Alpha 2.0M build "log" (mostly questions)

[Konrad]

Place horn as you show so that the pivot is on the hinge line, square to the rudder chord.

Cut rudder to clear upper part of horn. Trim torsion arm to fit inside rudder skins. Sand side of horn and install in rudder with a lot of epoxy and cab-o-sil. Make nice fillet on outside skin to arm.

 

[Luis94]

Hello,,
Im building the electric version...
Need some advice on how much throw
Up - Down Elevator should it have for maiden flight..?

 

[gnichola]

I haven't gotten mine up yet so I will be of no help, sorry...maybe someone else will have an answer

 

[Doc James Hammond]

RCRCM TYPHOON 2M INSTRUCTION MANUAL Pdf Download | ManualsLib

Doc.

 

[Konrad]

Per the manual (see post #2) +-10mm for the elevator measured at the widest part of the trailing edge.

As with most cruciform tails I like to get as much rudder as I can and not stall the servo. I’m usually happy with +-45°

 

[Doc James Hammond]

Its an elevator, Konrad - not an airbrake.

Now for the rudder...at the top of this big stall turns...

Doc.

 

[Konrad]

I’m assuming this is for the maiden, too nose heavy. Later as the GC is moved aft the elevator throw can be cut down to get that smooth graceful control we all love so much.

 

[Luis94]

Hello everyone,,
My Alpha is almost ready...just need to Finish the radio setup and C.G .

 

[Doc James Hammond]

This model seems to have a really strange finish, judging by the close-up pics. The fuselage/fin area has been changed a little from the original too. I have never seen a JIRC model in the flesh so to speak, but I guess like RCRCM you get what you pay for.

Apart from the 'vinyl roof' finish and the visibly massive mould seam line, it seems not too bad.

Doc.

 

[Luis94]

Here is the Build Log...

E-Alpha 2.0m Build ..!!!

Hello everyone just want to share some pics of my E-Alpha 2.0m Build The Quality of this model is top of the line and very well priced. For electronics im using Corona Digital wing servos and mini for Rudder. Emaxx Digital 17g for Elevator Neumotor 1107/2.6D/6.7 P29 gear drive Jetti ESC...

forum.alofthobbies.com

 

[gnichola]

I have just finished this model...looking back I see it only took me 3 years to complete! Not bad
Anyway, I used Mike Schellim's radio template and have it setup basically per the Typhoon manual I was directed to. What I noticed in there was that I think it is saying I want full wing ailerons (wrong terminology) with the flaps moving a bit more than the ailerons. Am I reading this correctly? Is this a somewhat normal practice?

 

[Red]

I have just finished this model...looking back I see it only took me 3 years to complete! Not bad
Anyway, I used Mike Schellim's radio template and have it setup basically per the Typhoon manual I was directed to. What I noticed in there was that I think it is saying I want full wing ailerons (wrong terminology) with the flaps moving a bit more than the ailerons. Am I reading this correctly? Is this a somewhat normal practice?
View attachment 19056

Normally when mixing flaps with ailerons, the flap travel is less than the aileron. Does this mean 8mm total, 4mm each way?

 

[Doc J]

I have just finished this model...looking back I see it only took me 3 years to complete! Not bad
Anyway, I used Mike Schellim's radio template and have it setup basically per the Typhoon manual I was directed to. What I noticed in there was that I think it is saying I want full wing ailerons (wrong terminology) with the flaps moving a bit more than the ailerons. Am I reading this correctly? Is this a somewhat normal practice?
View attachment 19056

Its not my design, but the flaps need to be moving less than the ailerons. Aileon travel seems too small.

How about landing?

No instructions?

Doc.

 

[Wayne]

I usually have the flaps follow the ailerons at about 50% give or take. I put this on a switch and play with it during the first flights to see what feels good. Many planes can not move the flaps up very much,so be careful, don't want to break things.

 

[gnichola]

The directions I found have @Doc J name on them (I don't know how close the Alpha is to the Typhoon) https://sansibear.de/wp-content/uploads/2015/04/Typhoon-instruction-Manual.pdf?v=3a52f3c22ed6
I should have posted the whole page with all the measurements, here it is:

@Red it would seem they are indicating 8mm in each direction.

 

[Doc J]

The directions I found have @Doc J name on them (I don't know how close the Alpha is to the Typhoon) https://sansibear.de/wp-content/uploads/2015/04/Typhoon-instruction-Manual.pdf?v=3a52f3c22ed6
I should have posted the whole page with all the measurements, here it is:

View attachment 19069

@Red it would seem they are indicating 8mm in each direction.

Hi Nick - well that's quite a while ago. You called the model "Alpha" though, not Typhoon?? Who makes the Alpha anyway?

I remember TJIRC politely asked me if I had any objections to them copying the Typhoon when they started up, and I basically replied: go ahead, dudes, make my day. I think they called the copy a "Dream" - is that right?

As for copies, the 60" Magnus is basically a pretty much direct copy of the Genesis I designed too - although that has had several different names - with the only real difference being the the wing chopped in two to make left and right panels. I'm pretty sure TJIRC didn't know that when they paid for the design, though.

Since the Typhoon was and still is (After over a decade) their biggest seller, RCRCM have tried to milk it as much as possible by taking the fuselages and using those on other models - I think Sansibear in Germany still use my fuselages on some of their planes, but again Henning Schmidt was polite and asked me first. Then they use the wings for yet another model etc etc. They seem to think the design has some magic, like holy relics etc, like the "the toenail clippings of Saint Whatnot" "the tailplane of the Typhoon" Actully its like a jigsaw where the pieces dont quite fit.

I can tell you though that the aileron settings as written there are not what I would have put, and are not correct. Thats more like a DS setup. But then RCRCM altered quite a lot of things on my designs.

Cheers,

Doc.

 

[Red]

The directions I found have @Doc J name on them (I don't know how close the Alpha is to the Typhoon) https://sansibear.de/wp-content/uploads/2015/04/Typhoon-instruction-Manual.pdf?v=3a52f3c22ed6
I should have posted the whole page with all the measurements, here it is:

View attachment 19069

@Red it would seem they are indicating 8mm in each direction.

I would simply have the flaps follow about 50%, tweak it to suit your taste. I can help you dial it in at Sunset if you like.

 

[gnichola]

Thanks for the response @Doc J The aircraft is a TJIRC Alpha 2.0, and I only called it a Typhoon as in one of my early posts in this thread I asked if there was a manual for it, and I was told it was the same as the Typhoon. The instructions I linked to above are basically the same instructions I found in numerous places with the only difference in that particular link, being you on the cover photo (that is you isn't it?)
Anyway, as to my maiden setup, I will turn up the aileron travel some, and drop my flaps to 50% or so of the aileron travel.
One last question. There is a round "bump" on the front of the rudder that the elevator travels over as seen in the images below. I am trying to make a guess to "center" as the center on the slot and the center on the bump are not the same. Currently I have chosen center of bump as the 10mm travel suggested sort of matches "bump travel". I would like to avoid big surprises on my maiden so I am thinking that I could check the incidence at my current center. My question is what should I be looking for at center? 1-2 deg?

 

[gnichola]

I would simply have the flaps follow about 50%, tweak it to suit your taste. I can help you dial it in at Sunset if you like.

I was hoping to "man up" and try to maiden this one by myself..Lichau, not Goat

 

[Red]

I was hoping to "man up" and try to maiden this one by myself..Lichau, not Goat

No reason not to maiden it, go for it. It's not going to crash because the throws aren't perfect. The place where it will snow up is adverse yaw and you might want some extra roll rate. No different than just using ailerons alone.