Official Freewing Twin 70mm AL37 Airliner Thread

[salali]

Has anyone upgraded the stock motors with the FMS Pro 70's?

[GliderGuy]

So there is no confusion….

She flies better when the CG is on the mark. I am sure many fly her with the CG aft of the mark.

Not so good with the CG forward of the mark.

-GG

[f4u ausie]

Thanku so much for prompt help.... yes my battery is aft looking but on cg 185 mm the orange batt is wes i thought to farrwrd.. thats why i was confused,, again thanx

[GliderGuy]

One more thing….

6) Install RF chokes. Remove the battery tray to do this. You can put them on both ends of the ESCs, but the forward end is more important.

If you plan on flying her a lot, wing skin cracking is minimized by epoxying in 1/4 inch carbon square rods into the wing channels. Remove the nacelles and invert the wing and epoxy a long rod to the top skin inside the wiring channel. You’ll have to hold it while it cures.

Elect not to do this, and you will get top skin foam cell boundary cracks eventually.

-GG

[GliderGuy]

Hi f4u, Chimimg in….

I use the Admiral 6000 as well. Not saying she won’t fly with your “forward” battery placement, but I don’t think you will like the handling. I have had one AL37 with a more forward CG, but not happy with it.

About 1/3 of my battery sits on the bump/carry through that your aft end sits against. If it were my bird, I’d move the battery back and get the CG on the mark. I measured wheels down and right side up.

1) Adjust the elevator up about 3 mm with the stick neutral.
2) No flap elevator mix.
3) INSTALL a gyro with gain about 60%.
4) Low rates at first….then settle on high rate
5) Keep a touch of power on to help the flare and touchdown.


Good looking bird….have fun!

-GG

[f4u ausie]

Woopsy

[f4u ausie]

Its warming up and im itchen 4 maiden,, still waiting 4 callie roos( my fault) have cg thoughts..... 2 pics of bat location.. one cleary mine... the other is wesley,,, at that time helping motion..... old pic.. both 6000 mine is hrb 50c,, and is mayb 5 mm forward of the 185 recommended... question is the descepancy in position... the motian pic is 3 years or therabout is there a change in internal weight etc on the newer plane possibly the easier question is the cg mark good,, one last cg question is do i measure it right side up or down.... appears to make no diiff...... kinda hopen glider guy chimes in,, seems the man on this foamie,,, b safe all

[njberardi1@gmail.com]

Can someone tell me how to set up the nose wheel so it turns
Had to take the wiring out and can't figure out how to setup the nose gear so it turns
i have a spectrum AR 8360T receiver

[f4u ausie]

LOOKING FOR SOME HELP TEAM FIRST PLANE 4 ME WITH THROTTE AND UBEC WIRE.. SO THROTTLE IS INTO RECEIVER AND UBEC INTO BLUEBOX,, NOT SURE IF THATS CORRECT

[Icarus the 2nd]

Here's a video showing the P.8 Poseidon from my friend Robert, recorded at last weekend's EDF meeting in Wey, Germany.

[themudduck]

I am having trouble taking off from grass runway. Not getting enough speed. Using 5500 45c roaring top battery. Any suggestions.

Grass creates a lot of drag against the wheels. Cut that stuff down as close as you can. My suggestion is to take off with the flaps at takeoff setting, that will help get it off the ground quicker. Also, you may be nose heavy. If you move the battery back a little it will also help the model take off faster, but make sure you don't make it tail heavy. Move it back just a little, like 1/2" at a time and see how it goes. I take mine off from short grass without any problems at all.

[ridgerunner]

... The bird just recently sold out. ... I'm now on a quest.

@jasmith41
Looks to me like both versions are in stock $500

Freewing AL37 Airliner Base White Twin 70mm EDF Jet - PNP
Freewing AL37 Airliner Twin 70mm EDF Jet - PNP

[Jade5233]

I am having trouble taking off from grass runway. Not getting enough speed. Using 5500 45c roaring top battery. Any suggestions.

[jasmith41]

I always liked the way PanAm logo airplanes looked, they were around when I was younger. Go for it!

The bird just recently sold out. I was looking at it last week and thinking I better pull the trigger on it soon or it will be gone...

I'm now on a quest.

[GliderGuy]

Good deal. Yes…about 30 degrees max.

-GG

[jrf]

Thanks GG. I am using a gyro at 50% gain and that works well. Also, my neutral setting on the elevators is about the same as yours. I was a little nose heavy and have now moved the CG to the marks. Are you using the recommended 10mm / 19mm travel on the flaps? That works out to only 30 degrees or so..

[GliderGuy]

I am new to this forum and new to the AL37. If this question has been discussed in the past, maybe someone can point me to the relevant pages. My test flying seems to show the need for some down elevator with flaps to keep the nose down on approach, but I see that the manual calls for UP elevator. What are most flyers using?

Welcome JRF,
You should read the posts in this forum to take advantage of all the knowledge here.

Double check your CG. I have owned 3 AL37 planes, and they remain level when the flaps are lowered and raised. If a “little” flap and elevator mixing is needed in your transmitter, that’s not a big problem.

Strongly suggest you add a gyro. She flies a lot better with one. Also, add a little expo on the ailerons (20 to 30%) to settle her roll sensitivity a bit.

To give you an example, I fly on the CG mark with a gyro and 30% aileron expo and yesterday I made 10 flights in 15 to 20 knot wind gusts. She did fine!

With neutral stick, my elevator sits about 2 mm up. I fly with Admiral 6000 and also the SMC 6200 type batteries. Lighter batteries will lead to a more aft CG.

Keep about 4 clicks of power on approach with full flaps for a smoother controlled approach and landing.

Also search the forums on RF chokes….READ, LEARN, INSTALL them.

-GG

[jrf]

I am new to this forum and new to the AL37. If this question has been discussed in the past, maybe someone can point me to the relevant pages. My test flying seems to show the need for some down elevator with flaps to keep the nose down on approach, but I see that the manual calls for UP elevator. What are most flyers using?

[Spad Driver]

Got it on my list as a must do.👍
motion rc brings us good quality airframes, but almost every rc bird can use upgrades and improvements. Especially ones that are flown hard and have their limits pushed!.
Do appreciate the advice though, glider guy!.
FEDEX says delivery tomorrow!. Then it's Christmas all over again!.
gotta do my happy dance!.

[GliderGuy]

Hi Spad Driver,
Additional evidence regarding upper wing skin reinforcement with 1/4 inch square carbon tubing epoxied to the top skin inside the wing wiring channels.

Both wing photos were taken after a LARGE number (several thousand) of flights…and I do aerobatics.

Photo above is my current bird. Photo below is my RETIRED first bird (paint didn’t match after an attempted cosmetic fix).

The need for extra internal carbon is self evident, if you plan on flying her a lot and doing aerobatics.

It’s an EASY mod and well worth doing.

-GG