Hotspot c/g
 

I am putting together a hotspot and would like some help on the correct control throws and c/g point also any extra tips would be welcome.

RE: Hotspot c/g
 

The C.G. (dry) is 7 to 7 1/2 inches back along the leading edge of the wing measured from the outside of the fin assembly.

On my HS I had 1 1/2" elevator throw (as recommended by Bob Wilcox) and aileron throw set at 5/8" high rate and 7/16" low rate. My elevons at this CG had 3/8" up reflex. You need all the throw you can get on the rudders, I had about 20 degrees either side of center.

Barry

RE: Hotspot c/g
 

Also some expo would help... I use -25% on mine on elevator and aileron channel... 30% on rudder. I also mix the wheel breaks on down elevator, and the mix is desactivated when I pull
up the gear.

Regards, Enrique

RE: Hotspot c/g
 

Thanks, that's what I needed.

RE: Hotspot c/g
 

William:

If you don't want to balance on the wings, the original 1999 Liebetrau/Wilcox instructions for the HS were 5 1/4-5 1/2" back from the leading edge of the wing root on the fuselage.......comes out to the identical spot measured on the wings......

My current old HS with 250 flights or so on it is at 4 3/4" back from the leading edge.....I do snaps, inverted spins, and hovers, and you need it that far forward to get the nose to drop out of a flat spin......

Barry's throws are what I have been using as well.... but on high rate, to get a smoking roll rate, I use 3/4" aileron with 40% expo to soften the center.....

Be sure to glass the fins.....I used 1 oz cloth......I also added another 1/4" doubler plywood block and a 3 mm C/F plate for the nose gear plate, with generous triangular hardwood gussets to the sidewalls....I fly off grass, and the HS, like Roo's can get a hopping, and it is much easier to beef up rather than repair a torn out gear plate.....the main gear plates on the newer kits have been beefed quite solidly.....I use Robart 630 retracts with Robart struts and BVM wheels/brakes..

I have my RX battery, a lithium, up front, lateral to the gear well, with my airtanks up in the nose.... and a lithium ECU pack tie-wrapped to the aft bulkhead, just in front of the gear blocks......

All 3 of my Spots have used 8411's, one on each elevon, and the tiny Volz Wing-Maxx servos for the rudders.....definitely no need to split the elevons and use 4 servos like some guys have done, IMO.....

Tom

RE: Hotspot c/g
 

Hi William

Remember 6-8mm(1/4") reflex(up elevator) is normal on the Hotspot. The Hotspot is a real clean airframe so try and slow it down plenty on the downwind leg.

Regards

Zane

RE: Hotspot c/g
 

Tom, what do you mean by this ?(If you don't want to balance on the wings) also it looks like the c/g is right on the mains, does this sound correct?.

RE: Hotspot c/g
 

William:

I usually balance by suspending the model fore and aft and then plumb bobbing the C.G.......from a practical standpoint, it is easier to mark the C.G. on the fuse.....the mark on the wings is convenient if you just want to pick the plane up with a finger and see which way the nose tips.....both marks are co-incident, so it's a fielder's choice....

C.G. is close to the mains......if you pop off the canopy, Hotspots will readily sit down on their tails with just a tap on the nose.....


Happy Thanksgiving....


Tom

RE: Hotspot c/g
 

Ok, now I understand!! what I did was flipped her on her back and measured 7" to 7.5" on the wings and it was right in line with the gear so I hung her from the cealing by the main gear structure.

RE: Hotspot c/g
 

OH, sorry I forgot what today was, to mee it's a paid jet build day with the bonus of the wife cooking extra good stuff!! HAPPY THANKSGIVING TO ALL!!! :)

RE: Hotspot c/g
 

Foster4U, perhaps this drawing could help you to find the proper CG in your HS...

Rgds, Enrique

RE: Hotspot c/g
 

That did it, now she's hanging fine. Thanks again.