1. Where is the best place to mount the
pitot tube?
Usually we mount the pedo tube in the front of the aircraft. See photos
below.- back to top
2. Should I have an inspection hole in the fin fabric for the top elevator cable pulley where it comes out of the body tube?
Yes, we provide you with an inspection cover and ring in order to be able to properly inspect the elevator cable. It is part of the assembly process.- back
to top
3. What empty weights have you seen on previous 912 Chinooks?
Answer: The average empty weight of the 912 Chinook on wheels is about 510-525lbs but this can differ based on any extra accessories a customer may opt to install. The Chinook 912 prefers the weight up front of the aircraft due to the extra weight of the engine and so generally speaking if two people are flying, the heavier person should be in the front seat. Normally you can allow about a 40 lb difference from front to back, meaning if your pilot up front is 200 lbs then the passenger should be no more then 240 lbs. To offset some of the weight issues on the 912, you can opt to put the battery in the front nose area. The 912 and HKS body tube are also 3” longer which allows, if necessary, the movement of the front seat up by 3”. All of this was done for weight and balance reasons. If the front pilot is more then 40 lbs lighter then the rear passenger, then extra weight may be required to offset the weight difference.- back to top
4. Do you supply a straight front control stick?
No. Both the front and back control sticks are curved. You could make your own by cutting the curved one, and adding a straight piece to be connected by a collar or insert to the original bottom one.- back to top
5. Is there supposed to be an eyebolt on the rear joystick?
No. The front eyebolt is for the elevator cable hook up. See Page 60 in the manual.- back to top
6. What options do I have when my front seat full up elevator stick position is tight against the seat and I can’t get it all the way back to get my full 27 degrees up elevator deflection?
Hopefully you can move your seat a little and still be good with your center of gravity. If not, you will have to get a new 7-9 that does not have a hole in it and re-drill your elevator.- back to top
7. Can I replace a body tube and tail of the Chinook WT 2S with one from WT single seat?
No. The body tubes are not interchangeable. The lengths are different and the brackets that are on the tube itself are different. The sleeving is also different. To change engines to a 447 the engine mount needs to be changed and the rear post will need
sleeving.- back to top
8. How come my 8-028XS push-pull tube appears to be too long and causes my rear stick to bottom out in the full up elevator position?
Both sticks need to be hooked up before you do your elevator drilling. To get full movement now you will have to take the plug out of the 8-028XS and re-rivet. - back to top
9. I am noting substantially more resistance in the lateral stick movement than the fore-aft. Is this normal?
If you are flying with some flaps on then you will have more stick pressure- back to top
10. Can I drill the second hole through the struts and attach the tube before the wings are put on?
No. This has to be done on the plane because sometimes the 5-03 are not exactly straight in the strut and the hole needs to be drilled in the middle of the 5-03. Refer to Page 72.-
back to top
11. What is the best way to put the bolts on the Chinook?
Standard practice is to go left to right - front to back and top to bottom.
There are some exceptions to this rule in places that require clearance.
Diagram 4A
· All the bolts go front to back except the AN3-20A.
· The AN3-20A goes in from the back so at a later step you can attach the 2-333x3 brace.
Diagram 8A
· All the bolts go left to right. It will be easier to do an inspection of all your bolts if you only have to look on one side.
Diagram 11A
· All the bolts go left to right.
Diagram 5A
· The AN3-16A goes front to back.
· The AN4-17A has to go from the back to the front so that 2-220 will fit.
Diagram 7A
· All the bolts go left to right.
Diagram 9A
· All the bolts go left to right.
Wing Rear Spar Attach Bolt
· This one goes from the back to the front so that the aileron will not rub against the nut.
Rear Strut Attach Bolt
· This goes through the washout adjuster (5-17). This has to go from back to front so when you hook up your aileron and let it hang down (until you attach your 17-1 control rod) you do not puncture a hole through your fabric.
Rear Jury Strut (5-08)
· The top bolt on the rear jury strut has to go from back to front. -back to top
12. What is the best or recommended way to deal with gussets that are interfering with the ribs?
On the gusset make sure that it is flat against the spar. You can just lightly pound it flat with a hammer. On the rib, it is ok to take a little material off just where the plastic meets the tube.- back to top
13. What parts from the existing tail are used in the wing conversion for an old 2 place Chinook?
Leading edge for rudder and elevator (6-1, 7-1)
