Ok heres what Ive got , Im hopeing someone can give me good info on what I need. Im in the process of buying a Bob Godfrey (precision Aviation Design) Ultimate Biplane, the plane has a 3w-80b2 twin (80cc) with smoke, total weight is 26 lbs, I want to use this plane not only for sport flying but also some 3 d flying, could anyone out there tell me what kind of props I need to get , and I will be in the process of striping this plane down for recover so maybe someone out there has some ideas on getting this bird a little lighter. Italsohas 4 TS160, 2 HS 5645MG, 2 S9303 and 1 148 servos along with battery backup and electronic kill switch, Please if theres anything else I need to do to this bird please by all means let me know , I want it to be right .and as light as I can get it . Thanks

Servos are bare minimum, but will fly 3D OK. If you are not doing rolling harriers. For props you are probably looking at a 26x10 thinner blade cut (xoar or so) or a 25x10. With that engine, at that weight, you are going to have a little trouble in the extreme 3D department, but it should get you by, for a while.

Good luck, post pictures when you can.

Ihave a DLE111was thinking aboutreplaceing the engine, but would rather if I could drop some weight somewhere during the recover process. Not real sure of whats under the covering as of yet and not sure I can save any weight at all, I prob will upgrade the servo's though , just in case.

Aileron TS-160 servos, if those are from towerhobbies are the same servo as hs5645's, just in a different package. They are fine for the ailerons. I would upgrade the elevator servos to TS-170 (hs5955)or hs7955. Rudder servos are ok, or you could put the 5645's there. That would be a good setup.

Sounds like a plann , Ive got plenty of room on my shoping list for this plane, so what ever it takes to make it right, keep the info flowing , Im sure I will need help with setup also , like throw rates so on, so on, Not to mention batery packs what kind , I know it sounds like I dont know anything about this and to a degreeI dont , 3D is a whole new ball game and I knowI want to play in it. Lollol

This is what she's gonna look like when Im done with her , so she's got to fly lol lol

Awesome scheme.

Personally, I run two 7.4V 2100mah Lipos on my 33%. I don't run a regulator. The 170's and 160's will handle the extra voltage, but I don't know about the 9303's. I have 170's on the ele's, 160's on everything else. When you run that voltage you need to be dang sure you don't have any binding.

A better recommendation would be 6.6V LifePo's Two 3200 packs should do it. You will need a charger for these and hobbyking.com has one that works quite well. I think Tower has some new 3200's out that would work great.

I also have been running two RX's and two switches, (right, Left) with rudder on right and throttle on left. Do not split ganged servos between receivers.

Don't think power expanders and regulators are worth it, just seems like something else that can fail.

I think that's all I have for now. Good Luck!

Im a bit confused about two switches and the 6.6 lifePo', I have one of those acuecycle elite chargers from hobbyco Im guessing that will charge the LifePo's, still a bit confussed about the set up your talking about , would it be to much to ask for a picture or Diagram or if you know where I can download it from the net , even better I have two rx's both 2.4 but havent a clue how to get them both in the set up , but will do it if showed or explained to me , like I said I want no corners cut on this plane as far as set up or anything else for that matter , are the LifePo's safe and lighter than the normal packs. As far as the servos go I will upgrade them if told what I need , I dont have a problem with that. The overall weight of the plane is 26 lbs , so Im thinking about changeing the engine from the 80cc to the DLE 111 I have new in the box , so that might take care of the weight problem right there. Im not real sure whats underneath the covering but fixing to find out in about two weeks when I start striping the covering off for a recover. But like I said I do not want to skimp on this plane , I fly better when I know It isall right.

acuecycle elete will not charge Lifepo's, you will need a different charger.
Setup is about a simple as it comes

Right side of plane
RX 1-right aileron
2-right elevator half
3- throttle
7- battery 1
Battery1
Switch1

Left side of plane
RX 6-left aileron
5-right elevator half
4-rudder
7- battery 2
Battery2
switch2

yep thats simple enough , and I will get both the bateries and the charger , Im guessing the ingnition can be on a regular battery, as used or should I feed that into a LifePo too.

Regular 4.8V Nimh at least 1500mah for the ignition, 1500 will give you about 5-6 flights.

This is the charger I was speaking of.
http://hobbyking.com/hobbyking/store...idProduct=7028

If it were me I wouldn't go making engine decisions until you get the plane.

First off you need to find out if the plane has any extra ballast in it for the CG. I have seen a few airplanes with weight either in the tail or in the nose to make it balance. If the plane has extra ballast in the tail you could use a lighter engine like the DLE111 or a DA85.

As far as servos go I would go with Hitec 7955 all the way around, the main reason I say that for the small price difference between the 7985 and the 7955 its not worth the worry. And you will always be able to use the 7955 in the next airplane they simply do not wear out.

The other place to save weight is in how you power it. I run (2) 1100 Mh A123 batteries on all my aircraft 500 cc to 100 cc

Both batteries have two sets of power leads and one balance connector. One 22ga lead with std. jr connector for Ignition and smoke pump and One 16 ga lead with a deans to a wolverine switch for the receiver. I use a 42% products opti kill and no switch for the ignition and no switch for the smoke pump. I get two flights and recharge and usually put between 650 and 800 Mh back in after 30 minutes of flying. They are quick to recharge and bullet proof.

Hope this helps,

Jim

Sounds like a plan, except that 2200 on 8-7955's seems a little small. I always use way too much battery though.

No problem go to 2 - 2300 Mh batteries at about 9 oz more if I remeber correctly.

1100mah-3oz
1800mah-4.6oz
2100mah-5oz
3200mah-7.4oz

Take your pick...

Is there a difference in Lifepo and Lipo Batteries, my acucycle elete sayswill charge Lithium-Polymeror li-lons and also NiCad or NiMHs, Ive charged my electric heli which is on lipo batteries . and it has a setting for them , just wondering if there is a difference is all

Lipo, Li-ion are 3.7V per cell. Meaning a 2s (2 cell) pack is 7.4V. LifePo are 3.3V per cell. Meaning a 2s pack is 6.6V.

If you charge a Lifepo like a lipo or li-ion you will over charge them and ruin them.

Thank you for clearing that up for me , I didnt know there was a difference.