Saito 82's in for service so I was staring at the 2 DLE-20's and 2 empty firewalls and have a desire to convert from glow to gas. Agree that they are overkill for sure but I have them just sitting here.
Dave
This might sound silly but I had a couple of NIB DLE-20's sitting in my workshop and I had to send both of my Saito 82's in for service so I was staring at the 2 DLE-20's and 2 empty firewalls and have a desire to convert from glow to gas. Agree that they are overkill for sure but I have them just sitting here.
Dave
05-28-2013, 04:43 PM
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
I'll post pictures when I get home town back. Carbs just touch firewall. Because fuel tanks right behind firewall. And I put alot of epoxy on firewalls. They are too thin for these engines. Also I had to move battery pack from nose to cockpit. That's all. I have no problem so far.
ORIGINAL: djstar39
UMITV, I'm in the process of switching to DLE 20's and would love to see how you mounted them. Pretty much have to carve out the middle of the firewall to get the carb through and concerned about how much strength is left and how to reinforce it.
Dave
UMITV, I'm in the process of switching to DLE 20's and would love to see how you mounted them. Pretty much have to carve out the middle of the firewall to get the carb through and concerned about how much strength is left and how to reinforce it.
Dave
05-28-2013, 05:54 PM
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
ORIGINAL: Speedracer2112
I'm running OS81a's. Great little motors.
Speed
ORIGINAL: chris923
Speed,What kind of engines were you using? I am on my second TF B-25, the 1st one with OS 70 surpasses. The 2nd one with JBA 15 gassers.
Speed,What kind of engines were you using? I am on my second TF B-25, the 1st one with OS 70 surpasses. The 2nd one with JBA 15 gassers.
Speed
05-28-2013, 05:55 PM
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
ORIGINAL: umitv
Finally I replaced os .55's with dle 20's on my b-25. It flies great. Only problem is prop clearance. 14x9 3 blade prop only 1,5 inch from ground. I'll post some pictures
Finally I replaced os .55's with dle 20's on my b-25. It flies great. Only problem is prop clearance. 14x9 3 blade prop only 1,5 inch from ground. I'll post some pictures
05-29-2013, 04:50 AM
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
Umitv, do you remember which motor mounts you used? If your carb's are just touching your firewall, it would seem your prop is sticking out about an inch further forward. Did you modify your cowls?
As I was doing my measurements, it seemed that the carb would have to go through the firewall and use a smaller fuel tank to have the props about the right position in front of the cowls. I'm VERY interested in how you did yours as I can copy great designs with the best of them!
Dave
As I was doing my measurements, it seemed that the carb would have to go through the firewall and use a smaller fuel tank to have the props about the right position in front of the cowls. I'm VERY interested in how you did yours as I can copy great designs with the best of them!
Dave
05-29-2013, 04:52 AM
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
Umitv / Termites,
I'm in Fort Wayne... do you guys get to Indiana Warbirds in Muncie? I may have bumped into you in the past.
Dave
I'm in Fort Wayne... do you guys get to Indiana Warbirds in Muncie? I may have bumped into you in the past.
Dave
05-29-2013, 05:59 AM
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
David,
I don't fly b-25 offen. Yes we'll fly at Aeronuts. Also you should check hamilton county rc club. Usually fly up there. Jim Nance president now
I don't fly b-25 offen. Yes we'll fly at Aeronuts. Also you should check hamilton county rc club. Usually fly up there. Jim Nance president now
ORIGINAL: Termites Dream
Umit,
I didnt know you had a B-25. Mine is on its 5th season. You should bring yours out to Aeronuts sometime.
David G
Umit,
I didnt know you had a B-25. Mine is on its 5th season. You should bring yours out to Aeronuts sometime.
David G
05-29-2013, 06:06 AM
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
I used great planes motor mount large size. And i put some spacers on cowl. So cowl moved front for little bit. I think prop space is half inch and doesn't look bad. I'll post pictures tonight. I did as simple as I can. Most important part is reenforce firewall.
ORIGINAL: djstar39
Umitv, do you remember which motor mounts you used? If your carb's are just touching your firewall, it would seem your prop is sticking out about an inch further forward. Did you modify your cowls?