6-2
(4) BSPQ-64 rivets for the 6-2
(3) 6-14 plugs
(6) AD46H rivets for 6-14 plugs
(2) 7-15
(2) 7-7
(4) 7-8
(24) AD42H rivets for the 7-8- back to top
14. Why is my rudder tube 2” too long and what do I need to do to complete the tail conversion?
When we changed the tail wheel to an air filled tire, the tail sat higher so we shortened the rudder from 52 inches to 50 inches. The best way to find out what rudder post you need is to look at the 6-04 (short) or the 6-4 (long). These two collars are different lengths. If the collar is only one inch long then you can cut the bottom of the rudder off two inches. Cut the bottom of the rudder not the top. The two are the same except for the total length. Re-drill the 3/16 hole on the bottom using the collar as a guide.- back to top
15. What can I do about the pulleys binding and the rudder cables not turning easily?
The pulley should turn easily in the 1-19 guide. If it does not, ream the pulley out with a 1/4" drill bit. The bolt that goes through the 1-19 should also move freely. Make sure that the corners of the 1-14 guide do not dig into the pulleys. This should not happen if the 1-19 is long enough and just snug up the bolt.- back to top
16. Where exactly do I position the 2-032 pylon side braces?
Measure 26 1/4" from the end of the 2-221 to the back of the 2-032. Make sure when you put your 5-02
T.E. Strut on there is room and it does not rub. You will have to do some trimming to fit flat on the boom tube. See
pictures below.- back to top
17. What can I do when the AN3-45 bolt seems too long and interferes with the rivets on the 8-02 and the 1-02’s in Step 29?
Either file the head of the rivet down a little or if you have enough bolt length use a 3/16 washer to give you more clearance.- back to top
18. Where does the 912-3 plate with the cut-out off centre go?
Put the offset to the right side.- back to top
19. What torque is required to tighten the barry mount bolts in Step 13 of the engine mount instructions?
We don’t have any torque lbs. Just crank them tight. We have not had any come loose.- back to top
20. What can I do to loosen the rudder?
The rudder will get tight if you oblong the rudder by tightening the 6-9 horn bolt too much or the 6-04 collar bolt. Use WD-40 for a lube or a greaseless silicone lube. Note any lube will collect dirt and grim so try the bolt problem first.- back to top
21. What is the best way to set the ailerons?
When setting your ailerons make sure that the 8-014 is all the way to the front of the plane (this means that the slot in the 8-014 is forward). Put a straight edge on the bottom of the wing and have your ailerons in the neutral position (stick in the middle). With the straight edge on the bottom of the wing you should have 1/2 inch up from straight edge to the bottom of the trailing edge of the aileron. Make sure that both ailerons are the same when the stick is in the middle and you will not have the stick off to one side when flying.- back to top
22. Would you advise installing any drain or vent grommets in the wing as I live in a damp climate on the coast?
We have not really needed them anywhere else, but suggest you put some in the ailerons, rudder and elevator.- back to top
23. Should I use a 2-28 bushing inside the root tube for the rear wing spar attachment?
The load on the TE wing is nowhere as high as the LE. It will not hurt if you want to put one in.- back to top
24. Where do the hinges attach on the doors?
The hinges get mounted through the lexan and the frame. Use a longer 1/8 rivet.- back to top
25. Is there anything I should wait on in building the main aircraft before I put the wings on?
You can put everything together except the front doors. You have to have the wings on before you can fit the front doors to make sure that when they open that they will not rub up on the inside of the wings.- back to top
26. What is the difference between all the channels?
2-38 channels have 1/4" holes in them. The 2-23 channels have 3/16" holes. The 2-23A channels are bent at an angle. Do not mix them up with each other. - back to top
27. How come the diagrams in the manual have extra parts attached?
Some drawings in the manual have been used in a few different places in the manual so they may have a few extra parts on them that will be done in a later
step. We suggest you first read through the entire manual to see how the plane and the steps go together. - back to top
28. Question: How do I adjust the position of the pilot seat when it is inclined too far backwards?
There are two options.
1. Make a foam wedge to put in between the seat and the seat cover.
2. Use the rubber grommets that we use for the Beaver, part # 2523. You might have to put some cut down ones on the front bolts to support the seat better.- back to top
29. Where do I set the flaperon lever in the cockpit using the notch adjustments?
Answer: Set it one to two back from the center notch. This is all pilot preference. There are enough notches to adjust for more forward or back. NOTE: Do not use more than one notch of flap above 55mph. The setting for the flaps at cruise should be set so that the trailing edge of the aileron is 1/2 inch higher than the bottom of the wing.
- back to top
Well, we hope that we have clarified a few of your
questions. If you do require additional assistance, we would be very happy to hear from
you with your questions, comments or concerns.
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