Thank you.....

[imsofaman]

Thanks for all of the guys on this forum who have a tremendous amount of knowledge and share it willingly. Many of theese posts have helped me and I hope I inturn have helped you guys also.
Started a new homepage about my RC plane stuff. Feel free to visit!

Dave

http://home.att.net/~imsofaman/dave_surace_rc_homepage.htm

[Dave Robelen]

Hi Dave,
Thanks for the link. It apears you have caught the spirit of this board right on the money. Sharing a hobby is a terrific thing.
Regards, Dave

[imsofaman]

Because of a reply from Jaybird, I figured out my control rods were flexing! That was just the info that I needed to solve my problem. I put my Speedy Bee in the air with cofidence today. It is a real blast to fly! I may have to go with a smaller prop ( I have an 8 X 6 on it now.) but with the same pitch. I may want to go with a 7 X 6 if they make that. It has so much speed now that it is too touchy at full throttle. When I go half or quarter throttle she is mild and floats like a butterfly. I staightened out the thrust line so I think that is not an issue. I have heard that too large of a prop can cause too much turbulence off of the wing effecting the performance of the elevator. Is that true my enegineering friend? If anyone wold know it is you. Suggestions?
I will sum it up.......too much speed she is jumpy....but it was gusty today so I need to try it on a clam day. When she slows down, she is very docile. I

I added more stuff to my page, hit refresh when you open it to bring up the changes. Still working on it.

Dave

[Dave Robelen]

Hi Dave,
The pitch of the prop is very closely linked to the airspeed. If you wish to slow down, but keep a reasonable load on the motor, an 8-4 would probably be a suitable solution. The 7-6 is most likely available, but mounting it will raise the RPM's at the same pitch, and probably increase the airspeed a bit more still. Much of this depends on the drag characteristics of the specific model, so a bit of testing with several props is a very useful thing. I found a pitch of 4" adequate for a number of original models of this general sort in bygone days.
As for the prop dia. influencing the wing turbulence over the tail, all I can contribute there is that I have never seen or heard of any literature that would support that line of thought. Again, reducing the pitch will reduce the slipstream velocity, and that would reduce the airspeed at the tail, which might be the solution that you are seeking.
Regards, Dave

[imsofaman]

Dave,
I guess what I need to do is ge comftable with Speedy Bee. Flying in gusty weather is not the brightest idea I have had. I had an 8X4 on her before but did not not have enough speed to do a barrel roll easily. The tail would wash out. Looked like a duck flopping araound. With the added speed, she whipps out a barrell rool in line without a hitch. I have to realize that this is not a Cap or an Extra so extreme stunts are not exactly what she is made for. I will try extra speed for the stunts only...Barrell rolls and the knife eges. I added an exhaust with aluminum pipe to keep the oil off the plane. I took out the cone baffle to reduce some of the back preasure that the pipe creates. Works out nice!

Dave

[Dave Robelen]

Hi Dave,
It sounds like you are on the right track. Considering that the "Bee" series were not laid out as aerobatic hot shots, you are probably getting all you can with the 6" pitch. Since the transmitter has a throttle, that is probably the most suitable way to get what you are seeking from your Bee. Many models can be safely "overpowered" at full throttle as long as the pilot makes good use of the throttle as a flight control.
Regards, Dave

[imsofaman]

You know what Dave?........I figured out something today. At half to quarter thrattle, she floats like a bird. Any higher she wants to dive a little. Up and down I go like on the ocean. So I think my thrust line need a little more attention. Did not have time to re adjust the motor. I will let you know how it goes.

Dave

[Dave Robelen]

Hi Dave,
The thrust line may be the culprit, but it is also possible that she is just a bit tailheavy. The conditions you describe would apply to that as well. Before you go after the thrustline, try this little number. Trim it for level flight at high power, and then cut to an idle. If the nose rises, or you sense the "f;oating" condition, I would toss a little weight in the nose and retrim. I try to shoot for a setup that has the nose very slowly dropping to a steady glide as I go from full speed to idle. This can be the thrust line, but unless the offsets are really gross, the effect of small changes in the thrust line are hard to notice once airspeed builds up.
Regards, Dave

[imsofaman]

I will try this weekend Dave.....thanks!

[imsofaman]

Dave,
You are da' man!!!!!!! I placed my battery pack, after three or four different positions, to the nose of the plane. Wow....what a difference. No more up and down stuff. Rock solid, inverted no problem, wide open speed without a hitch. Thanks so much for the advise! This page is one of the best things I have ever been part of.

Dave

:p