Calling all Aerodynamicists !
#26

OK, link is fixed above and duplicated here also.
There's NO SOUND on the video. I have to figure out what I did wrong with the Microsoft video recorder software.
Portions of two flights are in the file. First was me on the sticks, second was my son Ian. The cross-wind on the second takeoff make it interesting...
Andy
Edit: Corrected link
There's NO SOUND on the video. I have to figure out what I did wrong with the Microsoft video recorder software.
Portions of two flights are in the file. First was me on the sticks, second was my son Ian. The cross-wind on the second takeoff make it interesting...
Andy
Edit: Corrected link
#27
Thread Starter

My Feedback: (3)
Andy, I'm going to check out that video later. Sounds interesting.
So it looks like there will be two Deceptions, a D10 and a D60, that will be built with a flat top wing as per Jim's instructions (we'll disregard those on the plans although I think the MAN plans give the right dimension for a flat top wing).
On another note, I've determined that in order to have the wing (and stab) incidence line parallel to the ground when resting on the gear, I'm going to have to move the FW forward by 3/8" (10 mm). This is in part due to the fact that I decided to use slightly larger main wheels than the equivalent 60 size would use (using 1-3/4 in instead of the scaled 1-1/2 in) and the mains layout is now fixed.
The additional 10 mm is the differential between the retractable gear rotation points (pivots) with the nose gear pivot sitting higher off the ground than the mains (4-1/8" nose & 3-3/4" mains). Per design, the model provides a 4" space in the nose gear bay, putting the pivot at 3-3/4", so an additional 3/8" will be required. Not wanting to modify the design of F2 and cut a notch into the belly pan and wing I've decided to move the FW forward.
This gives rise to a couple of questions:
[ul][*] How should the position of the CG be affected (if at all...) by this increased nose moment?[*] How will the increased nose moment impact the dynamics of the aircraft in flight?
[/ul]
I suspect that I'll end up putting the battery in the fuse just forward of the rearward servo quartet or, if necessary, just aft of F3 above the pushrods.
Looking forward to your comments guys!
Thanks, David.
So it looks like there will be two Deceptions, a D10 and a D60, that will be built with a flat top wing as per Jim's instructions (we'll disregard those on the plans although I think the MAN plans give the right dimension for a flat top wing).
On another note, I've determined that in order to have the wing (and stab) incidence line parallel to the ground when resting on the gear, I'm going to have to move the FW forward by 3/8" (10 mm). This is in part due to the fact that I decided to use slightly larger main wheels than the equivalent 60 size would use (using 1-3/4 in instead of the scaled 1-1/2 in) and the mains layout is now fixed.
The additional 10 mm is the differential between the retractable gear rotation points (pivots) with the nose gear pivot sitting higher off the ground than the mains (4-1/8" nose & 3-3/4" mains). Per design, the model provides a 4" space in the nose gear bay, putting the pivot at 3-3/4", so an additional 3/8" will be required. Not wanting to modify the design of F2 and cut a notch into the belly pan and wing I've decided to move the FW forward.
This gives rise to a couple of questions:
[ul][*] How should the position of the CG be affected (if at all...) by this increased nose moment?[*] How will the increased nose moment impact the dynamics of the aircraft in flight?
[/ul]
I suspect that I'll end up putting the battery in the fuse just forward of the rearward servo quartet or, if necessary, just aft of F3 above the pushrods.
Looking forward to your comments guys!
Thanks, David.
#28
Thread Starter

My Feedback: (3)
Andy,
that Gulfstream sure moves out! Maybe you might want to consider renaming it the Kuroshio!
It appears to be a very nice model - dihedral on stab to boot! I wonder what would happen if you were to simply take that stab, flip it, and mount it with anhedral. Inverted and knife edge would tell the story...
I look forward to hearing more about your design. I found Manzano Laser Works on the web. Seems to be a very nice outfit. If there's interest and she turns out to be a good flyer, maybe we'll short kit the D10 (with a quick line to Jim Kimbro beforehand to confirm his approval)!
BTW, what retracts would you use and/or recommend for the GS?
David.
that Gulfstream sure moves out! Maybe you might want to consider renaming it the Kuroshio!
It appears to be a very nice model - dihedral on stab to boot! I wonder what would happen if you were to simply take that stab, flip it, and mount it with anhedral. Inverted and knife edge would tell the story...
I look forward to hearing more about your design. I found Manzano Laser Works on the web. Seems to be a very nice outfit. If there's interest and she turns out to be a good flyer, maybe we'll short kit the D10 (with a quick line to Jim Kimbro beforehand to confirm his approval)!
BTW, what retracts would you use and/or recommend for the GS?
David.
#29

It's amazing how much power that motor has. That 6x4 isn't even pushing it too hard - I have flown the same motor with a 7x5 on other models.
I have E-Flite's F-15 retracts EFL7065 in mine. They are bigger than the micro Robarts but half the price and seem to work just fine. You have to do a little with a Dremel if you want to make the nose strut adjustable (actually, I have a long and a short leg to give -0.5 or +2.0 degree AoA) but other than that I have no complaints.
The first flight I didn't have enough rudder deflection to hold KE long (remember, it's from 1980!) but it wasn't needing much on the other controls to hold the edge - it just lost altitude too quickly. Each flight we are tweaking something. The last flights were to improve the roll rate. After the weather breaks I hope to get it out and push it harder. Right now it's just too windy and cold outside.
Andy
I have E-Flite's F-15 retracts EFL7065 in mine. They are bigger than the micro Robarts but half the price and seem to work just fine. You have to do a little with a Dremel if you want to make the nose strut adjustable (actually, I have a long and a short leg to give -0.5 or +2.0 degree AoA) but other than that I have no complaints.
The first flight I didn't have enough rudder deflection to hold KE long (remember, it's from 1980!) but it wasn't needing much on the other controls to hold the edge - it just lost altitude too quickly. Each flight we are tweaking something. The last flights were to improve the roll rate. After the weather breaks I hope to get it out and push it harder. Right now it's just too windy and cold outside.
Andy