As I was doing my measurements, it seemed that the carb would have to go through the firewall and use a smaller fuel tank to have the props about the right position in front of the cowls. I'm VERY interested in how you did yours as I can copy great designs with the best of them!
Dave
Umitv, do you remember which motor mounts you used? If your carb's are just touching your firewall, it would seem your prop is sticking out about an inch further forward. Did you modify your cowls?
As I was doing my measurements, it seemed that the carb would have to go through the firewall and use a smaller fuel tank to have the props about the right position in front of the cowls. I'm VERY interested in how you did yours as I can copy great designs with the best of them!
Dave
05-29-2013, 07:48 AM
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
Thanks! When you get home, can you tell me if this is the one you used?
http://www3.towerhobbies.com/cgi-bin...&I=LXATG7&P=ML
If so, did it fit onto the firewall between the two formers that stick out?
Appreciate your help!!
Dave
http://www3.towerhobbies.com/cgi-bin...&I=LXATG7&P=ML
If so, did it fit onto the firewall between the two formers that stick out?
Appreciate your help!!
Dave
05-29-2013, 09:26 AM
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
YEs Dave I used this mount. You have to cut those formers that stick out. Be careful when you cut them. Because surface should be flat. Engine mount sits exactly where it is. Pictures will help you more than my bad english
ORIGINAL: djstar39
Thanks! When you get home, can you tell me if this is the one you used?
http://www3.towerhobbies.com/cgi-bin...&I=LXATG7&P=ML
If so, did it fit onto the firewall between the two formers that stick out?
Appreciate your help!!
Dave
Thanks! When you get home, can you tell me if this is the one you used?
http://www3.towerhobbies.com/cgi-bin...&I=LXATG7&P=ML
If so, did it fit onto the firewall between the two formers that stick out?
Appreciate your help!!
Dave
05-29-2013, 03:21 PM
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
ORIGINAL: chris923
OS81's?
ORIGINAL: Speedracer2112
I'm running OS81a's. Great little motors.
Speed
ORIGINAL: chris923
Speed,What kind of engines were you using? I am on my second TF B-25, the 1st one with OS 70 surpasses. The 2nd one with JBA 15 gassers.
Speed,What kind of engines were you using? I am on my second TF B-25, the 1st one with OS 70 surpasses. The 2nd one with JBA 15 gassers.
Speed
Speed
05-29-2013, 08:31 PM
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
Thanks Umit! Pictures are great and I appreciate the time you took to post them! Did you put the ignition switches up on the fuse by the nose or did you keep them on the nacelle? What did you use for spacers for the cowls?
Dave
Dave
05-29-2013, 08:38 PM
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
I use one ignition kill switch and connect to both ignition with y harnes cable ( but you have to convert plugs) and use one battery for both ignition. for spacers I use these little nuts.http://www.robart.com/products/air-line-retainer-nuts I found them in my tool box.
I found them in my tool box.
ORIGINAL: djstar39
Thanks Umit! Pictures are great and I appreciate the time you took to post them! Did you put the ignition switches up on the fuse by the nose or did you keep them on the nacelle? What did you use for spacers for the cowls?
Dave
Thanks Umit! Pictures are great and I appreciate the time you took to post them! Did you put the ignition switches up on the fuse by the nose or did you keep them on the nacelle? What did you use for spacers for the cowls?
Dave
05-30-2013, 05:00 AM
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
Cool! I have a bunch of those Robart nuts laying around. Will order the GP motor mounts and get started. Looks like you didn't go with the dummy radial engines in the front of the cowls...
Dave
Dave
05-30-2013, 03:24 PM
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
ORIGINAL: umitv
05-31-2013, 11:55 AM
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
Umitv,
Was just contemplating your ignition batter setup and had in my mind that I would have a separate switch and battery for each. But with your way, you save the weight of one battery and switch and if you have a battery or switch failure, both engines would die together. Hmmm, that's an interesting thought. But then Speed flew with one dead engine and landed just fine a couple of times if I remember correctly.
Dave
Was just contemplating your ignition batter setup and had in my mind that I would have a separate switch and battery for each. But with your way, you save the weight of one battery and switch and if you have a battery or switch failure, both engines would die together. Hmmm, that's an interesting thought. But then Speed flew with one dead engine and landed just fine a couple of times if I remember correctly.
Dave