John W

Need help finding any literature pertaining to rebuild of HAPI 75 Magnum engine, and sources for parts. Have book “Engine Assembly Manual” by Steve Bennett. Looking for Top end gasket kit, Rings, and Valves, etc. Tried contacting Grate Plains Aircraft but they must really be busy as getting no response. My local VW guru tells me HAPI must have used special valves as he can not locate. Looks as if engine has very low hours but has valve damage, most likely from running hot. Can not find any postings on this topic - or did I overlook?? Any insight into rebuilding this engine appreciated. Thanks

Anthony P. I Do not have spare front wing. I am using my original MK-l canard after removing outer gear pants. I am in process of converting to Hoop gear using Dave Divincenzo plans as shown in DBFN issue 43. Have one BIG QUESTION maybe you or someone can answer. Dave's glass gear is 4 inches by 5/8 thick across top and ends, and uses layers of 3" wide rolls of "E" glass, .025 thick. Does he overlap the 3" strips inside the mold by one and one half inch to end up with 4 inch?? If so, I don't believe it will be flat on top due to overlap. This would make it impossible to mount without patching a flat area where the bolts mount the gear to fuselage. Or does he cut 3" strips in half, to gain a 4" wide leg?

Thinking about power coating all the metal control linkage parts made from 4130 steel or aluminum. I think this may give better rust/corrosion control than Zink chromite. Have any of you tried this and what were your results? Only comment I could find on powder coating was in DBFN 82, page 4, but mostly referred to landing gear and motor mounts. I am primarily interested in the feasibility of using power coating on the small rods and linkage between stick and elevator/ailerons, as they are not yet installed.

Looking for help in choosing engine and landing gear for Dragonfly. Just COMPLEETED reading and indexing all 128 issues of Dragonfly newsletters. Thanks to Pat Panzera for link to the DBFN files. Also, thanks to Ray Parker for allowing me to visit his flying DF at Butler Co. Airport in Ohio. Big help. After many years of barn storage, I now feel I am somewhat more knowledgeable and ready to dive head on into completion. One thing for sure, the more I learn, the more I realize how much I don’t know. My partners and I have decided to go from M-1 to MK-3 because only one of us is proficient with tail dragger. So, my first question is: What are you guy’s using for nose gear. I am aware DB-5 nose gear being used but think it may be a little weak?? Second question: The Corvair engine was just becoming popular in Dragonfly when last DBFN newsletter was published. The mod-4 VW engine would be a good choice but thinking the Corvair may start with a more solid build. Also, is my assumption correct that a six cylinder would run with a little less vibration. Have any significant issues occurred with the Corvair conversions I need to be aware of? P.S. Just now found the “Powerplant” section in forums. Will be reading as I wait response. Thanks

I have similar situation. Looking for complete copies of all Dragonfly newsletters so I can restart my dragonfly project. Any help appreciated. jwietlisba@nalu.net Thanks geeksville.com does not appear to have any valid or current links to DF newsletters. Any other ideas I may try? I am sending email to Patrick Panzera at ContactMagazine to see if available there.