wildbills21

Not 100 % sure if it's the spinner or the motor. I have flown my albi without the spinner and the motor still thumps pretty good. My prop is balanced but not the spinner. I am going to have my prop and spinner together. We'll see. Mark from Balsa and I have been working to figure this out.

Wild Bill

ALbert.S

I am using the DLE85 motor It has a a shock mount so my fire wall is back farther because the carb does not go through the fire wall
My firewall is without a hole so you would think it would be stronger BUT so far the Muffler has come loose twice made a extra strap to fix that The four bolts holding the center of wing loose the fake engine loose the two straps holding cowl on fatigued and broke The engine came loose also I have used locktite on muffler and bolts but no help

wildbills21

I hear ya there, I built the prototype BUSA Albi. I spent the better part of two weeks this winter going through everything on that plane. Three flights this year and I need to replace the entire firewall. Every plane goes through it's growing pains. This problem will be resolved. Like is rated earlier I am getting the prop and spinner balanced together. Will let everybody know what's going on.

wild bill

FokkerD7

My Feedback: (5)

Wildbill,on your da85 do you have all the mods DA recommends. To find out get your s/n off the motor and call them. The firsy thing the will ask for it that. I think there is 2 or 3 updates sofar.

Albert. S on the muffler problem your having, remove the muffler, clean oil off and put JB weld around the port enough to make a gasket then bolt it back on. Let it sent overnight. This will help the coming loose and leak problems. Just a trying to help guys.

jeffo

My Feedback: (68)

Wildbill,
I've got the kit,will there be a mod. for this problem,or do you think it's a balancing issue.jeffo

flyboy077

any one think this will work on a spinner this big? seams to indicate a heavy side. would have to drill holes on back side of back plate to balance

pettit

My Feedback: (23)

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pettit

My Feedback: (23)

Ran my DLE-85 today. 5800 RPM with a 27-10 prop. It idles at 1200 (yep, 1200 Rpm!)

I modified my vibration mount, basically bypassing the rubber grommets. Little vibration at idle, but none at full speed.

Question: Anyone that has flown their Albi: What is a good CG to begin with? Mine balances at about 5 1/4" behind LE of top wing with ZERO added weight to balance. Total dry weight is right at 34 pounds and the DLE provides 37 pounds of pull at full power.

Film at 11......

wildbills21

FokkerD7,

no I do not have the updates, motor Is 3 years old and did not know there where any updates. I will call them on Mon. Everybody has there favorite brand of motor, being a WWII guy and do not need the power, I am a zenoah guy. If I could get one of my 74 or 80 twins to fit without hacking it all up I would be running one of those in my albi right now. Too be perfectly honest with you I think a G-62 would fly this bird. This would eliminate motor vibration.

wild bill

FireBee

My Feedback: (34)

FokerD7, Congrats on you maiden. Great to see she flew "right off the building board". Love the color scheme.

Flyboy077, yes that is exactly how to do a big spinner. And agree drill holes to lighten the heavy side. Once all done, do again with the prop and spinner together. If not just do both separate. I bet that green striped fuse will really show nice in the air. Good luck.

vertical grimmace

My Feedback: (1)

That is a big displacement for a single cylinder gas engine. Future builders may consider a twin cylinder. after 7 years, I just re-installed the firewall in my 1/4 BUSA DVII. The fix for me after re-gluing the old one back in, I added a secondary firewall, that carried all the way down to the floor plate. This added 3 gluing surfaces. I added hardwood tri stock to both sides of all the 3 joints, and also bamboo skewered the firewall through the fuselage sides. I now have a 1/2" thick firewall, as I put in a new 55cc engine. I am so much happier with this plane now with this engine. Got 3 flights on it last monday. The ability to spin the large prop, at low throttle settings is like night and day. It had a G38 in there. Just not enough in my opinion. Good luck with your engine mount issues.

wildbills21

I'll ask it here and also on the gas engine forum, would it be an issue to run a 74 or 80 twin vertically. Would to top cylinder be lean and the bottom rich.

wild bill

flyboy077

firebee thanks It should look really good in the air. I'm holding off on maiden flight to see how all these problems are being resolved. myself I'm balancing the prop tips & hub and the spinner.
Question for anybody, I'm running a 3w 80 on my albi with the spinner back plate & the prop on, the prop shaft does not stick all the way thru the prop so the thrust washer doesn't go on the prop shaft. does any body think thats a problem. I don't believe it is. But worth questioning. I have a da85 on my DVII this is my 3rd year flying with no structural problems.

FokkerD7

My Feedback: (5)

Flyboy077 i think if your using the mounting plate for the front of prop .

FokkerD7

My Feedback: (5)

Just thinking bout this, does your motor run lean doing knife edge flight

FokkerD7

My Feedback: (5)

Vg just picked up a 1/4 D7, I was thinking g38. Was it speed or vertical you were missing on the g38?

vertical grimmace

My Feedback: (1)

It just did not climb well. These airplanes really want the disc of a larger prop. I bet the G38 with a gear drive would work great. Keep in mind the scale diameter of the prop would be 32". I was running a 19" and now with the 55cc, I can run a 23". I have flown my DVII quite a bit over the last 7 years. MY last 3 flights, on monday, were like night and day. It is a different plane. The ailerons are more effective, where before they were anemic at best. A classic Immelman turn could rarely be executed. A 50cc may seem like a lot of engine, but I never used full throttle. It was the large prop and torque that my plane wanted. Now having accurate numbers, my weight is at 24lbs., and I fly at 5'000' of altitude. Think about it, what engine would you put in an 88" , 24lb. biplane? Not a G38. Maybe a G45

wildbills21

Flyboy077,
it's the same on the DA85, The shaft does not go all the way through. Will keep everybody posted what's going on.

wild bill

cocobear

My Feedback: (2)

I flew one (1/4 DVII)for years on a US 41, slightly less than a G38. I found the prop to be critical. a Master Air Screw Scimitar 20-8 was like a super charger compared to anything else. Wid Bill, I have flown mine forever on a single 64 Fuji. Loops no issue from level. BTW, my buddy Shawn started flying his 1/3rd DVII on a ZDZ .80 inline and it goes great. The DVII comes out quite a bit heavier and draggyer (???) than the Albi.

Dave

FokkerD7

My Feedback: (5)

Cbear I'm going with the g38 for the 1/4 D7. A couple around here needs a home. Do you have a motor for the 1/3 FokkerdVll you might want to get reed of? Call me

cocobear

My Feedback: (2)

I do and will.

Dave

flyboy077

balanced the spinner today drilled in to back plate with 1/4 drill 8 times to relieve some metal. also balanced prop both the tips and the hub.also put a 1/4x1" plywood on top of the firewall to the fwd cabane block reenforced with 1" triangle stock down both sides the firewall leaving the center open for access to the carb hopefully that helps with vibration and reenforcement.

FireBee

My Feedback: (34)

FokkerD7, a buddy of mine has BUSA D-7 with G-38. Flies "scale" and does most of flight at full throttle. He has to dive a little to build up speed to do a loop. Excellent choice and very reliable engine. I have 3, one in my 1/4 scale N-28. Awesome as it weighs less than a typical D-7.

My 1/4 scale D-7 has a Brison 3.2 (52cc) with a 28-6 Xoar. Mine was really heavy before the diet of recovering as it had 4 paint schemes and a few repairs.
Extra power allows pretty large loop and I don't need to dive her to start the loop or rolls. I fly at reduced throttle at 40-50% most of flight. But I have the power to fly inverted for 300 yards (pisses off our true Fokker fans) and I can fly away from any combat and reposition easily with a longer vertical before a stall turn back into the fight.

FireBee

My Feedback: (34)

Flyboy077, not sure I follow on DA-85 and prop washer question. Is it like one of the cases?

1. Engine shaft, spinner back plate, prop, prop washer, nut.
(safety nut if spinner is held on by side screws.). If not a true turn spinner adaptor nut is used for spinner screw.

2. If spinner nut is a true turn which tightens on prop/prop shaft, then the spinner screw goes into that, you should be ok as well
If prop is wood you can tighten nut enough to indent it and it should be ok. Not so with a CArbon Fiber prop as that will need a prop washer.
After 3 flights I check and tighten prop, spinner again.

I do have a DA-85 for future spitfire project so I can measure the shaft length.

pettit

My Feedback: (23)

Flew my Albi this morning. Two very successful flights and then the weather started to warm up. Elevator and rudder very responsive, ailerons not so much. I flew the first flight and Rick made the video.

Rick tried a slow roll and with full aileron it took almost 10 seconds. But it looked pretty!

You'll see I was having to add up trim because the nose wanted to stay pointed down. Lots of porpoising. Used all the up trim and will adjust at home.

Here's the YouTube video link. Photos will follow on Monday


http://www.youtube.com/watch?v=ugadr...OVPP536xV0m3Kg